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EL2386
Data Sheet June 24, 2004 FN7155.1
250MHz Triple Current Feedback Amplifier with Disable
The EL2386 is a triple currentfeedback operational amplifier which achieves a -3dB bandwidth of 250MHz at a gain of +1 while consuming only 3mA of supply current per amplifier. It will operate with dual supplies ranging from 1.5V to 6V, or from single supplies ranging from +3V to +12V. The EL2386 also includes a disable/power-down feature which reduces current consumption to 0mA while placing the amplifier output in a high impedance state. In spite of its low supply current, the EL2386 can output 55mA while swinging to 4V on 5V supplies. These attributes make the EL2386 an excellent choice for low power and/or low voltage cable-driver, HDSL, or RGB applications. For single and dual applications, consider the EL2186/ EL2286. For single, dual, and quad applications without disable, consider the EL2180, EL2280, or EL2480, all in industry-standard pinouts. The EL2180 also is available in the tiny SOT-23 package, which is 28% the size of an SO8 package. For lower power applications where speed is still a concern, consider the EL2170/EL2176 family which also comes in similar single, dual, and quad configurations. The EL2170/EL2176 family provides a -3dB bandwidth of 70MHz while consuming 1mA of supply current per amplifier.
Features
* Triple amplifier topology * 3mA supply current (per amplifier) * 250MHz -3dB bandwidth * Low cost * Fast disable * Powers down to 0mA * Single- and dual-supply operation down to 1.5V * 0.05%/0.05 diff. gain/diff. phase into 150 * 1200V/s slew rate * Large output drive current: 55mA * Available in single (EL2186) and dual (EL2286) * Non power-down versions available in single, dual, and quad (EL2180, EL2280, EL2480) * Lower power EL2170/EL2176 family also available (1mA/70MHz) in single, dual, and quad * Pb-free available
Applications
* Low power/battery applications * HDSL amplifiers
Ordering Information
PART NUMBER EL2386CS EL2386CS-T7 PACKAGE 16-Pin SO (0.150") 16-Pin SO (0.150") TAPE & REEL 7" 13" 7" 13" PKG. DWG. # MDP0027 MDP0027 MDP0027 MDP0027 MDP0027 MDP0027
* Video amplifiers * Cable drivers * RGB amplifiers * Test equipment amplifiers * Current to voltage converters * Multiplexing * Video broadcast equipment
EL2386CS-T13 16-Pin SO (0.150") EL2386CSZ (Note) 16-Pin SO (0.150") (Pb-Free)
EL2386CSZ-T7 16-Pin SO (0.150") (Note) (Pb-Free) EL2386CSZT13 (Note) 16-Pin SO (0.150") (Pb-Free)
Pinout
EL2386 (16-PIN SO) TOP VIEW
NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which is compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J Std-020B.
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2004. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners. Manufactured under U.S. Patent No. 5,418,495
EL2386
Absolute Maximum Ratings (TA = 25C)
Voltage between VS+ and VS- . . . . . . . . . . . . . . . . . . . . . . . . +12.6V Common-Mode Input Voltage . . . . . . . . . . . . . . . . . . . . . VS- to VS+ Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6V Current into +IN or -IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.5mA Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . See Curves Operating Ambient Temperature Range . . . . . . . . . .-40C to +85C Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 150C Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60mA
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
DC Electrical Specifications
PARAMETER VOS TCVOS dVOS +IIN d+IIN -IIN d-IIN CMRR -ICMR PSRR -IPSR ROL +RIN +CIN CMIR VO Input Offset Voltage
VS = 5V, RL= 150, ENABLE = 0V, TA = 25C unless otherwise specified. CONDITIONS MIN TYP 2.5 Measured from TMIN to TMAX 5 0.5 1.5 20 16 2 VCM = 3.5V VCM = 3.5V VS = 4V to 6V VS = 4V to 6V VOUT = 2.5V VCM = 3.5V 120 0.5 60 45 50 5 70 1 300 2 1.2 3.5 VS = 5V VS = +5V single-supply, high VS = +5V single-supply, low 3.5 4.0 4.0 4.0 0.3 50 ENABLE = 2.0V 55 3 0 4.4 45 85 -0.04 -53 4.5 2.0 6 50 15 30 40 15 MAX 15 UNIT mV V/C mV A nA A A dB A/V dB A/V k M pF V V V V mA mA A pF k A A V V
