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19-1221; Rev 3; 8/01
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown
General Description
The MAX4180 family of current-feedback amplifiers combines high-speed performance, low distortion, and excellent video specifications with ultra-low-power operation in miniature packages. They operate from 2.25V to 5.5V dual supplies, or from a single +5V supply. They require only 1mA of supply current per amplifier while delivering up to 60mA of output current drive. The MAX4180/MAX4182/MAX4183/MAX4186 are compensated for applications with a closed-loop gain of +2 (6dB) or greater, and provide a -3dB bandwidth of 240MHz and a 0.1dB bandwidth of 70MHz. The MAX4181/MAX4184/MAX4185/MAX4187 are compensated for applications with a +1 (0dB) or greater gain, and provide a -3dB bandwidth of 270MHz and a 0.1dB bandwidth of 60MHz. The MAX4180-MAX4187 feature 0.08%/0.03 differential gain and phase errors, a 20ns settling time to 0.1%, and a 450V/s slew rate, making them ideal for highperformance video applications. The MAX4180/ MAX4181/MAX4183/MAX4185 have a low-power shutdown mode that reduces power-supply current to 135A and places the outputs in a high-impedance state. This feature makes them ideal for multiplexing applications. The single MAX4180/MAX4181 are offered in spacesaving 6-pin SOT23 packages.
Features
o Ultra-Low Supply Current: 1mA per Amplifier o Shutdown Mode Outputs Placed in High-Z Supply Current Reduced to 135A o Operate from a Single +5V Supply or Dual 5V Supplies o Wide Bandwidth 270MHz -3dB Small-Signal Bandwidth (MAX4181/MAX4184/MAX4185/MAX4187) o 450V/s Slew Rate o Fast, 20ns Settling Time to 0.1% o Excellent Video Specifications Gain Flatness to 70MHz (MAX4180/MAX4182/MAX4183/MAX4186) 0.08%/0.03 Differential Gain/Phase o Low Distortion: -73dBc SFDR (fC = 5MHz, VOUT = 2Vp-p) o Available in Tiny Surface-Mount Packages 6-Pin SOT23 (MAX4180/MAX4181) 10-Pin MAX (MAX4183/MAX4185) 16-Pin QSOP (MAX4186/MAX4187)
MAX4180-MAX4187
________________________Applications
Portable/Battery-Powered Video/Multimedia Systems Broadcast and High-Definition TV Systems High-Speed A/D Buffers CCD Imaging Systems Medical Imaging High-Definition Surveillance Video Professional Cameras Video Switching/ Multiplexing
PART MAX4180EUT-T MAX4180ESA
Ordering Information
TEMP RANGE -40C to +85C -40C to +85C PINPACKAGE 6 SOT23-6 8 SO TOP MARK AAAB --
Ordering Information continued at end of data sheet.
Pin Configurations Selector Guide
TOP VIEW SINGLE
OUT 1 6 VCC
PART MAX4180 MAX4181 MAX4182 MAX4183 MAX4184 MAX4185 MAX4186 MAX4187
NO. OF AMPS 1 1 2 2 2 2 4 4
SHUTDOWN MODE Yes Yes No Yes No Yes No No
OPTIMIZED FOR AV 2 AV 1 AV 2 AV 2 AV 1 AV 1 AV 2 AV 1
VEE 2
MAX4180 MAX4181
5
SHDN
IN+ 3
4
IN-
SOT23-6 Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
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Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown MAX4180-MAX4187
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE) .................................................12V Analog Input Voltage.......................(VEE - 0.3V) to (VCC + 0.3V) Differential Input Voltage.......................................................2V SHDN Input Voltage ........................(VEE - 0.3V) to (VCC + 0.3V) Short-Circuit Duration (OUT to GND, VCC or VEE).....Continuous Continuous Power Dissipation (TA = +70C) 6-Pin SOT23 (derate 7.10mW/C above +70C)...........571mW 8-Pin SO (derate 5.88mW/C above +70C).................471mW 10-Pin MAX (derate 5.60mW/C above +70C) ..........444mW 14-Pin SO (derate 8.33mW/C above +70C)...............667mW 16-Pin QSOP (derate 8.30mW/C above +70C)..........667mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS--Dual Supplies
(VCC = +5V, VEE = -5V, VIN+ = 0, SHDN 3V; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER Input Voltage Range Input Offset Voltage Input Offset-Voltage Drift Input Offset-Voltage Matching Input Bias Current (Positive Input) Input Bias Current (Negative Input) Input Resistance (Positive Input) Input Resistance (Negative Input) Common-Mode Rejection Ratio Open-Loop Transresistance IB+ IBRIN+ RINCMRR TR -3.6V VCM 3.6V RL = 1k, VOUT = 3.6V RL = 150, VOUT = 2.5V RL = 1k Output Voltage Swing Output Current Output Short-Circuit Current Output Resistance Disabled Output Leakage Current SHDN Logic Low Threshold SHDN Logic High Threshold VSW IOUT ISC ROUT IOUT(OFF) VIL VIH SHDN VIL, VOUT 3V (Notes 2, 4) (Notes 3, 4) (Notes 3, 4) VCC - 2.0 RL = 150 RL = 100 RL = 30 32 -50 0.8 0.3 3.75 3.0 -3.6V VIN+ 3.6V, -1V (VIN+ - VIN-) 1V 250 SYMBOL VCM VOS TCVOS MAX4182-MAX4187 VCM = 0 CONDITIONS Guaranteed by CMRR test MIN 3.6 TYP 3.9 1.5 12 1 1 1 800 160 -58 3.0 0.9 4.0 3.3 3.0 60 80 0.2 0.1 6.0 VCC - 3.0 mA mA A V V V 7 12 7 MAX UNITS V mV V/C mV A A k dB M
2
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TOP VIEW
SING
OUT 1
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown
DC ELECTRICAL CHARACTERISTICS--Dual Supplies (continued)
(VCC = +5V, VEE = -5V, VIN+ = 0, SHDN 3V; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER SHDN Logic Input Bias Current Positive Power-Supply Rejection Ratio Negative Power-Supply Rejection Ratio Operating Supply Voltage Quiescent Supply Current per Amplifier Shutdown Supply Current per Amplifier SYMBOL IIN PSRR+ CONDITIONS VEE SHDN VCC (Note 4) VEE = -5V, VCC = 4.5V to 5.5V VCC = 5V, VEE = -4.5V to -5.5V 60 MIN TYP 0.1 71 MAX 2.0 UNITS A dB
MAX4180-MAX4187
PSRRVCC/VEE IS IS(OFF)
53 2.25
62 5.50 1.0 1.0 135 1.3 1.2 180
dB V mA A
RL =
MAX418_EUT All other packages
SHDN = 0, RL = (Note 4)
DC ELECTRICAL CHARACTERISTICS--Single Supply
(VCC = +5V, VEE = 0, VIN+ = 2.5V, SHDN 3V, RL to VCC/2; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER Input Voltage Range Input Offset Voltage Input Offset Voltage Drift Input Offset Voltage Matching Input Bias Current (Positive Input) Input Bias Current (Negative Input) Input Resistance (Positive Input) Input Resistance (Negative Input) Common-Mode Rejection Ratio Open-Loop Transresistance IB+ IBRIN+ RINCMRR TR 1.3V VCM 3.7V RL = 1k, VOUT = 1.2V to 3.8V RL = 150, VOUT = 1.4V to 3.6V RL = 1k Output Voltage Swing VSW RL = 150 RL = 100 -50 0.8 0.275 1.15 to 3.85 1.35 to 3.65 1.3V VIN+ 3.7V, -1V (VIN+ - VIN-) 1V 250 SYMBOL VCM VOS TCVOS MAX4182-MAX4187 VCM = 2.5V CONDITIONS MIN 1.3 to 3.7 TYP 1.1 to 3.9 1.5 12 1 1 1 800 160 -58 2.5 0.9 1.0 to 4.0 1.2 to 3.8 1.3 to 3.7 7 12 7 MAX UNITS V mV V/C mV A A k dB M
