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19-1230; Rev 2a; 6/97
KIT ATION EVALU BLE AVAILA
1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown
____________________________Features
o Ultra-High Speed and Fast Settling Time: 1GHz -3dB Bandwidth (MAX4223, Gain = +1) 600MHz -3dB Bandwidth (MAX4224, Gain = +2) 1700V/s Slew Rate (MAX4224) 5ns Settling Time to 0.1% (MAX4224) o Excellent Video Specifications (MAX4223): Gain Flatness of 0.1dB to 300MHz 0.01%/0.02 DG/DP Errors o Low Distortion: -60dBc THD (fc = 10MHz) 42dBm Third-Order Intercept (f = 30MHz) o 6.0mA Quiescent Supply Current (per amplifier) o Shutdown Mode: 350A Supply Current (per amplifier) 100k Output Impedance o High Output Drive Capability: 80mA Output Current Drives up to 4 Back-Terminated 75 Loads to 2.5V while Maintaining Excellent Differential Gain/Phase Characteristics o Available in Tiny 6-Pin SOT23 and 10-Pin MAX Packages
_______________General Description
The MAX4223-MAX4228 current-feedback amplifiers combine ultra-high-speed performance, low distortion, and excellent video specifications with low-power operation. The MAX4223/MAX4224/MAX4226/MAX4228 have a shutdown feature that reduces power-supply current to 350A and places the outputs into a highimpedance state. These devices operate with dual supplies ranging from 2.85V to 5.5V and provide a typical output drive current of 80mA. The MAX4223/ MAX4225/MAX4226 are optimized for a closed-loop gain of +1 (0dB) or more and have a -3dB bandwidth of 1GHz, while the MAX4224/MAX4227/MAX4228 are compensated for a closed-loop gain of +2 (6dB) or more, and have a -3dB bandwidth of 600MHz (1.2GHz gain-bandwidth product). The MAX4223-MAX4228 are ideal for professional video applications, with differential gain and phase errors of 0.01% and 0.02, 0.1dB gain flatness of 300MHz, and a 1100V/s slew rate. Total harmonic distortion (THD) of -60dBc (10MHz) and an 8ns settling time to 0.1% suit these devices for driving high-speed analog-to-digital inputs or for data-communications applications. The lowpower shutdown mode on the MAX4223/MAX4224/ MAX4226/MAX4228 makes them suitable for portable and battery-powered applications. Their high output impedance in shutdown mode is excellent for multiplexing applications. The single MAX4223/MAX4224 are available in spacesaving 6-pin SOT23 packages. All devices are available in the extended -40C to +85C temperature range.
MAX4223-MAX4228
______________Ordering Information
PART TEMP. RANGE PINPACKAGE 6 SOT23 8 SO SOT TOP MARK AAAD --
________________________Applications
ADC Input Buffers Video Cameras Video Switches Video Editors RF Receivers Data Communications Video Line Drivers Video Multiplexing XDSL Drivers Differential Line Drivers
MAX4223EUT-T -40C to +85C MAX4223ESA -40C to +85C
Ordering Information continued at end of data sheet.
_____________________Selector Guide
PART MAX4223 MAX4224 MAX4225 MAX4226 MIN. GAIN 1 2 1 1 2 2 AMPS PER PKG. 1 1 2 2 2 2 SHUTDOWN MODE Yes Yes No Yes No Yes PINPACKAGE 6 SOT23, 8 SO 6 SOT23, 8 SO 8 SO 10 MAX, 14 SO 8 SO 10 MAX, 14 SO 1
_________________Pin Configurations
TOP VIEW
OUT 1 6 VCC
VEE 2
5
SHDN
IN+ 3
4
IN-
Pin Configurations continued at end of data sheet.
MAX4227
SOT23-6
MAX4223 MAX4224
MAX4228
________________________________________________________________ Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 For small orders, phone 408-737-7600 ext. 3468.