DESCRIPTION
Average Input Offset Voltage Drift VOS Matching +Input Current +IIN Matching -Input Current -IIN Matching Common Mode Rejection Ratio -Input Current Common Mode Rejection Power Supply Rejection Ratio -Input Current Power Supply Rejection Transimpedance +Input Resistance +Input Capacitance Common Mode Input Range Output Voltage Swing
IO IS IS(DIS) COUT(DIS) RIN-EN IIH-EN IIL-EN VDIS VEN
Output Current Supply Current - Enabled (per amplifier)
Supply Current - Disabled (per amplifier) ENABLE = 4.5V Output Capacitance - Disabled ENABLE Pin Input Resistance ENABLE Pin Input Current - High ENABLE Pin Input Current - Low Minimum Voltage at ENABLE to Disable Maximum Voltage at ENABLE to Enable ENABLE = 4.5V ENABLE = 2.0V to 4.5V ENABLE = 4.5V ENABLE = 0V
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EL2386
AC Electrical Specifications
PARAMETER BW -3dB Bandwidth VS = 5V, RF = RG = 750, RL= 150W, ENABLE = 0V, TA = 25C unless otherwise specified. CONDITIONS AV = +1 AV = +2 BW SR tR, tF tPD OS tS dG dP dG dP tON tOFF CS NOTES: 1. DC offset from 0V to 0.714V, AC amplitude 286mVP-P, f = 3.58MHz. 2. Measured from the application of the logic signal until the output voltage is at the 50% point between initial and final values. 0.1dB Bandwidth Slew Rate Rise and Fall Time Propagation Delay Overshoot 0.1% Settling Differential Gain (Note 1) Differential Phase (Note 1) Differential Gain (Note 1) Differential Phase (Note 1) Turn-On Time (Note 2) Turn-Off Time (Note 2) Channel Separation AV = +2 VOUT = 2.5V, measured at 1.25V VOUT = 500mV VOUT = 500mV VOUT = 500mV VOUT = 2.5V, AV = -1 AV = +2, RL = 150 AV = +2, RL = 150 AV = +1, RL = 500 AV = +1, RL = 500 AV = +2, VIN = +1V, RL = 150 AV = +2, VIN = +1V, RL = 150 f = 5MHz 600 MIN TYP 250 180 50 1200 1.5 1.5 3.0 15 0.05 0.05 0.01 0.01 40 800 85 100 2000 MAX UNIT MHz MHz MHz V/s ns ns % ns % % ns ns dB
DESCRIPTION
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EL2386 Test Circuit (per Amplifier)
Simplified Schematic (per Amplifier)
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EL2386 Typical Performance Curves
NON-INVERTING REQUENCY RESPONSE (GAIN) NON-INVERTING FREQUENCY RESPONSE (PHASE) FREQUENCY RESPONSE FOR VARIOUS RF AND RG
INVERTING FREQUENCY RESPONSE (GAIN)
INVERTING FREQUENCY RESPONSE (PHASE)
FREQUENCY RESPONSE FOR VARIOUS RL AND CL
TRANSIMPEDANCE (ROL) vs FREQUENCY
PSRR AND CMRR vs FREQUENCY
FREQUENCY RESPONSE FOR VARIOUS CIN-
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EL2386 Typical Performance Curves
VOLTAGE AND CURRENT NOISE vs FREQUENCY
(Continued)
2ND AND 3RD HARMONIC DISTORTION vs FREQUENCY
OUTPUT VOLTAGE SWING vs FREQUENCY
-3dB BANDWIDTH AND PEAKING vs SUPPLY VOLTAGE FOR VARIOUS NON-INVERTING GAINS
-3DB BANDWIDTH AND PEAKING vs SUPPLY VOLTAGE FOR VARIOUS INVERTING GAINS
OUTPUT VOLTAGE SWING vs SUPPLY VOLTAGE
SUPPLY CURRENT vs SUPPLY VOLTAGE
COMMON-MODE INPUT RANGE vs SUPPLY VOLTAGE
SLEW RATE vs SUPPLY VOLTAGE
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EL2386 Typical Performance Curves
INPUT BIAS CURRENT vs DIE TEMPERATURE
(Continued)
SHORT-CIRCUIT CURRENT vs DIE TEMPERATURE
TRANSIMPEDANCE (ROL) vs DIE TEMPERATURE
-3dB BANDWIDTH AND PEAKING vs DIE TEMPERATURE FOR VARIOUS NON-INVERTING GAINS
-3dB BANDWIDTH vs DIE TEMPERATURE FOR VARIOUS INVERTING GAINS
INPUT OFFSET VOLTAGE vs DIE TEMPERATURE
SUPPLY CURRENT vs DIE TEMPERATURE
INPUT VOLTAGE RANGE vs DIE TEMPERATURE
SLEW RATE vs DIE TEMPERATURE
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EL2386 Typical Performance Curves
DIFFERENTIAL GAIN AND PHASE vs DC INPUT VOLTAGE AT 3.58MHZ
(Continued)
DIFFERENTIAL GAIN AND PHASE vs DC INPUT VOLTAGE AT 3.58MHZ