V V
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3
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown MAX4180-MAX4187
DC ELECTRICAL CHARACTERISTICS--Single Supply (continued)
(VCC = +5V, VEE = 0, VIN+ = 2.5V, SHDN 3V, RL to VCC/2; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER Output Current Output Short-Circuit Current Output Resistance Disabled Output Leakage Current SHDN Logic-Low Threshold SHDN Logic-High Threshold SHDN Logic Input Bias Current Power-Supply Rejection Ratio Operating Supply Voltage Quiescent Supply Current per Amplifier Shutdown Supply Current per Amplifier SYMBOL IOUT ISC ROUT IOUT(OFF) VIL VIH IIN PSRR VCC IS IS(OFF) RL = MAX418_EUT All other packages SHDN VIL, 1.2V VOUT 3.8V (Notes 2, 4) (Notes 3, 4) (Notes 3, 4) 0 SHDN VCC (Note 4) VCC = 4.5V to 5.5V 60 4.5 1.0 1.0 135 VCC 2.0
0.1 2.0
CONDITIONS RL = 30
MIN 18
TYP 30 50 0.2 0.1
MAX
UNITS mA mA
4.0 VCC 3.0
A V V A dB V mA A
71 5.5 1.25 1.2 180
SHDN = 0, RL = (Note 4)
AC ELECTRICAL CHARACTERISTICS--Dual Supplies (MAX4180/4182/4183/4186)
(VCC = +5V, VEE = -5V, VIN = 0, SHDN 3V, AV = +2V/V; see Table 1 for RF and RG values; TA = +25C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth (Note 5) Large-Signal -3dB Bandwidth Bandwidth for 0.1dB Flatness (Note 5) Slew Rate (Note 5) Settling Time to 0.1% Rise/Fall Time Spurious-Free Dynamic Range Second Harmonic Distortion Third Harmonic Distortion SYMBOL BWSS BWLS BW0.1dB SR tS tR, tF SFDR CONDITIONS <0.5dB peaking VOUT = 2Vp-p, RL = 1k RL = 1k RL = 150 VOUT = 2V step, RL = 1k VOUT = 2V step, RL = 1k VOUT = 2V step, RL = 1k fC = 5MHz, VOUT = 2Vp-p fC = 5MHz, VOUT = 2Vp-p fC = 5MHz, VOUT = 2Vp-p RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 Rising edge Falling edge 340 315 30 RL=1k RL=150 MIN 180 TYP 245 190 150 70 70 450 420 20 5 73 57 -83 -68 -73 -57 MAX UNITS MHz MHz MHz V/s ns ns dBc dBc dBc
4
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Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown
AC ELECTRICAL CHARACTERISTICS--Dual Supplies (MAX4180/4182/4183/4186) (cont.)
(VCC = +5V, VEE = -5V, VIN = 0, SHDN 3V, AV = +2V/V; see Table 1 for RF and RG values; TA = +25C, unless otherwise noted.) PARAMETER Differential Phase Error Differential Gain Error Input Noise-Voltage Density Input Noise-Current Density Input Capacitance (Positive Input) Output Impedance Disabled Output Capacitance Turn-On Time from SHDN Turn-Off Time to SHDN Power-Up Time Off-Isolation Crosstalk Gain Matching to 0.1dB SHDN 2V, RL = 150, f = 10MHz f = 10MHz, MAX4182/4183/4186 f = 10MHz, MAX4182/4183/4186 SYMBOL DP DG en in CIN+ ZOUT COUT(OFF) tON tOFF f = 10kHz SHDN VIL, VOUT 3V (Notes 2, 4) (Note 4) (Note 4) NTSC NTSC f = 10kHz f = 10kHz IN+ INCONDITIONS RL = 1k RL = 150 RL = 1k RL = 150 MIN TYP 0.03 0.30 0.08 0.01 2 4 5 1.5 4.8 4 40 400 200 -60 -60 25 MAX UNITS degrees % nV/Hz pA/Hz pF pF ns ns s dB dB MHz
MAX4180-MAX4187
AC ELECTRICAL CHARACTERISTICS--Dual Supplies (MAX4181/4184/4185/4187)
(VCC = +5V, VEE = -5V, VIN+ = 0, SHDN 3V, AV = +1V/V; see Table 1 for RF values; TA = +25C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth (Note 5) Large-Signal -3dB Bandwidth Bandwidth for 0.1dB Flatness (Note 5) Slew Rate (Note 5) Settling Time to 0.1% Rise/Fall Time Spurious-Free Dynamic Range Second Harmonic Distortion Third Harmonic Distortion Differential Phase Error DP SYMBOL BWSS BWLS BW0.1dB SR tS tR and tF SFDR CONDITIONS <0.5dB peaking VOUT = 2Vp-p, RL = 1k RL = 1k RL = 150 VOUT = 2V step, RL = 1k VOUT = 2V step, RL = 1k VOUT = 2V step, RL = 1k fC = 5MHz, VOUT = 2Vp-p fC = 5MHz, VOUT = 2Vp-p fC = 5MHz, VOUT = 2Vp-p NTSC RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 Rising edge Falling edge 250 200 20 RL = 1k RL = 150 MIN 195 TYP 270 205 90 60 55 320 265 21 5 57 66 -70 -73 -57 -66 0.01 0.48 MAX UNITS MHz MHz MHz V/s ns ns dB dB dB degrees
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5
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown MAX4180-MAX4187
AC ELECTRICAL CHARACTERISTICS--Dual Supplies (MAX4181/4184/4185/4187) (cont.)
(VCC = +5V, VEE = -5V, VIN+ = 0, SHDN 3V, AV = +1V/V; see Table 1 for RF values; TA = +25C, unless otherwise noted.) PARAMETER Differential Gain Error Input Noise-Voltage Density Input Noise-Current Density Input Capacitance (Positive Input) Output Impedance Disabled Output Capacitance Turn-On Time from SHDN Turn-Off Time to SHDN Power-Up Time Off-Isolation Crosstalk Gain Matching to 0.1dB SHDN 2V, RL = 150, f = 10MHz f = 10MHz, MAX4184/MAX4185/MAX4187 f = 10MHz, MAX4184/MAX4185/MAX4187 SYMBOL DG en in CIN+ ZOUT COUT(OFF) tON tOFF f = 10kHz SHDN VIL, VOUT 3V (Notes 2, 4) (Note 4) (Note 4) NTSC f = 10kHz f = 10kHz IN+ INCONDITIONS RL = 1k RL = 150 MIN TYP 0.09 0.16 2 4 5 1.5 4.8 4 50 400 200 -54 -60 25 MAX UNITS % nV/Hz pA/Hz pF pF ns ns s dB dB MHz
AC ELECTRICAL CHARACTERISTICS--Single Supply (MAX4180/4182/4183/4186)
(VCC = +5V, VEE = 0, VIN+ = 2.5V, SHDN 3V, AV = +2V/V; see Table 1 for RF and RG values; TA = +25C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth (Note 5) Large-Signal -3dB Bandwidth Bandwidth for 0.1dB Flatness (Note 5) Slew Rate (Note 5) Settling Time to 0.1% Rise/Fall Time Spurious-Free Dynamic Range Second Harmonic Distortion Third Harmonic Distortion Differential Phase Error DP SYMBOL BWSS BWLS BW0.1dB SR tS tR and tF SFDR CONDITIONS <0.5dB peaking VOUT = 2Vp-p, RL = 1k RL = 1k RL = 150 VOUT = 2V step, RL = 1k VOUT = 2V step, RL = 1k VOUT = 2V step, RL = 1k fC = 5MHz, VOUT = 2Vp-p fC = 5MHz, VOUT = 2Vp-p fC = 5MHz, VOUT = 2Vp-p NTSC RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 Rising edge Falling edge 260 220 20 RL = 1k RL = 150 MIN 155 TYP 210 165 110 50 40 340 300 20 6 72 57 -80 -76 -72 -57 0.01 0.35 MAX UNITS MHz MHz MHz V/s ns ns dB dBc dBc degrees
6
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Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown
AC ELECTRICAL CHARACTERISTICS--Single Supply (MAX4180/4182/4183/4186) (cont.)