1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown MAX4223-MAX4228
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE) ..................................................12V Analog Input Voltage .......................(VEE - 0.3V) to (VCC + 0.3V) Analog Input Current ........................................................25mA SHDN Input Voltage.........................(VEE - 0.3V) to (VCC + 0.3V) Short-Circuit Duration OUT to GND ...........................................................Continuous OUT to VCC or VEE............................................................5sec Continuous Power Dissipation (TA = +70C) 6-Pin SOT23 (derate 7.1mW/C above +70C).............571mW 8-Pin SO (derate 5.9mW/C above +70C)...................471mW 10-Pin MAX (derate 5.6mW/C above +70C) ............444mW 14-Pin SO (derate 8.3mW/C above +70C).................667mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+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
(VCC = +5V, VEE = -5V, SHDN = 5V, VCM = 0V, RL = TA = TMIN to TMAX, unless otherwise noted. Typical values are at , TA = +25C.) (Note 1) PARAMETER SYMBOL TA = +25C Input Offset Voltage VOS TA = TMIN to TMAX Input Offset Voltage Drift Input Bias Current (Positive Input) Input Bias Current (Negative Input) Input Resistance (Positive Input) Input Resistance (Negative Input) Input Common-Mode Voltage Range Common-Mode Rejection Ratio Operating Supply Voltage Range Power-Supply Rejection Ratio Quiescent Supply Current (per Amplifier) Open-Loop Transresistance Output Voltage Swing Output Current (Note 2) Short-Circuit Output Current SHDN Logic Low SHDN Logic High 2 TCVOS IB+ TA = +25C TA = TMIN to TMAX TA = +25C IBTA = TMIN to TMAX RIN+ RINVCM CMRR VCC/VEE PSRR ISY TR VOUT IOUT ISC VIL VIH 2.0 Inferred from CMRR test VCM = 2.5V Inferred from PSRR test VCC = 2.85V to 5.5V, VEE = -2.85V to -5.5V TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 2.5 55 50 2.85 68 63 6.0 0.35 0.7 0.3 2.5 60 1.5 0.8 2.8 80 140 0.8 9.0 0.55 74 5.5 MAX4223/MAX4224 MAX4225-MAX4228 MAX4223/MAX4224 MAX4225-MAX4228 700 45 3.2 61 4 4 CONDITIONS MAX4223/MAX4224 MAX4225-MAX4228 MAX4223/MAX4224 MAX4225-MAX4228 2 2 10 15 20 25 30 35 k V dB V dB mA M V mA mA V V A MIN TYP 0.5 0.5 MAX 4 5 6 7 V/C A mV UNITS
Normal mode (SHDN = 5V) Shutdown mode (SHDN = 0V) RL = VOUT = 2.5V RL = 50 RL = 50 VOUT = 2.5V RL = short to ground
_______________________________________________________________________________________
1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VEE = -5V, SHDN = 5V, VCM = 0V, RL = TA = TMIN to TMAX, unless otherwise noted. Typical values are at , TA = +25C.) (Note 1) PARAMETER SHDN Input Current Shutdown Mode Output Impedance SYMBOL IIL/IIH CONDITIONS SHDN = 0V or 5V SHDN = 0V, VOUT = -2.5V to +2.5V (Note 3) 10 MIN TYP 25 100 MAX 70 UNITS A k
MAX4223-MAX4228
AC ELECTRICAL CHARACTERISTICS
(VCC = +5V, VEE = -5V, SHDN = 5V, VCM = 0V, AV = +1V/V for MAX4223/MAX4225/MAX4226, AV = +2V/V for MAX4224/MAX4227/ MAX4228, RL = 100, TA = +25C, unless otherwise noted.) (Note 4) PARAMETER -3dB Small-Signal Bandwidth (Note 5) Bandwidth for 0.1dB Gain Flatness (Note 5) Gain Peaking Large-Signal Bandwidth BWLS SYMBOL BW BW0.1dB CONDITIONS VOUT = 20mVp-p VOUT = 20mVp-p MAX4223/5/6 MAX4224/7/8 VOUT = 2Vp-p Rising edge Slew Rate (Note 5) SR VOUT = 4V step Falling edge Settling Time to 0.1% Rise and Fall Time Off Isolation Crosstalk Turn-On Time from Shutdown Turn-Off Time to Shutdown Power-Up Time Differential Gain Error Differential Phase Error XTALK tON tOFF tUP DG DP tS tr, tf VOUT = 2V step VOUT = 2V step MAX4223/5/6 MAX4224/7/8 MAX4223/5/6 MAX4224/7/8 MAX4223/5/6 MAX4224/7/8 MAX4223/5/6 MAX4224/7/8 MAX4223/5/6 MAX4224/7/8 MAX4225/6 MAX4227/8 850 1400 625 1100 MAX4223/5/6 MAX4224/7/8 MAX4223/5/6 MAX4224/7/8 MIN 750 325 100 60 TYP 1000 600 300 200 1.5 0.1 250 330 1100 1700 800 1400 8 5 1.5 1.0 65 -68 -72 2 300 100 MAX4223/5/6 MAX4224/7/8 MAX4223/5/6 MAX4224/7/8 MAX4223/5/6 MAX4224/7/8 MAX4223/5/6 MAX4224/7/8 0.01 0.02 0.02 0.01 -60 -61 -65 -78 dBc ns ns dB dB s ns ns % degrees V/s MAX UNITS MHz MHz dB MHz
SHDN = 0V, f = 10MHz, MAX4223/4/6/8 f = 30MHz, RS = 50 MAX4223/4/6/8 MAX4223/4/6/8 VCC, VEE = 0V to 5V step RL = 150 (Note 6) RL = 150 (Note 6) RL = 100 RL = 1k
Total Harmonic Distortion
THD
VOUT = 2Vp-p, fC = 10MHz
_______________________________________________________________________________________
3
1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown MAX4223-MAX4228
AC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VEE = -5V, SHDN = 5V, VCM = 0V, AV = +1V/V for MAX4223/MAX4225/MAX4226, AV = +2V/V for MAX4224/MAX4227/ MAX4228, RL = 100, TA = +25C, unless otherwise noted.) (Note 4) PARAMETER Output Impedance Third-Order Intercept Spurious-Free Dynamic Range 1dB Gain Compression Input Noise Voltage Density Input Noise Current Density en in+, inSYMBOL ZOUT IP3 SFDR f = 10kHz f = 30kHz fz = 30.1MHz f = 10kHz f = 10kHz f = 10kHz f = 10kHz SO-8, SO-14 packages SOT23-6, 10-pin MAX packages IN+ INPin to pin Pin to GND Pin to pin Pin to GND MAX4223/5/6 MAX4224/7/8 MAX4223/5/6 MAX4224/7/8 CONDITIONS MIN TYP 2 42 36 -61 -62 20 2 3 20 0.3 1.0 0.3 0.8 pF MAX UNITS dBm dB dBm nV/Hz pA/Hz
Input Capacitance (Note 7)
CIN
Note 1: Note 2: Note 3: Note 4:
The MAX422_EUT is 100% production tested at TA = +25C. Specifications over temperature limits are guaranteed by design. Absolute Maximum Power Dissipation must be observed. Does not include impedance of external feedback resistor network. AC specifications shown are with optimal values of RF and RG. These values vary for product and package type, and are tabulated in the Applications Information section of this data sheet. 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 these parameters, contact the factory. Note 6: Input Test Signal: 3.58MHz sine wave of amplitude 40IRE superimposed on a linear ramp (0IRE to 100IRE). IRE is a unit of video signal amplitude developed by the International Radio Engineers. 140IRE = 1V. Note 7: Assumes printed circuit board layout similar to that of Maxim's evaluation kit.