SETTLING TIME vs SETTLING ACCURACY
16-PIN SO MAXIMUM POWER DISSIPATION vs AMBIENT TEMPERATURE
CHANNEL TO CHANNEL ISOLATION vs FREQUENCY
SMALL-SIGNAL STEP RESPONSE
LARGE-SIGNAL STEP RESPONSE
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EL2386 Applications Information
Product Description
The EL2386 is a current-feedback operational amplifier that offers a wide -3dB bandwidth of 250MHz, a low supply current of 3mA per amplifier and the ability to power down to 0mA. It also features high output current drive. The EL2386 can output 55mA per amplifier. The EL2386 works with supply voltages ranging from a single 3V to 6V, and it is also capable of swinging to within 1V of either supply on the input and the output. Because of its current-feedback topology, the EL2386 does not have the normal gainbandwidth product associated with voltage-feedback operational amplifiers. This allows its -3dB bandwidth to remain relatively constant as closed-loop gain is increased. This combination of high bandwidth and low power, together with aggressive pricing make the EL2386 the ideal choice for many low-power/high-bandwidth applications such as portable computing, HDSL, and video processing. For single and dual applications, consider the EL2186/EL2286. For single, dual and quad applications without disable, consider the EL2180, EL2280, or EL2480, all in industry standard pin outs. The EL2180 also is available in the tiny SOT-23 package, which is 28% the size of an SO8 package. For lower power applications where speed is still a concern, consider the EL2170/EL2176 family which also comes in similar single, dual and quad configurations with 70MHz of bandwidth while consuming 1mA of supply current per amplifier.
Disable/Power-Down
The EL2386 amplifier can be disabled, placing its output in a high-impedance state. When disabled, the supply current is reduced to 0mA. The EL2386 is disabled when its ENABLE pin is floating or pulled up to within 0.5V of the positive supply. Similarly, the amplifier is enabled by pulling its ENABLE pin at least 3V below the positive supply. For 5V supplies, this means that an EL2386 amplifier will be enabled when ENABLE is at 2V or less, and disabled when ENABLE is above 4.5V. Although the logic levels are not standard TTL, this choice of logic voltages allows the EL2386 to be enabled by tying ENABLE to ground, even in +3V single-supply applications. The ENABLE pin can be driven from CMOS outputs or open-collector TTL. When enabled, supply current does vary somewhat with the voltage applied at ENABLE. For example, with the supply voltages of the EL2186 at 5V, if ENABLE is tied to -5V (rather than ground) the supply current will increase about 15% to 3.45mA.
Capacitance at the Inverting Input
Any manufacturer's high-speed voltage- or current-feedback amplifier can be affected by stray capacitance at the inverting input. For inverting gains this parasitic capacitance has little effect because the inverting input is a virtual ground, but for non-inverting gains this capacitance (in conjunction with the feedback and gain resistors) creates a pole in the feedback path of the amplifier. This pole, if low enough in frequency, has the same destabilizing effect as a zero in the forward open-loop response. The use of large value feedback and gain resistors further exacerbates the problem by further lowering the pole frequency. The experienced user with a large amount of PC board layout experience may find in rare cases that the EL2386 has less bandwidth than expected. In this case, the inverting input may have less parasitic capacitance than expected. The reduction of feedback resistor values (or the addition of a very small amount of external capacitance at the inverting input, e. g. 0.5pF) will increase bandwidth as desired. Please see the curves for Frequency Response for Various RF and RG, and Frequency Response for Various CIN-.