(VCC = +5V, VEE = 0, VIN+ = 2.5V, SHDN 3V, AV = +2V/V; see Table 1 for RF and RG values; TA = +25C, unless otherwise noted.) PARAMETER Differential Gain Error Input Noise-Voltage Density Input Noise-Current Density Input Capacitance (Positive Input) Output Impedance Disabled Output Capacitance Turn-On Time from SHDN Turn-Off Time to SHDN Power-Up Time Off-Isolation Crosstalk Gain Matching to 0.1dB SHDN 2V, RL = 150, f = 10MHz f = 10MHz, MAX4182/MAX4183/MAX4186 f = 10MHz, MAX4182/MAX4183/MAX4186 SYMBOL DG en in CIN+ ZOUT COUT(OFF) tON tOFF f = 10kHz SHDN VIL, 1.2V VOUT 3.8V (Notes 2, 4) (Note 4) (Note 4) NTSC f = 10kHz f = 10kHz IN+ INCONDITIONS RL= 1k RL= 150 MIN TYP 0.10 0.03 2 4 5 1.5 4.8 4 40 400 200 -60 -60 25 MAX UNITS % nV/Hz pA/Hz pF pF ns ns s dB dB MHz
MAX4180-MAX4187
AC ELECTRICAL CHARACTERISTICS--Single Supply (MAX4181/4184/4185/4187)
(VCC = +5V, VEE = 0, VIN+ = 2.5V, SHDN 3V, AV = +1V/V; see Table 1 for RF values; TA = +25C, unless otherwise noted.) PARAMETER Small-Signal -3dB Bandwidth (Note 5) Large-Signal -3dB Bandwidth Bandwidth for 0.1dB Flatness (Note 5) Slew Rate (Note 5) Settling Time to 0.1% Rise/Fall Time Spurious-Free Dynamic Range Second Harmonic Distortion Third Harmonic Distortion Differential Phase Error DP SYMBOL BWSS BWLS BW0.1dB SR tS tR and tF SFDR CONDITIONS <0.5dB peaking VOUT = 2Vp-p, RL = 1k RL = 1k RL = 150 VOUT = 2V step, RL = 1k VOUT = 2V step, RL = 1k VOUT = 2V step, RL = 1k fC = 5MHz, VOUT = 2Vp-p fC = 5MHz, VOUT = 2Vp-p fC = 5MHz, VOUT = 2Vp-p NTSC RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 RL = 1k RL = 150 Rising edge Falling edge 210 170 16 RL = 1k RL = 150 MIN 175 TYP 220 170 110 40 30 275 215 22 7 55 59 -61 -72 -55 -59 0.01 0.35 MAX UNITS MHz MHz MHz V/s ns ns dB dBc dBc degrees
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7
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown MAX4180-MAX4187
AC ELECTRICAL CHARACTERISTICS--Single Supply (MAX4181/4184/4185/4187) (cont.)
(VCC = +5V, VEE = 0, VIN+ = 2.5V, SHDN 3V, AV = +1V/V; see Table 1 for RF values; TA = +25C, unless otherwise noted.) PARAMETER Differential Gain Error Input Noise-Voltage Density Input Noise-Current Density Input Capacitance (Positive Input) Output Impedance Disabled Output Capacitance Turn-On Time from SHDN Turn-Off Time to SHDN Power-Up Time Off-Isolation Crosstalk Gain Matching to 0.1dB SHDN 2V, RL = 150, f = 10MHz f = 10MHz, MAX4184/MAX4185/MAX4187 f = 10MHz, MAX4184/MAX4185/MAX4187 SYMBOL DG en in CIN+ ZOUT tON tOFF f = 10kHz (Note 4) (Note 4) NTSC f = 10kHz f = 10kHz IN+ INCONDITIONS RL= 1k RL= 150 MIN TYP 0.10 0.03 2 4 5 1.5 4.8 4 40 400 200 -54 -60 25 MAX UNITS % nV/Hz pA/Hz pF pF ns ns s dB dB MHz
COUT(OFF) SHDN VIL, 1.2V VOUT 3.8V (Notes 2, 4)
Note 1: The MAX418_EUT is 100% production tested at TA = +25C. Specifications over temperature limits are guaranteed by design. Note 2: Does not include current into the external-feedback network. Note 3: Over operating supply-voltage range. Note 4: Specification applies to MAX4180/MAX4181/MAX4183 and MAX4185. Note 5: The AC specifications shown are not measured in a production test environment. The minimum AC specifications given are based on the combination of worst-case design simulations along with a sample characterization of units. These minimum specifications are for design guidance only and are not intended to guarantee AC performance (see AC Testing/Performance). For 100% testing of those parameters, contact the factory.
__________________________________________Typical Operating Characteristics
(VCC = +5V, VEE = -5V, TA = +25C, unless otherwise noted.)
MAX4180 SMALL-SIGNAL GAIN vs. FREQUENCY (DUAL SUPPLIES)
MAX1480-87 TOCA
MAX4180 SMALL-SIGNAL GAIN vs. FREQUENCY (SINGLE SUPPLY)
MAX1480-87 TOCB
MAX4181 SMALL-SIGNAL GAIN vs. FREQUENCY (DUAL SUPPLIES)
3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 RF = 1k RL = 150 OR RF = 560 RL = 100 1 10 100 1000 RF = 2.4k RL = 1k VIN = 20mVp-p AV = +1V/V
MAX1480-87 TOCD
TOP VIEW SING
OUT 1
4 3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 1 10 100 RF = RG = 680 RL = 100 OR RF = RG = 820 RL = 150 VIN = 20mVp-p AV = +2V/V RF = RG = 1.2k RL = 1k
4 3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 RF = RG = 680 RL = 100 OR RF = RG = 820 RL = 150 VCC = +5V VIN = 20mVp-p AV = +2V/V
4
RF = RG = 1.2k RL = 1k
1000
1
10
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
8
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Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, TA = +25C, unless otherwise noted.)