__________________________________________Typical Operating Characteristics
(VCC = +5V, VEE = -5V, RL = 100, TA = +25C, unless otherwise noted.)
MAX4223 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +1)
MAX4223-01
MAX4223 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +2/+5)
MAX4223-02
MAX4223/MAX4225/MAX4226 LARGE-SIGNAL GAIN vs. FREQUENCY (AVCL = +1)
3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 AV = +1V/V RF = 560 VOUT = 2Vp-p
MAX4223-03
4 3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 1 10 100 FREQUENCY (MHz) 1000 SOT23-6 RF = 470 VIN = 20mVp-p SO-8 PACKAGE RF = 560
4 3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 1 10 100 FREQUENCY (MHz) 1000 AV = +5V/V RF = 100 RG = 25 VIN = 20mVp-p AV = +2V/V RF = RG = 200
4
1
10
100 FREQUENCY (MHz)
1000
4
_______________________________________________________________________________________
1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown
____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, RL = 100, TA = +25C, unless otherwise noted.)
MAX4224 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +2)
MAX4223-04
MAX4223-MAX4228
MAX4224 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +5/+10)
MAX4223-05
MAX4224/MAX4227/MAX4228 LARGE-SIGNAL GAIN vs. FREQUENCY (AVCL = +2)
3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 AVCL = +2V/V RF = RG = 470 VOUT = 2Vp-p
MAX4223-06
4 3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 1 10 100 FREQUENCY (MHz) 1000 SO-8 PACKAGE RF = RG = 470 SOT23-6 PACKAGE RF = RG = 470 VIN = 20mVp-p
4 3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 1 10 100 FREQUENCY (MHz) 1000 AVCL = +10V/V RF = 130 RG = 15 VIN = 20mVp-p AVCL = +5V/V RF = 240 RG = 62
4
1
10
100 FREQUENCY (MHz)
1000
MAX4225/MAX4226 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +1)
MAX4223-07
MAX4225/MAX4226 GAIN MATCHING vs. FREQUENCY (AVCL = +1)
MAX4223-08
MAX4227/MAX4228 SMALL-SIGNAL GAIN vs. FREQUENCY (AVCL = +2)
3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 VIN = 20mVp-p AVCL = +2V/V RF = RG = 470
MAX4223-09
4 3 2 1 GAIN (dB) VIN = 20mVp-p AVCL = +1V/V RF = 560
0.4 0.3 0.2 0.1 GAIN (dB) 0 -0.1 -0.2 -0.3 -0.4 -0.5 AMPLIFIER B VIN = 2OmVp-p AVCL = +1V/V RF = 560 AMPLIFIER A
4
0 -1 -2 -3 -4 -5 -6 1 10 100 FREQUENCY (MHz) 1000
-0.6 1 10 FREQUENCY (MHz) 100
1
10
100 FREQUENCY (MHz)
1000
MAX4227/MAX4228 GAIN MATCHING vs. FREQUENCY (AVCL = +2)
MAX4223-10
MAX4225/MAX4226 CROSSTALK vs. FREQUENCY
MAX4223-11
MAX4227/MAX4228 CROSSTALK vs. FREQUENCY
-10 -20 CROSSTALK (dB) -30 -40 -50 -60 -70 -80 -90 -100 RS = 50 VOUT = 2Vp-p
MAX4223-12
0.4 0.3 0.2 NORMALIZED GAIN (dB) 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 0.1 1 10 FREQUENCY (MHz) 100 VIN = 20mVp-p AVCL = +2V/V RF = RG = 470