Power Supply Bypassing and Printed Circuit Board Layout
As with any high-frequency device, good printed circuit board layout is necessary for optimum performance. Ground plane construction is highly recommended. Pin lengths should be as short as possible. The power supply pins must be well bypassed to reduce the risk of oscillation. The combination of a 4.7F tantalum capacitor in parallel with a 0.1F capacitor has been shown to work well when placed at each supply pin. For single supply operation, where pin 3 (VS-) is connected to the ground plane, a single 4.7F tantalum capacitor in parallel with a 0.1F ceramic capacitor across pins 14 and 3 will suffice. For good AC performance, parasitic capacitance should be kept to a minimum especially at the inverting input (see the Capacitance at the Inverting Input section). Ground plane construction should be used, but it should be removed from the area near the inverting input to minimize any stray capacitance at that node. Carbon or Metal-Film resistors are acceptable with the Metal-Film resistors giving slightly less peaking and bandwidth because of their additional series inductance. Use of sockets, particularly for the SO package should be avoided if possible. Sockets add parasitic inductance and capacitance which will result in some additional peaking and overshoot.
Feedback Resistor Values
The EL2386 has been designed and specified at gains of +1 and +2 with RF = 750. This value of feedback resistor gives 250MHz of -3dB bandwidth at AV = +1 with about 2.5dB of peaking, and 180MHz of -3dB bandwidth at AV = +2 with about 0.1dB of peaking. Since the EL2386 is a currentfeedback amplifier, it is also possible to change the value of RF to get more bandwidth. As seen in the curve of Frequency Response For Various RF and RG, bandwidth and peaking can be easily modified by varying the value of the feedback resistor. Because the EL2386 is a current-feedback amplifier, its gain-bandwidth product is not a constant for different closed-
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EL2386
loop gains. This feature actually allows the EL2386 to maintain about the same -3dB bandwidth, regardless of closed-loop gain. However, as closed-loop gain is increased, bandwidth decreases slightly while stability increases. Since the loop stability is improving with higher closed-loop gains, it becomes possible to reduce the value of RF below the specified 750 and still retain stability, resulting in only a slight loss of bandwidth with increased closed-loop gain. output current. This output drive level is unprecedented in amplifiers running at these supply currents. With a minimum 50mA of output drive, the EL2386 is capable of driving 50 loads to 2.5V, making it an excellent choice for driving multiple video loads in RGB applications.
Driving Cables and Capacitive Loads
When used as a cable driver, double termination is always recommended for reflection-free performance. For those applications, the back-termination series resistor will decouple the EL2386 from the cable and allow extensive capacitive drive. However, other applications may have high capacitive loads without a back-termination resistor. In these applications, a small series resistor (usually between 5 and 50) can be placed in series with the output to eliminate most peaking. The gain resistor (RG) can then be chosen to make up for any gain loss which may be created by this additional resistor at the output. In many cases it is also possible to simply increase the value of the feedback resistor (RF) to reduce the peaking.
Supply Voltage Range and Single-Supply Operation
The EL2386 has been designed to operate with supply voltages having a span of greater than 3V, and less than 12V. In practical terms, this means that the EL2386 will operate on dual supplies ranging from 1.5V to 6V. With a single-supply, the EL2386 will operate from +3V to +12V. As supply voltages continue to decrease, it becomes necessary to provide input and output voltage ranges that can get as close as possible to the supply voltages. The EL2386 has an input voltage range that extends to within 1V of either supply. So, for example, on a single +5V supply, the EL2386 has an input range which spans from 1V to 4V. The output range of the EL2386 is also quite large, extending to within 1V of the supply rail. On a 5V supply, the output is therefore capable of swinging from -4V to +4V. Single-supply output range is even larger because of the increased negative swing due to the external pull-down resistor to ground. On a single +5V supply, output voltage range is about 0.3V to 4V.
Current Limiting
The EL2386 has no internal current-limiting circuitry. If an output is shorted indefinitely, the power dissipation could easily increase such that the part will be destroyed. Maximum reliability is maintained if the output current never exceeds 60mA. A heat sink may be required to keep the junction temperature below absolute maximum when an output is shorted indefinitely.