MAX4180-MAX4187
MAX4181 SMALL-SIGNAL GAIN vs. FREQUENCY (SINGLE SUPPLY)
3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 1 10 100 1000 FREQUENCY (MHz) RF = 1k RL = 150 OR RF = 560 RL = 100 VCC = +5V VIN = 20mVp-p AV = +1V/V RF = 2.4k RL = 1k
MAX1480-87 TOCE
MAX4182/MAX4183 SMALL-SIGNAL GAIN vs. FREQUENCY (DUAL SUPPLIES)
MAX4180-87AA
MAX4184/MAX4185 SMALL-SIGNAL GAIN vs. FREQUENCY (DUAL SUPPLIES)
3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 RF = 750 RL = 150 RF = 620 RL = 100 VS = 5V VIN = 20mVp-p AV = +1V/V
MAX4180-87BB
4
4 3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 1 10 100 RF = RG = 680 RL = 150 RF = RG = 620 RL = 100 VS = 5V VIN = 20mVp-p AV = +2V/V
4 RF = 1.5k RL = 1k
RF = RG = 1k
1000
1
10
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX4186 SMALL-SIGNAL GAIN vs. FREQUENCY (DUAL SUPPLIES)
MAX4180-87CC
MAX4187 SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4180-87DD
MAX4180 GAIN FLATNESS vs. FREQUENCY (SINGLE & DUAL SUPPLIES)
0.3 0.2 0.1 GAIN (dB) 0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 VCC = +5V RF = RG = 1.2k RL = 1k VS = 5V RF = RG = 820 RL = 150 VCC = +5V RF = RG = 820k RL = 150 VIN = 20mVp-p AV = +2V/V 1 10 100 1000 FREQUENCY (MHz) VS = 5V RF = RG = 1.2k RL = 1k
MAX1480-87 TOCF MAX1480-87 TOCK
2 1 NORMALIZED GAIN (dB) 0
VS = 5V VIN = 20mVp-p AV = +2V/V
RF = RG = 1.1k RL = 1k
4 3 2 1 VS = 5V VIN = 20mVp-p AV = +1V/V RF = 1.6k RL = 1k
0.4
-2 -3 -4 -5 -6 1
RF = RG = 750 RL = 150
GAIN (dB)
-1
0 -1 -2 -3 RF = 680 RL = 100 RF = 910 RL = 150
RF = RG = 680 RL = 100
-4 -5 -6
10
100
1000
1
10
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX4181 GAIN FLATNESS vs. FREQUENCY (SINGLE & DUAL SUPPLIES)
MAX1480-87 TOCH
MAX4180 LARGE-SIGNAL GAIN vs. FREQUENCY (DUAL SUPPLIES)
3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 RF = RG = 1.2k RL = 1k OR RF = RG = 820 RL = 150 AV = +2V/V VOUT = 2Vp-p
MAX1480-87 TOCJ
MAX4180 LARGE-SIGNAL GAIN vs. FREQUENCY (SINGLE SUPPLY)
4 3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 RF = RG = 820 RL = 150 VOUT = 2Vp-p OR RF = RG = 1.2k RL = 1k VOUT = 2Vp-p 1 10 100 1000 VCC = +5V AV = +2V/V VOUT = 1Vp-p RF = RG = 680 RL = 100
0.4 0.3 0.2 0.1 GAIN (dB) 0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 1 10 100 VIN = 20mVp-p AV = +1V/V VS = 5V RF = 2.4k RL = 1k VS = 5V RF = 1k RL = 150 VCC = +5V RF = 1k RL = 150
4
VCC = +5V RF = 2.4k RL = 1k
-5 -6 1000 1
10
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
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9
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown MAX4180-MAX4187
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, TA = +25C, unless otherwise noted.)
MAX4180 SMALL-SIGNAL GAIN vs. FREQUENCY
MAX1480-87 TOCL
MAX4181 LARGE-SIGNAL GAIN vs. FREQUENCY (DUAL SUPPLIES)
MAX1480-87 TOCM
MAX4181 LARGE-SIGNAL GAIN vs. FREQUENCY (SINGLE SUPPLY)
3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 VOUT = 2Vp-p RF = 1k RL = 150 OR VOUT = 2Vp-p RF = 2.4k RL = 1k 1 10 100 1000 VCC = +5V AV = +1V/V VOUT = 1Vp-p RF = 560 RL = 100
MA480-87 TOCN
4 3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 1 10 100 AV = +10V/V RF = 750 RG = 82 VS = 5V VIN = 20mVp-p RL = 1k AV = +5V/V RF = 910 RG = 220
4 3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 VOUT = 2Vp-p RF = 2.4k RL = 1k OR VOUT = 2Vp-p RF = 1k RL = 150 1 10 100 VOUT = 1Vp-p RF = 560 RL = 100 AV = +1V/V
4
1000
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX4182 CROSSTALK vs. FREQUENCY
MAX4180-87EE
MAX4184 CROSSTALK vs. FREQUENCY
-30 -40 CROSSTALK (dB) -50 -60 -70 -80 -90 -100 -110 -120 RF = 750 RL = 150 VOUTB = 2Vp-p VOUTA MEASURED AV = +1V/V
MAX4180-87FF
MAX4186 CROSSTALK vs. FREQUENCY
-10 -20 CROSSTALK (dB) -30 -40 -50 -60 -70 -80 -90 -100 RF = RG = 1.1k RL = 1k VOUTD = 2Vp-p VOUTA MEASURED AV = +2V/V
MAX4180-87GG
-20 -30 -40 CROSSTALK (dB) -50 -60 -70 -80 -90 -100 -110 -120 1 10 FREQUENCY (MHz) 100 RF = RG = 1k RL = 1k VOUTB = 2Vp-p VOUTA MEASURED AV = +2V/V RF = RG = 680 RL = 150
-20 RF = 1.5k RL = 1k
0 RF = RG = 750 RL = 150
300
1
10 FREQUENCY (MHz)
100
300
1
10 FREQUENCY (MHz)
100
300
MAX4187 CROSSTALK vs. FREQUENCY
MAX4180-87HH
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX1480-87 TOCP
OUTPUT IMPEDANCE vs. FREQUENCY
MAX1480-87 TOCQ
0 -10 -20 CROSSTALK (dB) -30 -40 -50 -60 -70 -80 -90 -100 1 10 FREQUENCY (MHz) 100 RF = 1.6k RL = 1k VOUTA = 2Vp-p VOUTD MEASURED AV = +1V/V RF = 910 RL = 150
0 -10 -20 -30 PSRR (dB) -40 -50 -60 -70 -80 -90 VEE (MAX4181) VEE (MAX4181) VCC (MAX4181) VCC (MAX4180)
100
OUTPUT IMPEDANCE ()
10
1
0.1 0.01 0.1 1 FREQUENCY (MHz) 10 100 0.1 1 10 FREQUENCY (MHz) 100 1000
300
10
______________________________________________________________________________________
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, TA = +25C, unless otherwise noted.)