0 -10 -20 CROSSTALK (dB) -30 -40 -50 -60 -70 -80 -90 -100 1 10 100 FREQUENCY (MHz) 1000 RS = 50 VOUT = 2Vp-p
0
1
10
100 FREQUENCY (MHz)
1000
_______________________________________________________________________________________
5
1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown MAX4223-MAX4228
____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, RL = 100, TA = +25C, unless otherwise noted.)
MAX4223/MAX4225/MAX4226 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (AVCL = +1)
MAX4223-13
MAX4224/MAX4227/MAX4228 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (AVCL = +2)
MAX4223-14
OUTPUT IMPEDANCE vs. FREQUENCY
MAX4223-15
10 0 -10 -20 PSRR (dB) VCC AVCL = +1V/V RF = 560
10 0 -10 -20 PSRR (dB) -30 -40 -50 -60 VEE VCC AVCL = +2V/V RF = RG = 470
100
OUTPUT IMPEDANCE ()
10
-30 -40 -50 -60 -70 -80 -90 0.01 0.1
MAX4223/5/6 AVCL = +1V/V RF = 560
1 MAX4224/7/8 AVCL = +2V/V RF = RG = 470
VEE
-70 -80 -90
0.1
0.01 0.01 0.1 1 10 100 0.01 0.1 1 10 100 FREQUENCY (MHz) FREQUENCY (MHz)
1
10
100
FREQUENCY (MHz)
SHUTDOWN MODE OUTPUT ISOLATION vs. FREQUENCY
MAX4223-16
MAX4223/MAX4225/MAX4226 TOTAL HARMONIC DISTORTION vs. FREQUENCY (RL = 150)
MAX4223-17
MAX4223/MAX4225/MAX4226 TOTAL HARMONIC DISTORTION vs. FREQUENCY (RL = 1k)
AVCL = +1V/V RL = 1k RF = 560 VOUT = 2Vp-p
MAX4223-18
20 SHUTDOWN MODE OUTPUT ISOLATION (dB) 0 -20 -40 -60 -80 -100 -120 -140 -160 -180 0.01 0.1 1 10 100 MAX4224/7/8 AVCL = +2V/V RF = RG = 470 MAX4223/5/6 AVCL = +1V/V RF = 560
-30 -40 -50 THD (dBc) -60 -70 -80 -90 0.1 1 10 2ND HARMONIC 3RD HARMONIC AVCL = +1V/V RL = 150 RF = 560 VOUT = 2Vp-p THD
-30 -40 -50 THD (dBc) -60 -70 2ND HARMONIC -80 -90 -100 3RD HARMONIC
THD
1000
100
0.1
1
10
100
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX4224/MAX4227/MAX4228 TOTAL HARMONIC DISTORTION vs. FREQUENCY (RL = 150)
MAX4223-19
MAX4224/MAX4227/MAX4228 TOTAL HARMONIC DISTORTION vs. FREQUENCY (RL = 1k)
MAX4223-20
TWO-TONE THIRD-ORDER INTERCEPT vs. FREQUENCY
MAX4223-21
-30 -40 -50 THD (dBc) -60 -70 -80 -90 0.1 1 10 2ND HARMONIC 3RD HARMONIC THD
-30 -40 -50 THD (dBc) -60 -70 -80 -90 3RD HARMONIC -100 2ND HARMONIC THD
55 THIRD-ORDER INTERCEPT (dBm) 50 45 40 35 30 25 20 MAX4224/7/8
MAX4223/5/6
100
0.1
1
10
100
10
20
30
40
50
60
70
80
90 100
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
6
_______________________________________________________________________________________
1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown
____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, RL = 100, TA = +25C, unless otherwise noted.)
MAX4223/MAX4225/MAX4226 SMALL-SIGNAL PULSE RESPONSE (AVCL = +1)
MAX4223-22
MAX4223-MAX4228
MAX4223/MAX4225/MAX4226 SMALL-SIGNAL PULSE RESPONSE (AVCL = +1, CL = 25pF)
MAX4223-23
MAX4224/MAX4227/MAX4228 SMALL-SIGNAL PULSE RESPONSE (AVCL = +2)
MAX4223-24
+100mV INPUT -100mV GND
+100mV INPUT -100mV GND
+50mV INPUT -50mV GND
+100mV OUTPUT -100mV TIME (10ns/div) GND
+100mV OUTPUT -100mV TIME (10ns/div)
+100mV GND OUTPUT -100mV TIME (10ns/div) GND
MAX4224/MAX4227/MAX4228 SMALL-SIGNAL PULSE RESPONSE (AVCL = +2, CL = 10pF)
MAX4223-25
MAX4223/MAX4225/MAX4226 LARGE-SIGNAL PULSE RESPONSE (AVCL = +1)
MAX4223-26
MAX4223/MAX4225/MAX4226 LARGE-SIGNAL PULSE RESPONSE (AVCL = +1, CL = 25pF)
MAX4223-27
+50mV INPUT -50mV GND
+2V INPUT -2V GND
+2V INPUT -2V GND
+100mV OUTPUT -100mV TIME (10ns/div) GND
+2V OUTPUT -2V TIME (10ns/div)
+2V GND OUTPUT -2V TIME (10ns/div) GND
MAX4224/MAX4227/MAX4228 LARGE-SIGNAL PULSE RESPONSE (AVCL = +2)
MAX4223-28
MAX4224/MAX4227/MAX4228 LARGE-SIGNAL PULSE RESPONSE (AVCL = +2,CL = 10pF)
MAX4223-29
MAX4224/MAX4227/MAX4228 LARGE-SIGNAL PULSE RESPONSE (AVCL = +5)
MAX4223-30
+1V INPUT -1V GND
+1V INPUT -1V GND
+400mV INPUT -400mV GND
+2V OUTPUT -2V TIME (10ns/div) GND
+2V OUTPUT -2V TIME (10ns/div)