Video Performance
For good video performance, an amplifier is required to maintain the same output impedance and the same frequency response as DC levels are changed at the output. This is especially difficult when driving a standard video load of 150, because of the change in output current with DC level. Until the EL2386, good Differential Gain could only be achieved by running high idle currents through the output transistors (to reduce variations in output impedance). These currents were typically comparable to the entire 3mA supply current of each EL2386 amplifier! Special circuitry has been incorporated in the EL2386 to reduce the variation of output impedance with current output. This results in dG and dP specifications of 0.05% and 0.05 while driving 150 at a gain of +2. Video Performance has also been measured with a 500 load at a gain of +1. Under these conditions, the EL2386 has dG and dP specifications of 0.01% and 0.01 respectively while driving 500 at AV = +1. For complete curves, see the Differential Gain and Differential Phase vs Input Voltage curves.
Multiplexing with the EL2386
The ENABLE pins on the EL2386 allow for multiplexing applications. Figure 1 shows an EL2386 with all 3 outputs tied together, driving a back terminated 75 video load. Three sine waves of varying amplitudes and frequencies are applied to the three inputs, while a 1 of 3 decoder selects one amplifier to be on at any given time. Figure 2 shows the resulting output wave form at VOUT. Switching is complete in about 100ns. Notice the outputs are tied directly together. De-coupling resistors at each output are not required or advised when multiplexing.
FIGURE 1.
Output Drive Capability
In spite of its low 3mA of supply current per amplifier, the EL2386 is capable of providing a minimum of 50mA of 10
EL2386
FIGURE 2.
Power Dissipation
With the high output drive capability of the EL2386, it is possible to exceed the 150C Absolute Maximum junction temperature under certain very high load current conditions. Generally speaking, when RL falls below about 25, it is important to calculate the maximum junction temperature (TJMAX) for the application to determine if power-supply voltages, load conditions, or package type need to be modified for the EL2386 to remain in the safe operating area. These parameters are calculated as follows:
T JMAX = T MAX + ( JA *n*PD MAX )
where: TMAX = Maximum ambient temperature JA = Thermal resistance of the package n = Number of amplifiers in the package PDMAX = Maximum power dissipation of each amplifier in the package PDMAX for each amplifier can be calculated as follows:
PD MAX = ( 2 x V *I SMAX ) + ( ( V S )-V OUTMAX )* ( V OUTMAX R L ) S
where: VS = Supply voltage ISMAX = Maximum supply current of 1 amplifier VOUTMAX = Max. output voltage of the application RL = Load resistance
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EL2386 EL2386 Macromodel
* EL2386C Macromodel * Revision A, July 1996 * AC characteristics used: Rf = Rg = 750 ohms * Pin numbers reflect a standard single opamp * Connections: +input * | -input * | | +Vsupply * | | | -Vsupply * | | | | output * | | | | | .subckt EL2386/EL 3 2 7 4 6 * * Input Stage * e1 10 0 3 0 1.0 vis 10 9 0V h2 9 12 vxx 1.0 r1 2 11 400 l1 11 12 25nH iinp 3 0 1.5A iinm 2 0 3A r12 3 0 2Meg * * Slew Rate Limiting * h1 13 0 vis 600 r2 13 14 1K d1 14 0 dclamp d2 0 14 dclamp * * High Frequency Pole * e2 30 0 14 0 0.00166666666 l3 30 17 150nH c5 17 0 0.8pF r5 17 0 165 * .subckt EL2360/ELIN+IN+IN+IN+IN+INININININ * Transimpedance Stage * g1 0 18 17 0 1.0 rol 18 0 450k cdp 18 0 0.675pF * * Output Stage * q1 4 18 19 qp q2 7 18 20 qn q3 7 19 21 qn q4 4 20 22 qp r7 21 6 4 r8 22 6 4 ios1 7 19 1mA ios2 20 4 1mA * * Supply Current * ips 7 4 0.2mA *
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EL2386 EL2386 Macromodel
(Continued)
* Error Terms * ivos 0 23 0.2mA vxx 23 0 0V e4 24 0 3 0 1.0 e5 25 0 7 0 1.0 e6 26 0 4 0 -1.0 r9 24 23 316 r10 25 23 3.2K r11 26 23 3.2K * * Models * .model qn npn(is=5e-15 bf=200 tf=0.1nS) .model qp pnp(is=5e-15 bf=200 tf=0.1nS) .model dclamp d(is=1e-30 ibv=0.266 + bv=0.71v n=4) .ends
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