VOLTAGE-NOISE DENSITY vs. FREQUENCY (INPUT REFERRED)
MAX4180 TOC14
MAX4180-MAX4187
TOTAL VOLTAGE-NOISE DENSITY vs. FREQUENCY (INPUT REFERRED)
40 35 30
1.2k VIN VOUT
MAX4180 TOC15
MAX4180 HARMONIC DISTORTION vs. FREQUENCY (DUAL SUPPLIES)
MAX4180 TOC16
3.4 VOLTAGE-NOISE DENSITY (nV/Hz) 3.2 3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 100 1k 10k 100k 1M 10M 100M
45 VOLTAGE-NOISE DENSITY (nV/Hz)
-30 -40 DISTORTION (dBc) -50 -60 -70 -80 -90 -100 2ND (RL = 1k) 2ND (RL = 150) 3RD (RL = 1k) 3RD (RL = 150)
25 20 15 10 5 0
1.2k
1G
100
1k
10k
100k
1M
10M 100M
1G
0.1
1
10
100
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (MHz)
MAX4180 HARMONIC DISTORTION vs. FREQUENCY (SINGLE SUPPLY)
MAX4180 TOC17
MAX4181 HARMONIC DISTORTION vs. FREQUENCY (DUAL SUPPLIES)
MAX4180 TOC18
MAX4181 HARMONIC DISTORTION vs. FREQUENCY (SINGLE SUPPLY)
2ND (RL = 1k) -40 DISTORTION (dBc) -50 -60 -70 -80 2ND (RL = 150) 3RD (RL = 1k) 3RD (RL = 150)
MAX4180 TOC19
-30 -40 DISTORTION (dBc) -50 -60 -70 -80 -90 0.1 1 10 3RD (RL = 1k) 2ND (RL = 150) 3RD (RL = 150)
-30 -40 3RD (RL = 1k) DISTORTION (dBc) -50 -60 -70 -80 2ND (RL = 150) 3RD (RL = 150)
-30
2ND (RL = 1k)
-90 2ND (RL = 1k) -100
-90 0.1 1 10 100 0.1 1 10 100 FREQUENCY (MHz) FREQUENCY (MHz)
100
FREQUENCY (MHz)
TWO-TONE THIRD-ORDER INTERCEPT vs. FREQUENCY
MAX4180 TOC20
SUPPLY CURRENT (OPERATING & SHUTDOWN) vs. TEMPERATURE
1.25
MA4180 TOC21
OUTPUT VOLTAGE SWING vs. TEMPERATURE
RL = 1k RL = 150
MA4180 TOC22
45 f2 = f1 + 0.1MHz THIRD-ORDER INTERCEPT (dBm) 40 MAX4180 35 MAX4181
155 SHUTDOWN SUPPLY CURRENT (A)
5
SUPPLY CURRENT (mA)
SHUTDOWN SUPPLY CURRENT
140
3 OUTPUT SWING (V)
1
1.00 SUPPLY CURRENT
125
30
-1 RL = 150 RL = 1k -60 -40 -20 0 20 40 60 80 100
25
110
-3
20 10 15 20 25 30 35 40 45 50 FREQUENCY (MHz)
0.75 -60 -40 -20 0 20 40 60 80 TEMPERATURE (C)
95 100
-5
TEMPERATURE (C)
______________________________________________________________________________________
11
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown MAX4180-MAX4187
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, TA = +25C, unless otherwise noted.)
INPUT BIAS CURRENT vs. TEMPERATURE
MA4180 TOC23
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MA4180 TOC24
MAX4181 SMALL-SIGNAL PULSE RESPONSE
MAX4180/87-TOC26
1.0
4
+50mV IN -50mV
INPUT OFFSET VOLTAGE (mV)
INPUT BIAS CURRENT (A)
0.8
3
0.6
IB-
2 +50mV 1 OUT -50mV
0.4 IB+ 0.2
0 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
0 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) 10ns/div RF = 1k, RL = 150
POWER-ON TRANSIENT
MAX4180/87-TOC27
SHUTDOWN RESPONSE TIME
MAX4180/87-TOC28
MAX4180 LARGE-SIGNAL PULSE RESPONSE
+0.5V SHDN IN -0.5V
MAX4180/87-TOC29
3V
+10 VCC GND
AV = +2V/V VIN+ = 1VDC
GND +5V VOUT GND 100s/div RF = 1k, VIN = VCC/2, RL = GND 100ns/div RL = 150, RF = RG = 820 2V +1V OUT -1V 10ns/div RL = 1k, RF = RG = 1.2k
MAX4180 LARGE-SIGNAL PULSE RESPONSE
MAX4180/87-TOC31
MAX4180 LARGE-SIGNAL PULSE RESPONSE
MAX4180/87-TOC30
MAX4180 SMALL-SIGNAL PULSE RESPONSE
+25mV IN -25mV
MAX4180/87-TOC32
+0.5V IN -0.5V
+0.5V IN -0.5V
+1V OUT -1V
+1V OUT -1V
+50mV OUT -50mV
10ns/div RL = 100, RF = RG = 680
10ns/div RL = 150, RF = RG = 820
10ns/div RL = 1k, RF = RG = 1.2k
12
______________________________________________________________________________________
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown MAX4180-MAX4187
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, TA = +25C, unless otherwise noted.)
MAX4180 SMALL-SIGNAL PULSE RESPONSE
MAX4180/87-TOC33
MAX4180 SMALL-SIGNAL PULSE RESPONSE
+25mV IN -25mV
MAX4180/87-TOC34
+25mV IN -25mV
+50mV OUT -50mV 10ns/div RL = 150, RF = RG = 820
+50mV OUT -50mV
10ns/div RL = 100, RF = RG = 680
MAX4181 SMALL-SIGNAL PULSE RESPONSE
MAX4180/87-TOC36
MAX4181 LARGE-SIGNAL PULSE RESPONSE
+1V IN -1V
MAX4180/87-TOC35
+50mV IN -50mV
+50mV OUT -50mV
+1V OUT -1V
10ns/div RL = 1k, RF = 2.4k
10ns/div VS = 5V, RL = 1k, RF = 2.4k
Pin Description
MAX4180/MAX4181
PIN MAX4180/MAX4181 SO 1, 5 2 3 4 6 7 8 SOT23-6 NAME FUNCTION
--
4 3 2 1 6 5
N.C. ININ+ VEE OUT VCC SHDN
No Connection. Not internally connected. Inverting Input Noninverting Input Negative Power Supply. Connect VEE to -5V or ground for single-supply operation. Amplifier Output Positive Power Supply. Connect VCC to +5V. Shutdown Input. Device is enabled when SHDN (VCC - 2V) and disabled when SHDN (VCC - 3V). 13
______________________________________________________________________________________
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown MAX4180-MAX4187
_________________________________________________Pin Description (continued)
MAX4182/MAX4183/MAX4184/MAX4185
PIN MAX4182 MAX4184 SO 1 2 3 4 -- -- MAX4183 MAX4185 SO 1 2 3 4 5, 7, 8, 10 6 MAX4183 MAX4185 MAX 1 2 3 4 -- 5 OUTA INAINA+ VEE N.C. SHDNA Amplifier A Output Amplifier A Inverting Input Amplifier A Noninverting Input Negative Power Supply. Connect VEE to -5V or ground for single-supply operation. No Connection. Not internally connected. Shutdown Control Input for Amplifier A. Amplifier A is enabled when SHDNA (VCC - 2V) and disabled when SHDNA (VCC - 3V). Shutdown Control Input for Amplifier B. Amplifier B is enabled when SHDNB (VCC - 2V) and disabled when SHDNB (VCC - 3V). Amplifier B Noninverting Input Amplifier B Inverting Input Amplifier B Output Positive Power Supply. Connect VCC to +5V. NAME FUNCTION
-- 5 6 7 8
9 11 12 13 14
6 7 8 9 10
SHDNB INB+ INBOUTB VCC
MAX4186/MAX4187
PIN MAX4186 MAX4187 SO 1 2 3 4 5 6 7
--
MAX4186 MAX4187 QSOP 1 2 3 4 5 6 7 8, 9 10 11 12 13 14 15 16
NAME
FUNCTION
OUTA INAINA+ VCC INB+ INBOUTB N.C. OUTC INCINC+ VEE IND+ INDOUTD
Amplifier A Output Amplifier A Inverting Input Amplifier A Noninverting Input Positive Power Supply. Connect VCC to +5V. Amplifier B Noninverting Input Amplifier B Inverting Input Amplifier B Output No Connection. Not internally connected. Amplifier C Output Amplifier C Inverting Input Amplifier C Noninverting Input Negative Power Supply. Connect VEE to -5V or ground for single-supply operation. Amplifier D Noninverting Input Amplifier D Inverting Input Amplifier D Output
8 9 10 11 12 13 14 14
______________________________________________________________________________________
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown
Detailed Description