+2V GND OUTPUT -2V TIME (10ns/div) GND
_______________________________________________________________________________________
7
1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown MAX4223-MAX4228
____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, RL = 100, TA = +25C, unless otherwise noted.)
POWER-SUPPLY CURRENT PER AMPLIFIER vs. TEMPERATURE
MAX4223-31
INPUT BIAS CURRENT vs. TEMPERATURE
MAX4223-32
SHORT-CIRCUIT OUTPUT CURRENT vs. TEMPERATURE
MAX4223-33
8 7 6 CURRENT (mA) 5 4 3 2 1 0 -50 -25 0 25 50 75 SHUTDOWN MODE NORMAL MODE
5
170
4 CURRENT (A) CURRENT (mA)
160 SINKING
3 IB2 IB+ 1
150
140
SOURCING
130
0 100 -50 -25 0 25 50 75 100 TEMPERATURE (C) TEMPERATURE (C)
120 -50 -25 0 25 50 75 100 TEMPERATURE (C)
POSITIVE OUTPUT SWING vs. TEMPERATURE
MAX4223-34
NEGATIVE OUTPUT SWING vs. TEMPERATURE
MAX4223-35
4.5 4.0 POSITIVE OUTPUT SWING (V) 3.5 3.0 2.5 2.0 1.5 1.0 -50 -25 0 25 50 75 RL = OPEN
-1.0 -1.5 NEGATIVE OUTPUT SWING (V) -2.0 -2.5 RL = 50 -3.0 -3.5 -4.0 -4.5
RL = 50
RL = OPEN
100
-50
-25
0
25
50
75
100
TEMPERATURE (C)
TEMPERATURE (C)
8
_______________________________________________________________________________________
1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown
______________________________________________________________Pin Description
PIN MAX4223/MAX4224 SOT23 -- 1 2 3 4 SO 1, 5 6 4 3 2 MAX4225 MAX4227 SO -- -- 4 -- -- MAX4226/MAX4228 MAX -- -- 4 -- -- SO 5, 7, 8, 10 -- 4 -- -- N.C. OUT VEE IN+ INNo Connect. Not internally connected. Tie to GND for optimum AC performance. Amplifier Output Negative Power-Supply Voltage. Connect to -5V. Amplifier Noninverting Input Amplifier Inverting Input Amplifier Shutdown. Connect to +5V for normal operation. Connect to GND for lowpower shutdown. Positive Power-Supply Voltage. Connect to +5V. Amplifier A Output Amplifier A Inverting Input Amplifier A Noninverting Input Amplifier B Noninverting Input Amplifier B Inverting Input Amplifier B Output Amplifier A Shutdown Input. Connect to +5V for normal operation. Connect to GND for low-power shutdown mode. Amplifier B Shutdown Input. Connect to +5V for normal operation. Connect to GND for low-power shutdown mode. NAME FUNCTION FUNCTION
MAX4223-MAX4228
5
8
--
--
--
SHDN
6 -- -- -- -- -- --
7 -- -- -- -- -- --
8 1 2 3 5 6 7
10 1 2 3 7 8 9
14 1 2 3 11 12 13
VCC OUTA INAINA+ INB+ INBOUTB
--
--
--
5
6
SHDNA
--
--
--
6
9
SHDNB
_______________________________________________________________________________________
9
1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown MAX4223-MAX4228
_______________Detailed Description
The MAX4223-MAX4228 are ultra-high-speed, lowpower, current-feedback amplifiers featuring -3dB bandwidths up to 1GHz, 0.1dB gain flatness up to 300MHz, and very low differential gain and phase errors of 0.01% and 0.02, respectively. These devices operate on dual 5V or 3V power supplies and require only 6mA of supply current per amplifier. The MAX4223/MAX4225/MAX4226 are optimized for closed-loop gains of +1 (0dB) or more and have -3dB bandwidths of 1GHz. The MAX4224/MAX4227/ MAX4228 are optimized for closed-loop gains of +2 (6dB) or more, and have -3dB bandwidths of 600MHz (1.2GHz gain-bandwidth product). The current-mode feedback topology of these amplifiers allows them to achieve slew rates of up to 1700V/s with corresponding large signal bandwidths up to 330MHz. Each device in this family has an output that is capable of driving a minimum of 60mA of output current to 2.5V.
RG RF
IN-
RINTZ +1 OUT
+1 IN+
VIN
MAX4223 MAX4224 MAX4225 MAX4226 MAX4227 MAX4228
Theory of Operation
Since the MAX4223-MAX4228 are current-feedback amplifiers, their open-loop transfer function is expressed as a transimpedance: VOUT or TZ IIN - The frequency behavior of this open-loop transimpedance is similar to the open-loop gain of a voltage-feedback amplifier. That is, it has a large DC value and decreases at approximately 6dB per octave. Analyzing the current-feedback amplifier in a gain configuration (Figure 1) yields the following transfer function: TZ S VOUT =G x VIN TZ S + G x RIN - + RF R where G = A V = 1 + F . RG
Figure 1. Current-Feedback Amplifier
Low-Power Shutdown Mode
The MAX4223/MAX4224/MAX4226/MAX4228 have a shutdown mode that is activated by driving the SHDN input low. When powered from 5V supplies, the SHDN input is compatible with TTL logic. Placing the amplifier in shutdown mode reduces quiescent supply current to 350A typical, and puts the amplifier output into a highimpedance state (100k typical). This feature allows these devices to be used as multiplexers in wideband systems. To implement the mux function, the outputs of multiple amplifiers can be tied together, and only the amplifier with the selected input will be enabled. All of the other amplifiers will be placed in the low-power shutdown mode, with their high output impedance presenting very little load to the active amplifier output. For gains of +2 or greater, the feedback network impedance of all the amplifiers used in a mux application must be considered when calculating the total load on the active amplifier output.
()
()
At low gains, (G x RIN-) << RF . Therefore, unlike traditional voltage-feedback amplifiers, the closed-loop bandwidth is essentially independent of the closedloop gain. Note also that at low frequencies, TZ >> [(G x RIN-) + RF], so that: VOUT R = G = 1+ F VIN RG
__________Applications Information
Layout and Power-Supply Bypassing
The MAX4223-MAX4228 have an extremely high bandwidth, and consequently require careful board layout, including the possible use of constant-impedance microstrip or stripline techniques.
10
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1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown
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. The ground plane should be as free of voids as possible, with one exception: the inverting input pin (IN-) should have as low a capacitance to ground as possible. This means that there should be no ground plane under IN- or under the components (RF and RG) connected to it. With multilayer boards, locate the ground plane on a layer that incorporates no signal or power traces. Whether or not a constant-impedance board is used, it is best to observe the following guidelines when designing the board: 1) Do not use wire-wrapped boards (they are too inductive) or breadboards (they are too capacitive). 2) Do not use IC sockets. IC sockets increase reactance. 3) Keep signal lines as short and straight as possible. Do not make 90 turns; round all corners. 4) Observe high-frequency bypassing techniques to maintain the amplifier's accuracy and stability. 5) In general, surface-mount components have shorter bodies and lower parasitic reactance, giving better high-frequency performance than through-hole components. The bypass capacitors should include a 10nF ceramic, surface-mount capacitor between each supply pin and the ground plane, located as close to the package as possible. Optionally, place a 10F tantalum capacitor at the power-supply pins' point of entry to the PC board to ensure the integrity of incoming supplies. The powersupply trace should lead directly from the tantalum capacitor to the VCC and VEE pins. To minimize parasitic inductance, keep PC traces short and use surfacemount components. The N.C. pins should be connected to a common ground plane on the PC board to minimize parasitic coupling. If input termination resistors and output back-termination resistors are used, they should be surface-mount types, and should be placed as close to the IC pins as possible. Tie all N.C. pins to the ground plane to minimize parasitic coupling.
Choosing Feedback and Gain Resistors
As with all current-feedback amplifiers, the frequency response of these devices depends critically on the value of the feedback resistor RF. RF combines with an internal compensation capacitor to form the dominant pole in the feedback loop. Reducing R F 's value increases the pole frequency and the -3dB bandwidth, but also increases peaking due to interaction with other nondominant poles. Increasing R F 's value reduces peaking and bandwidth. Table 1 shows optimal values for the feedback resistor (RF) and gain-setting resistor (RG) for the MAX4223- MAX4228. Note that the MAX4224/MAX4227/MAX4228 offer superior AC performance for all gains except unity gain (0dB). These values provide optimal AC response using surface-mount resistors and good layout techniques. Maxim's high-speed amplifier evaluation kits provide practical examples of such layout techniques. Stray capacitance at IN- causes feedback resistor decoupling and produces peaking in the frequencyresponse curve. Keep the capacitance at IN- as low as possible by using surface-mount resistors and by avoiding the use of a ground plane beneath or beside these resistors and the IN- pin. Some capacitance is unavoidable; if necessary, its effects can be counteracted by adjusting RF. Use 1% resistors to maintain consistency over a wide range of production lots.
MAX4223-MAX4228
Table 1. Optimal Feedback Resistor Networks
GAIN (V/V) GAIN (dB) RF () RG () -3dB BW (MHz) 1000 380 235 600 400 195 0.1dB BW (MHz) 300 115 65 200 90 35
MAX4223/MAX4225/MAX4226 1 2 5 2 5 10 0 6 14 6 14 20 560* 200 100 470 240 130 Open 200 25 470 62 15
MAX4224/MAX4227/MAX4228
*For the MAX4223EUT, this optimal value is 470.
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1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown MAX4223-MAX4228
DC and Noise Errors
The MAX4223-MAX4228 output offset voltage, V OUT (Figure 2), can be calculated with the following equation: VOUT = VOS x 1 + RF /RG + IB + x RS RF x 1 + + IB - x RF RG where: VOS = input offset voltage (in volts) 1 + RF / RG = amplifier closed-loop gain (dimensionless) IB+ = input bias current (in amps) IB- = inverting input bias current (in amps) RG = gain-setting resistor (in ) RF = feedback resistor (in ) RS = source resistor (in ) The following equation represents output noise density:
RF en(OUT) = 1 + x RG
IBRG RF
(
)
INOUT VOUT IB+ IN+ RS
MAX4223 MAX4224 MAX4225 MAX4226 MAX4227 MAX4228
Figure 2. Output Offset Voltage
(in +
x RS
)2
+ in - x RF || RG
[
(
)] +(en )2
2
With a 600MHz system bandwidth, this calculates to 250V RMS (approximately 1.5mVp-p, using the sixsigma calculation).