The MAX4180-MAX4187 are ultra-low-power currentfeedback amplifiers featuring bandwidths up to 270MHz, 0.1dB gain flatness to 90MHz, and low differential gain (0.08%) and phase (0.03) errors. These amplifiers achieve ultra-high bandwidth-to-power ratios with low distortion, wide signal swing, and excellent load-driving capabilities. They are optimized for 5V supplies but also operate from a single +5V supply while consuming only 1mA per amplifier. With 60mA output current drive capability, the devices achieve low distortion even while driving 150 loads. Wide bandwidth, low power, low differential phase and gain error, and excellent gain flatness make the MAX4180-MAX4187 ideal for use in portable video equipment such as cameras, video switchers, and other battery-powered applications. Their two-stage design provides higher gain and lower distortion than conventional single-stage, current-feedback topologies. This feature, combined with fast settling time, makes these devices suitable for buffering high-speed analog-to-digital converters (ADCs). The MAX4180/MAX4181/MAX4183/MAX4185 have a low-power shutdown mode that is activated by driving the amplifiers' SHDN input low. Placing them in shutdown reduces quiescent supply current to 135A (typ) and places amplifier outputs in a high-impedance state. These amplifiers can be used to implement a high-speed multiplexer by connecting together the outputs of multiple amplifiers and controlling the SHDN inputs to enable one amplifier and disable all the others. The disabled amplifiers present very little load (0.1A leakage current and 4pF capacitance) to the active amplifiers' output. Note that the feedback network impedance of all the disabled amplifiers must be considered when calculating the total load on the active amplifier output. where G = AVCL = 1 + (RF / RG), and RIN = 1 /gM 160. At low gains, G x RIN < RF. Therefore, the closed-loop bandwidth is essentially independent of closed-loop gain. Similarly, TZ > RF at low frequencies, so that: VOUT = G = 1 + (RF / RG ) VIN
MAX4180-MAX4187
Layout and Power-Supply Bypassing
The MAX4180-MAX4187 have an RF bandwidth and, consequently, require careful board layout, including the possible use of constant-impedance microstrip or stripline techniques. To realize the full AC performance of these high-speed amplifiers, pay careful attention to power-supply bypassing and board layout. The PC board should have at least two layers: a signal and power layer on one side, and a large, low-impedance ground plane on the other side. The ground plane should be as free of voids as possible. With multilayer boards, locate the ground plane on a layer that incorporates no signal or power traces. Regardless of whether a constant-impedance board is used, observe the following guidelines when designing the board: * Do not use wire-wrap boards. They are too inductive. * Do not use breadboards. They are too capacitive. * Do not use IC sockets. They increase parasitic capacitance and inductance. * Use surface-mount components rather than throughhole components. They give better high-frequency performance, have shorter leads, and have lower parasitic reactances.
Application Information
Theory of Operation
The MAX4180-MAX4187 are current-feedback amplifiers, and their open-loop transfer function is expressed as a transimpedance, VOUT/IIN, or TZ. The frequency behavior of the open-loop transimpedance is similar to the open-loop gain of a voltage-mode feedback amplifier. That is, it has a large DC value and decreases at approximately 6dB per octave. Analyzing the follower with gain, as shown in Figure 1, yields the following transfer function: VOUT / VIN = G x [(TZ (S) / TZ(s) + G x (RIN + RF)]
RG
RF
RIN +1 +1 T2 MAX4180-MAX4187 VIN VOUT
Figure 1. Current-Feedback Amplifier ______________________________________________________________________________________ 15
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown MAX4180-MAX4187
* Keep lines as short and as straight as possible. * Do not make 90 turns; round all corners. * Observe high-frequency bypassing techniques to maintain the amplifiers' accuracy. The bypass capacitors should include a 0.01F to 0.1F ceramic capacitor between each supply pin and the ground plane, located as close to the package as possible. * Place a 1F ceramic capacitor in parallel with each 0.01F to 0.1F capacitor as close to them as possible. * Place a 10F to 15F low-ESR tantalum at the point of entry to the power-supply pins' PC board. The power-supply trace should lead directly from the tantalum capacitor to the VCC and VEE pins. * Keep PC traces short and use surface-mount components to minimize parasitic inductance.
Maxim's High-Speed Evaluation Board
Figures 2 and 3 show layouts of Maxim's high-speed single SOT23 and SO evaluation boards. These boards were developed using the techniques described above. The smallest available surface-mount resistors were used for feedback and back-termination to minimize their distance from the part, reducing the capacitance associated with longer lead lengths. SMA connectors were used for best high-frequency performance. Because distances are extremely short, performance is unaffected by the fact that inputs and outputs do not match a 50 line. However, in applications that require lead lengths greater than one-quarter of the wavelength of the highest frequency of interest, use constant-impedance traces. Fully assembled evaluation boards are available for the MAX4180ESA.
Figure 2a. SOT23 High-Speed EV Board Component Placement Guide-- Component Side
Figure 2b. SOT23 High-Speed EV Board Layout--Component Side
Figure 2c. High-Speed EV Board Layout-- Solder Side
Figure 3a. SO-8 High-Speed EV Board Component Placement Guide-- Component Side 16
Figure 3b. SO-8 High-Speed EV Board Layout--Component Side
Figure 3c. SO-8 High-Speed EV Board Layout--Solder Side
______________________________________________________________________________________
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown MAX4180-MAX4187
Table 1. Recommended Component Values
MAX4180 COMPONENT/BW RL = 1k RF () RG () -3dB BW (MHz) 1.2k 1.2k 245 AV = +2V/V RL = 150 820 820 190 RL = 100 680 680 190 AV = +5V/V RL = 1k/150 520 130 120 AV = +10V/V RL = 1k/150 560 56 76 RL = 1k 2.4k -- 270 MAX4181 AV = +1V/V RL = 150 1k -- 205 RL = 100 560 -- 200
MAX4182/MAX4183 COMPONENT/ BW RL = 1k RF () RG () -3dB BW (MHz) 1k 1k 245 AV = +2V/V RL = 150 680 680 190 RL = 100 620 620 160
MAX4184/MAX4185 AV = +1V/V RL = 1k 1.5k -- 270 RL = 150 750 -- 205 RL = 100 620 -- 180 RL = 1k 1.1k 1.1k 245
MAX4186 AV = +2V/V RL = 150 750 750 190 RL = 100 680 680 175 RL = 1k 1.6k -- 270
MAX4187 AV = +1V/V RL = 150 910 -- 205 RL = 100 680 -- 200
Choosing Feedback and Gain Resistors
The optimum value of the external-feedback (RF) and gain-setting (RG) resistors used with the MAX4180- MAX4187 depends on the closed-loop gain and the application circuit's load. Table 1 lists the optimum resistor values for some specific gain configurations. One-percent resistor values are preferred to maintain consistency over a wide range of production lots. Figures 4a and 4b show the standard inverting and noninverting configurations. Note: The noninverting circuit gain (Figure 4) is 1 plus the magnitude of the inverting closed-loop gain. Otherwise, the two circuits are identical.