Communication Systems
Nonlinearities of components used in a communication system produce distortion of the desired output signal. Intermodulation distortion (IMD) is the distortion that results from the mixing of two input signals of different frequencies in a nonlinear system. In addition to the input signal frequencies, the resulting output signal contains new frequency components that represent the sum and difference products of the two input frequencies. If the two input signals are relatively close in frequency, the third-order sum and difference products will fall close to the frequency of the desired output and will therefore be very difficult to filter. The third-order intercept (IP3) is defined as the power level at which the amplitude of the largest third-order product is equal to the power level of the desired output signal. Higher third-order intercept points correspond to better linearity of the amplifier. The MAX4223-MAX4228 have a typical IP3 value of 42dBm, making them excellent choices for use in communications systems.
where: in = input noise current density (in pA/Hz) en = input noise voltage density (in nV/Hz) The MAX4223-MAX4228 have a very low, 2nV/Hz noise voltage. The current noise at the noninverting input (in+) is 3pA/Hz, and the current noise at the inverting input (in-) is 20pA/Hz. An example of DC-error calculations, using the MAX4224 typical data and the typical operating circuit with RF = RG = 470 (RF || RG = 235) and RS = 50, gives: VOUT = [5 x 10-4 x (1 + 1)] + [2 x 10-6 x 50 x (1 + 1)] + [4 x 10-6 x 470] VOUT = 3.1mV Calculating total output noise in a similar manner yields the following:
en(OUT) = 1 + 1 x 3 2 -12 x 10 x 50 +
2 20 x 10 -12 x 235 + 2 x 10 -9 2
(
)
ADC Input Buffers
Input buffer amplifiers can be a source of significant errors in high-speed ADC applications. The input buffer is usually required to rapidly charge and discharge the ADC's input, which is often capacitive (see the section Driving Capacitive Loads). In addition, a high-speed ADC's input impedance often changes very rapidly during the conversion cycle, requiring an amplifier with
en(OUT) = 10.2nV / Hz
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1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown
very low output impedance at high frequencies to maintain measurement accuracy. The combination of high speed, fast slew rate, low noise, and low distortion makes the MAX4223-MAX4228 ideally suited for use as buffer amplifiers in high-speed ADC applications. small gain error. At higher capacitive loads, AC performance is limited by the interaction of load capacitance with the isolation resistor.
MAX4223-MAX4228
Maxim's High-Speed Evaluation Board Layout
Figures 7 and 8 show a suggested layout for Maxim's high-speed, single-amplifier evaluation boards. These boards were developed using the techniques described above. The smallest available surface-mount resistors were used for the feedback and back-termination resistors to minimize the distance from the IC to these resistors, thus 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 1/4 of the wavelength of the highest frequency of interest, constant-impedance traces should be used. Fully assembled evaluation boards are available for the MAX4223 in an SO-8 package.
Video Line Driver
The MAX4223-MAX4228 are optimized to drive coaxial transmission lines when the cable is terminated at both ends, as shown in Figure 3. Note that cable frequency response may cause variations in the signal's flatness.
Driving Capacitive Loads
A correctly terminated transmission line is purely resistive and presents no capacitive load to the amplifier. Although the MAX4223-MAX4228 are optimized for AC performance and are not designed to drive highly capacitive loads, they are capable of driving up to 25pF without excessive ringing. Reactive loads decrease phase margin and may produce excessive ringing and oscillation (see Typical Operating Characteristics). Figure 4's circuit reduces the effect of large capacitive loads. The small (usually 5 to 20) isolation resistor RISO, placed before the reactive load, prevents ringing and oscillation at the expense of a
RG
RF
RG
RF
INOUT 75 CABLE IN+ RT 75 75 CABLE INRISO
OUT RT 75
RT 75
MAX4223 MAX4224 MAX4225 MAX4226 MAX4227 MAX4228
IN+
CL
RL
MAX4223 MAX4224 MAX4225 MAX4226 MAX4227 MAX4228 Figure 4. Using an Isolation Resistor (RISO) for High Capacitive Loads
Figure 3. Video Line Driver
______________________________________________________________________________________
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1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown MAX4223-MAX4228
AC Testing/Performance
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 evaluation 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 MAX4223-MAX4228 AC specifications are derived from worst-case design simulations combined with a sample characterization of 100 units. The AC performance distributions along with the worst-case simulation limits are shown in Figures 5 and 6. These distributions are repeatable provided that proper board layout and power-supply bypassing are used (see Layout and Power-Supply Bypassing section).
MAX4223-fig5a
100 UNITS 40 NUMBER OF UNITS SIMULATION LOWER LIMIT
100 UNITS 40 NUMBER OF UNITS SIMULATION LOWER LIMIT
30
30
20
20
10
10
0-600
650-700
750-800
850-900
950-1000
1050-1100
1150-1200
1250-1300
1350-1400
1450-1500
0
0 0-60 80-100 120-140 160-180 200-220 240-260 280-300 320-340 360-380 875-900 400-420 925-950
MAX4223-fig5d
-3dB BANDWIDTH (MHz)
0.1dB BANDWIDTH (MHz)
Figure 5a. MAX4223 -3dB Bandwidth Distribution
Figure 5b. MAX4223 0.1dB Bandwidth Distribution
MAX4223-fig5c
50 100 UNITS 40 NUMBER OF UNITS SIMULATION LOWER LIMIT
50 100 UNITS 40 NUMBER OF UNITS SIMULATION LOWER LIMIT
30
30
20
20
10
10
0-800
825-850
875-900
925-950
975-1000
1025-1050
1075-1100
1125-1150
1175-1200
1225-1250
0-500
525-550
575-600
625-650
675-700
725-750
775-800
RISING-EDGE SLEW RATE (V/s)
FALLING-EDGE SLEW RATE (V/s)
Figure 5c. MAX4223 Rising-Edge Slew-Rate Distribution
14
Figure 5d. MAX4223 Falling-Edge Slew-Rate Distribution
______________________________________________________________________________________
825-850
0
0
MAX4223-fig5b
50
50
1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown MAX4223-MAX4228
MAX4223-fig6a
100 UNITS 40 NUMBER OF UNITS SIMULATION LOWER LIMIT
100 UNITS 40 NUMBER OF UNITS SIMULATION LOWER LIMIT
30
30
20
20
10
10
0-200
250-300
350-400
450-500
550-600
650-700
750-800
850-900
950-1000
1050-1100
0
0 0-40 60-80 100-120 140-160 180-200 220-240 260-280 300-320 340-360 1475-1500 380-400 1525-1550
MAX4223-fig6d
-3dB BANDWIDTH (MHz)
0.1dB BANDWIDTH (MHz)
Figure 6a. MAX4224 -3dB Bandwidth Distribution
Figure 6b. MAX4224 0.1dB Bandwidth Distribution
100 UNITS 40 NUMBER OF UNITS SIMULATION LOWER LIMIT
MAX4223-fig6c
50
50 100 UNITS 40 NUMBER OF UNITS SIMULATION LOWER LIMIT
30
30
20
20
10
10
0-1400
1425-1450
1475-1500
1525-1550
1575-1600
1625-1650
1675-1700
1725-1750
1775-1800
1825-1850
0-1100
1125-1150
1175-1200
1225-1250
1275-1300
1325-1350
1375-1400
RISING-EDGE SLEW RATE (V/s)
FALLING-EDGE SLEW RATE (V/s)
Figure 6c. MAX4224 Rising-Edge Slew-Rate Distribution
Figure 6d. MAX4224 Falling-Edge Slew-Rate Distribution
______________________________________________________________________________________
1425-1450
0
0
MAX4223-fig6b
50
50
15
1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown MAX4223-MAX4228
Figure 7a. Maxim SOT23 High-Speed Evaluation Board Component Placement Guide--Component Side
Figure 7b. Maxim SOT23 High-Speed Evaluation Board PC Board Layout--Component Side
16
Figure 7c. Maxim SOT23 High-Speed Evaluation Board PC Board Layout--Back Side
______________________________________________________________________________________
1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown MAX4223-MAX4228
Figure 8a. Maxim SO-8 High-Speed Evaluation Board Component Placement Guide--Component Side
Figure 8b. Maxim SO-8 High-Speed Evaluation Board PC Board Layout--Component Side
Figure 8c. Maxim SO-8 High-Speed Evaluation Board PC Board Layout--Back Side
17
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1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown MAX4223-MAX4228
_____________________________________________Pin Configurations (continued)
TOP VIEW
MAX4223 MAX4224
N.C. 1 IN- 2 IN+ 3 VEE 4 8 7 6 5 SHDN VCC OUT N.C. OUTA 1 INA- 2 INA+ 3 VEE 4
MAX4225 MAX4227
8 7 6 5 VCC OUTB INBINB+
SO
SO
MAX4226 MAX4228
OUTA 1 INAINA+ VEE SHDNA 2 3 4 5 10 VCC 9 8 7 6 OUTB INBINB+ SHDNB OUTA 1 INA- 2 INA+ 3 VEE 4 N.C. 5 SHDNA 6 N.C. 7
MAX4226 MAX4228
14 VCC 13 OUTB 12 INB11 INB+ 10 N.C. 9 8 SHDNB N.C.
MAX
SO
18
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1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown
_Ordering Information (continued)
PART TEMP. RANGE PINPACKAGE 6 SOT23 8 SO 8 SO 10 MAX 14 SO 8 SO 10 MAX 14 SO SOT TOP MARK AAAE -- -- -- -- -- -- --
___________________Chip Information
MAX4223/MAX4224 TRANSISTOR COUNT: 87 MAX4225-MAX4228 TRANSISTOR COUNT: 171 SUBSTRATE CONNECTED TO VEE
MAX4223-MAX4228
MAX4224EUT-T -40C to +85C MAX4224ESA MAX4225ESA MAX4226EUB MAX4226ESD MAX4227ESA MAX4228EUB MAX4228ESD -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C
______________________________________________________________________________________
19
1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown MAX4223-MAX4228
________________________________________________________Package Information
10LUMAXB.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.
20 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
6LSOT.EPS

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