* The input offset voltage (VOS) times the closed-loop gain (1 = RF / RG). * The positive input bias current (IB+) times the source resistor (RS) (usually 50 or 75), plus the negative input bias current (IB-) times the parallel combination of RG and RF. In current-feedback amplifiers, the input bias currents at the IN+ and IN- terminals do not track each other and may have opposite polarity, so there is no benefit to matching the resistance at both inputs. The equation for the total DC error at the output is:
VOUT =
DC and Noise Errors
Several major error sources must be considered in any op amp. These apply equally to the MAX4180- MAX4187. Offset-error terms are given by the equation below. Voltage and current-noise errors are root-square summed and are therefore computed separately. In Figure 5, the total output offset voltage is determined by the following factors:
[(I
B+ RS + IB- RF || RG + VOS 1 +
)
( )(
)
]
RF RG
The total output-referred noise voltage is:
e R = 1+ F n(OUT) R G
2 2 i R + i R || R + e 2 n n+ S n- F G
()
()
()
______________________________________________________________________________________
17
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown MAX4180-MAX4187
The MAX4180-MAX4187 have a very low, 2nV/Hz noise voltage. The current noise at the positive input (in+) is 4pA/Hz, and the current noise at the inverting input is 5pA/Hz. An example of the DC error calculations, using the MAX4180 typical data and typical operating circuit where R F = R G = 1.2k (R F || R G = 600) and RS = 37.5, gives the following:
VOUT = 1x10 -6 x37.5 + 2x10 -6 x 600 + 1.5x10 -3 x 1+ 1 VOUT = 4.1mV
Video Line Driver
The MAX4180-MAX4187 are well suited to drive coaxial transmission lines when the cable is terminated at both ends, as shown in Figure 6. Cable-frequency response can cause variations in the signal's flatness. See Table 1 for optimum RF and RG values.
Driving Capacitive Loads
The MAX4180-MAX4187 are optimized for AC performance. They are not designed to drive highly capacitive loads. Reactive loads decrease phase margin and may produce excessive ringing and oscillation. Figure 7a shows a circuit that eliminates this problem. Placing the small (usually 5 to 22) isolation resistor, RS, before the reactive load prevents ringing and oscillation. At higher capacitive loads, the interaction of the load capacitance and isolation resistor controls AC performance. Figures 7b and 7c show the MAX4180 and MAX4181 frequency response with a 47pF capaci-
(
)
()
Calculating the total output noise in a similar manner yields:
4 x 10-12 x 37.5 + 5 x 10-12 x 255 + 2 x 10-9
2 2 2
en(OUT) = 1+ 1
()
en(OUT) = 4.8nV/ Hz
RG RF IBIB+ RS
With a 200MHz system bandwidth, this calculates to 102VRMS (approximately 612Vp-p, choosing the sixsigma value).
VOUT
MAX4180-MAX4187
VIN RS RT RG RF VOUT RO
RG 820 RF 820 +5V 0.1F
Figure 5. Output Offset Voltage
MAX4180-MAX4187
VOUT = -(RF / RG) x VIN
Figure 4a. Inverting Gain Configuration
VIN RS RT RG RF VOUT RO
VIDEO IN 75 CABLE 75 75 CABLE VIDEO OUT
MAX4180
75
75
0.1F -5V
0.1F
MAX4180-MAX4187
VOUT = [1+ (RF / RG) VIN
VIDEO LINE DRIVER
Figure 4b. Noninverting Gain Configuration 18
Figure 6. Video Line Driver
______________________________________________________________________________________
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown
RG RF RS
tive load. Note that in each case, gain peaking is substantially reduced when the 20 resistor is used to isolate the capacitive load from the amplifier output.
MAX4180-MAX4187
AC Testing/Performance
CL RL
VIN
Figure 7a. Using an Isolation Resistor (RS) for High-Capacitive Loads
6 5 4 NORMALIZED GAIN (dB) 3 2 1 0 -1 -2 -3 -4 1 10 100 1000 FREQUENCY (MHz) RS = 20 MAX4180 VIN = 20mVp-p AV = +2V/V RF = RG = 1.2k RL = 1k || 47pF RS = 0
AC specifications on high-speed amplifiers are usually guaranteed without 100% production testing. Since these high-speed devices are sensitive to external parasitics introduced when automatic handling equipment is used, it is impractical to guarantee AC parameters through volume production testing. These parasitics are greatly reduced when using the recommended PC board layout (like the Maxim EV kit). Characterizing the part in this way more accurately represents the amplifier's true AC performance. Some manufacturers guarantee AC specifications without clearly stating how this guarantee is made. The AC specifications of the MAX4180-MAX4187 are derived through worst-case design simulations combined with a sample characterization of 100 units. The AC performance distributions along with the worst-case simulation results for MAX4180 and MAX4181 are shown in Figures 8-11. These distributions are repeatable provided that the proper board layout and power-supply bypassing are used (see Layout and Power-Supply Bypassing section).
Figure 7b. Frequency Response with Capacitive Load (With and Without Isolation Resistor)
6 5 4 3 GAIN (dB) 2 1 0 -1 -2 -3 -4 1 10 100 1000 FREQUENCY (MHz) RS = 20 MAX4181 VIN = 20mVp-p AV = +1V/V RF = 2.4k RL = 1k || 47pF
RS = 0
Figure 7c. Frequency Response with Capacitive Load (With and Without Isolation Resistor) ______________________________________________________________________________________ 19
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown
VS = 5V VIN = 20mVp-p AV = +2V/V RL = 1k 100 UNITS
MAX4180 FIG.8b MAX4180 FIG.9b MAX4180 FIG.8d MAX4180 FIG.8a
60 50 SIMULATION LOWER LIMIT NUMBER OF UNITS 40 30 20 10 0 VS = 5V VIN = 20mVp-p AV = +2V/V RL = 1k 100 UNITS
25
NUMBER OF UNITS
15
10
5
0 100 115 130 145 160 175 190 205 220 235 250 265 280 295 310 315 330 345 -3dB BANDWIDTH (MHz)
0
10
20
SIMULATION LOWER LIMIT 30 40
20
50
60
70
80
90
100 110 120 130 140
0.1dB BANDWIDTH (MHz)
Figure 8a. MAX4180 -3dB Bandwidth Distribution (Dual Supplies)
Figure 8b. MAX4180 0.1dB Bandwidth Distribution (Dual Supplies)
MAX4180 FIG.8c
80 70 60 NUMBER OF UNITS 50 SIMULATION LOWER LIMIT 40 30 20 10 0 300 310 320 330 340 350 360 370 380 390 400 410 420 430 440 RISING-EDGE SLEW RATE (V/s) VS = 5V VOUT = 2V STEP AV = +2V/V RL = 1k 100 UNITS
60 50 NUMBER OF UNITS 40 30 20 10 0 SIMULATION LOWER LIMIT VS = 5V VOUT = 2V STEP AV = +2V/V RL = 1k 100 UNITS
250 260 270 280 290 300 310 320 330 340 350 360 370 380 390 400 FALLING-EDGE SLEW RATE (V/s)
Figure 8c. MAX4180 Rising-Edge Slew-Rate Distribution (Dual Supplies)
Figure 8d. MAX4180 Falling-Edge Slew-Rate Distribution (Dual Supplies)
MAX4180 FIG.9a
80 70 60 NUMBER OF UNITS SIMULATION LOWER LIMIT 50 40 30 20 10 0 100 115 130 145 160 175 190 205 220 235 250 265 280 295 310 315 330 345 -3dB BANDWIDTH (MHz) VS = +5V VIN = 20mVp-p AV = +2V/V RL = 1k 100 UNITS
40 35 30 NUMBER OF UNITS SIMULATION LOWER LIMIT 25 20 15 10 5 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 VS = +5V VIN = 20mVp-p AV = +2V/V RL = 1k 100 UNITS
0.1dB BANDWIDTH (MHz)
Figure 9a. MAX4180 -3dB Bandwidth Distribution (Single Supply) 20
Figure 9b. MAX4180 0.1dB Bandwidth Distribution (Single Supply)
______________________________________________________________________________________
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown MAX4180-MAX4187
MAX4180 FIG 9c MAX4180 FIG.9d
70 60 NUMBER OF UNITS 50 SIMULATION LOWER LIMIT 40 30 20 10 0 VS = +5V VOUT = 2V STEP AV = +2V/V RL = 1k 100 UNITS
60 50 NUMBER OF UNITS 40 SIMULATION LOWER LIMIT 30 20 10 0 VS = +5V VOUT = 2V STEP AV = +2V/V RL = 1k 100 UNITS
240 250 260 270 340 350 360 370 380 390 400 410 420 430 440 RISING-EDGE SLEW RATE (V/s)
250 260 270 280 290 300 310 320 330 340 350 360 370 380 390 400 FALLING-EDGE SLEW RATE (V/s)
Figure 9c. MAX4180 Rising-Edge Slew-Rate Distribution (Single Supply)
Figure 9d. MAX4180 Falling-Edge Slew-Rate Distribution (Single Supply)
MAX4180 FIG 10a
30 NUMBER OF UNITS 25 SIMULATION LOWER LIMIT 20 15 10 5 0
NUMBER OF UNITS
VS = 5V VIN = 20mVp-p AV = +1V/V RL = 1k 100 UNITS
16 14 12 10 8 6 4 2 SIMULATION LOWER LIMIT
VS = 5V VIN = 20mVp-p AV = +1V/V RL = 1k 100 UNITS
160
170
180
190
200
210
220
230
240
250
260
270
280
0
0
10
20
30
40
50
60
70
80
90
100
110
120
-3dB BANDWIDTH (MHz)
0.1dB BANDWIDTH (MHz)
Figure 10a. MAX4181 -3dB Bandwidth Distribution (Dual Supplies)
Figure 10b. MAX4181 0.1dB Bandwidth Distribution (Dual Supplies)
70 60 NUMBER OF UNITS 50 SIMULATION LOWER LIMIT 40 30 20 10 0 180 190 200 210 220 230 240 250 260
NUMBER OF UNITS
VS = 5V VIN = 2V STEP AV = +1V/V RL = 1k 100 UNITS
MAX4180 FIG 10c
50 40 30 20 10 0 SIMULATION LOWER LIMIT
VS = 5V VIN = 2V STEP AV = +1V/V RL = 1k 100 UNITS
270
280
290
300
310
140
150
160
170
180
190
200
210
220
230
240
250
260
270
RISING-EDGE SLEW RATE (V/s)
FALLING-EDGE SLEW RATE (V/s)
Figure 10c. MAX4181 Rising-Edge Slew-Rate Distribution (Dual Supplies)
Figure 10d. MAX4181 Falling-Edge Slew-Rate Distribution (Dual Supplies) 21
______________________________________________________________________________________
MAX4180 FIG 10d
80
60
MAX4180 FIG 10a
35
18
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown MAX4180-MAX4187
MAX4180 FIG 11b MAX4180 FIG 11d MAX4180 FIG 11a
50 VS = +5V VIN = 20mVp-p AV = +1V/V RL = 1k 100 UNITS SIMULATION LOWER LIMIT
30 25 NUMBER OF UNITS 20 15 10 5 0 SIMULATION LOWER LIMIT VS = +5V VIN = 20mVp-p AV = +1V/V RL = 1k 100 UNITS
40 NUMBER OF UNITS
30
20
10
0
160
170
180
190
200
210
220
230
240
250
260
270
280
0
10
20
30
40
50
60
70
80
90
100
110
120
-3dB BANDWIDTH (MHz)
0.1dB BANDWIDTH (MHz)
Figure 11a. MAX4181 -3dB Bandwidth Distribution (Single Supply)
Figure 11b. MAX4181 0.1dB Bandwidth Distribution (Single Supply)
70 60 NUMBER OF UNITS 50 40 30 20 10 0 180 190 200 210 220 230 240 250 260 270 280 SIMULATION LOWER LIMIT
NUMBER OF UNITS
VS = +5V VIN = 2V STEP AV = +1V/V RL = 1k 100 UNITS
MAX4180 FIG 11c
80
100 90 80 70 60 50 40 30 20 10 SIMULATION LOWER LIMIT VS = +5V VIN = 2V STEP AV = +1V/V RL = 1k 100 UNITS
290
300
310
0 140 150 160 170 180 190 200 210 220 230 240 250 260 270 FALLING-EDGE SLEW RATE (V/s)
RISING-EDGE SLEW RATE (V/s)
Figure 11c. MAX4181 Rising-Edge Slew-Rate Distribution (Single Supply)
Figure 11d. MAX4181 Falling-Edge Slew-Rate Distribution (Single Supply)
22
______________________________________________________________________________________
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown MAX4180-MAX4187
Pin Configurations (continued)
TOP VIEW SINGLE
N.C. 1 IN- 2 IN+ 3 VEE 4 8 7 SHDN VCC OUT N.C. OUTA 1 INA- 2 INA+ 3 VEE 4
DUAL
8 7 VCC OUTB INBINB+
MAX4180 MAX4181
6 5
MAX4182 MAX4184
6 5
SO
SO
DUAL
OUTA 1 INA- 2 INA+ 3 VEE 4 N.C. 5 SHDNA 6 N.C. 7 14 VCC 13 OUTB OUTA 1 INA- 2 INA+ 3 VCC 4 INB+ 5 INB- 6 OUTB 7
QUAD
14 OUTD 13 IND-
MAX4183 MAX4185
12 INB11 INB+ 10 N.C. 9 8 SHDNB N.C.
MAX4186 MAX4187
12 IND+ 11 VEE 10 INC+ 9 8 INCOUTC
SO DUAL
OUTA 1 INAINA+ VEE SHDNA 2 3 4 5 10 VCC 9 OUTB INBINB+ SHDNB OUTA 1 INA- 2 INA+ 3 VCC 4 INB+ 5 INB- 6 OUTB 7 N.C. 8
SO QUAD
16 OUTD 15 IND-
MAX4183 MAX4185
8 7 6
MAX4186 MAX4187
14 IND+ 13 VEE 12 INC+ 11 INC10 OUTC 9 N.C.
MAX
QSOP
______________________________________________________________________________________
23
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown MAX4180-MAX4187
Ordering Information (continued)
PART MAX4181EUT-T MAX4181ESA MAX4182ESA MAX4183EUB MAX4183ESD MAX4184ESA MAX4185EUB MAX4185ESD MAX4186ESD MAX4186EEE MAX4187ESD MAX4187EEE TEMP RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 6 SOT23-6 8 SO 8 SO 10 MAX* 14 SO 8 SO 10 MAX* 14 SO 14 SO 16 QSOP 14 SO 16 QSOP TOP MARK AAAC -- -- -- -- -- -- -- -- -- -- --
Chip Information
MAX4180/MAX4181 TRANSISTOR COUNT: 83 SUBSTRATE CONNECTED TO VEE MAX4182-MAX4185 TRANSISTOR COUNT: 166 SUBSTRATE CONNECTED TO VEE MAX4186/MAX4187 TRANSISTOR COUNT: 235 SUBSTRATE CONNECTED TO VEE
*Contact factory for availability.
Package Information
6LSOT.EPS
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
24 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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