NS ESIG WD E N FOR 362 5 DED MEN 5360, EL M O C L E E R SEE NOT ® Data Sheet Triple 300MHz Current Feedback Amplifier with Enable The EL5393A is a triple current feedback amplifier with a bandwidth of 300MHz. This makes these amplifiers ideal for today’s high speed video and monitor applications. EL5393A January 22, 2004 FN7195.1 Features • 300MHz -3dB bandwidth • 4mA supply current (per amplifier) • Single and dual supply operation, from 5V to 10V • Fast enable/disable With a supply current of just 4mA per amplifier and the ability to run from a single supply voltage from 5V to 10V, these amplifiers are also ideal for hand held, portable or battery powered equipment. • Available in 16-pin QSOP package The EL5393A also incorporates an enable and disable function to reduce the supply current to 100µA typical per amplifier. Allowing the CE pin to float or applying a low logic level will enable the amplifier. • High speed, 6mA, 600MHz product available (EL5192, EL5292, and EL5392) For applications where board space is critical, the EL5393A is offered in 16-pin QSOP package, as well as an industry standard 16-pin SO (0.150"). The EL5393A operates over the industrial temperature range of -40°C to +85°C. • Battery-powered equipment • Single (EL5193) and dual (EL5293) available • High speed, 1GHz product available (EL5191) Applications • Hand-held, portable devices • Video amplifiers • Cable drivers Ordering Information • RGB amplifiers PACKAGE TAPE & REEL PKG. NO. EL5393ACS 16-Pin SO (0.150") - MDP0027 EL5393ACS-T7 16-Pin SO (0.150") 7” MDP0027 • Current to voltage converters EL5393ACS-T13 16-Pin SO (0.150") 13” MDP0027 Pinout EL5393ACU 16-Pin QSOP - MDP0040 EL5393ACU-T7 16-Pin QSOP 7” MDP0040 EL5393ACU-T13 16-Pin QSOP 13” MDP0040 PART NUMBER • Test equipment • Instrumentation EL5393A [16-PIN SO (0.150”), QSOP] TOP VIEW INA+ 1 16 INA- 1 - CEA 2 VS- 3 CEB 4 INB+ 5 12 INB- NC 6 11 NC CEC 7 INC+ 8 + 15 OUTA 14 VS+ + - + - 13 OUTB 10 OUTC 9 INC- 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 © 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. EL5393A Absolute Maximum Ratings (TA = 25°C) Supply Voltage between VS+ and VS- . . . . . . . . . . . . . . . . . . . . . 11V Maximum Continuous Output Current . . . . . . . . . . . . . . . . . . . 50mA Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 125°C Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves Pin Voltages. . . . . . . . . . . . . . . . . . . . . . . . . VS- -0.5V to VS+ +0.5V Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . -65°C to +150°C Ambient Operating Temperature . . . . . . . . . . . . . . . . -40°C to +85°C 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 Electrical Specifications VS+ = +5V, VS- = -5V, RF = 750Ω for AV = 1, RF = 375Ω for AV = 2, RL = 150Ω, TA = 25°C unless otherwise specified. PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT AC PERFORMANCE BW -3dB Bandwidth AV = +1 300 MHz AV = +2 200 MHz 20 MHz 2200 V/µs BW1 0.1dB Bandwidth SR Slew Rate VO = -2.5V to +2.5V, AV = +2 tS 0.1% Settling Time VOUT = -2.5V to +2.5V, AV = -1 12 ns CS Channel Separation f = 5MHz 60 dB eN Input Voltage Noise 4.4 nV/√Hz iN- IN- Input Current Noise 17 pA/√Hz iN+ IN+ Input Current Noise 50 pA/√Hz dG Differential Gain Error (Note 1) AV = +2 0.03 % dP Differential Phase Error (Note 1) AV = +2 0.04 ° 1900 DC PERFORMANCE VOS Offset Voltage TCVOS Input Offset Voltage Temperature Coefficient ROL Transimpedance -10 Measured from TMIN to TMAX 1 10 mV 5 µV/°C 300 600 kΩ INPUT CHARACTERISTICS CMIR Common Mode Input Range ±3 ±3.3 V CMRR Common Mode Rejection Ratio 42 50 dB +IIN + Input Current -60 1 80 µA -IIN - Input Current -35 1 35 µA RIN Input Resistance 45 kΩ CIN Input Capacitance 0.5 pF OUTPUT CHARACTERISTICS RL = 150Ω to GND ±3.4 ±3.7 V RL = 1kΩ to GND ±3.8 ±4.0 V Output Current RL = 10Ω to GND 95 120 mA ISON Supply Current - Enabled No load, VIN = 0V 3 4 5 mA ISOFF Supply Current - Disabled No load, VIN = 0V 100 150 µA VO IOUT Output Voltage Swing SUPPLY 2 EL5393A Electrical Specifications VS+ = +5V, VS- = -5V, RF = 750Ω for AV = 1, RF = 375Ω for AV = 2, RL = 150Ω, TA = 25°C unless otherwise specified. (Continued) PARAMETER DESCRIPTION CONDITIONS MIN TYP 75 PSRR Power Supply Rejection Ratio DC, VS = ±4.75V to ±5.25V 55 -IPSR - Input Current Power Supply Rejection DC, VS = ±4.75V to ±5.25V -2 MAX UNIT dB 2 µA/V ENABLE tEN Enable Time 40 ns tDIS Disable Time 600 ns IIHCE CE Pin Input High Current CE = VS+ 0.8 6 µA IILCE CE Pin Input Low Current CE = VS- 0 -0.1 µA VIHCE CE Input High Voltage for Power-down VILCE CE Input Low Voltage for Power-down NOTE: 1. Standard NTSC test, AC signal amplitude = 286mVP-P, f = 3.58MHz. 3 VS+ -1 V VS+ -3 V EL5393A Typical Performance Curves Non-Inverting Frequency Response (Phase) Non-Inverting Frequency Response (Gain) 90 AV=1 AV=1 0 2 AV=2 AV=2 Phase (°) Normalized Magnitude (dB) 6 -2 AV=5 -6 -90 AV=5 -180 AV=10 AV=10 -270 -10 -14 1M RF=750Ω RL=150Ω 10M 100M -360 1M 1G RF=750Ω RL=150Ω 10M Inverting Frequency Response (Gain) 90 AV=-1 2 AV=-1 AV=-2 0 Phase (°) Normalized Magnitude (dB) 1G Inverting Frequency Response (Phase) 6 -2 AV=-3 -6 -90 AV=-2 AV=-3 -180 -270 -10 RF=500Ω RL=150Ω -14 1M 10M 100M -360 1M 1G RF=500Ω RL=150Ω 10M 100M 1G Frequency (Hz) Frequency (Hz) Frequency Response for Various CIN- Frequency Response for Various RL 6 6 2pF added 1pF added 2 -2 0pF added -6 A =2 V RF=500Ω RL=150Ω -10 1M 10M 100M Frequency (Hz) 4 1G Normalized Magnitude (dB) 10 Normalized Magnitude (dB) 100M Frequency (Hz) Frequency (Hz) 2 RL=100Ω -2 RL=500Ω RL=150Ω -6 -10 -14 1M AV=2 RF=500Ω 10M 100M Frequency (Hz) 1G EL5393A Typical Performance Curves (Continued) Frequency Response for Various CL Frequency Response for Various RF 6 AV=2 RL=150Ω RF=RG=500Ω 10 33pF Normalized Magnitude (dB) Normalized Magnitude (dB) 14 22pF 6 15pF 2 8pF -2 340Ω 620Ω -2 750Ω -6 1.2kΩ -10 0pF -6 1M 10M 100M -14 1M 1G AV=2 RG=RF RL=150Ω 10M Frequency (Hz) Group Delay vs Frequency 1G Frequency Response for Various Common-Mode Input Voltages 6 Normalized Magnitude (dB) 3 AV=2 RF=500Ω 2.5 Delay (ns) 100M Frequency (Hz) 3.5 2 1.5 AV=1 RF=750Ω 1 0.5 0 1M 10M 100M VCM=3V -2 VCM=-3V -6 -10 -14 1M 1G VCM=0V 2 AV=2 RF=500Ω RL=150Ω 10M Frequency (Hz) 100M 1G Frequency (Hz) Transimpedance (ROL) vs Frequency PSRR and CMRR vs Frequency 10M 20 Phase 0 1M PSRR+ 100k -180 10k -270 Gain 1k PSRR/CMRR (dB) 0 -90 Phase (°) Magnitude (Ω) 475Ω 2 -20 PSRR-40 CMRR -60 -360 100 1k 10k 100k 1M 10M Frequency (Hz) 5 100M 1G -80 10k 100k 1M 10M Frequency (Hz) 100M 1G EL5393A Typical Performance Curves (Continued) -3dB Bandwidth vs Supply Voltage for Inverting Gains -3dB Bandwidth vs Supply Voltage for NonInverting Gains 250 400 RF=750Ω RL=150Ω AV=1 -3dB Bandwidth (MHz) -3dB Bandwidth (MHz) 350 300 250 AV=2 200 150 AV=5 100 200 AV=-1 150 AV=-2 100 AV=-5 50 50 RF=500Ω RL=150Ω AV=10 0 5 0 7 6 8 9 5 10 6 Peaking vs Supply Voltage for Non-Inverting Gains 8 9 10 Peaking vs Supply Voltage for Inverting Gains 4 2.5 RF=750Ω RL=150Ω 3.5 RF=500Ω RL=150Ω 2 AV=1 Peaking (dB) 3 Peaking (dB) 7 Total Supply Voltage (V) Total Supply Voltage (V) 2.5 2 1.5 1.5 AV=-1 1 AV=2 1 AV=-2 0.5 0.5 0 5 AV=10 6 7 8 9 0 5 10 Total Supply Voltage (V) -3dB Bandwidth vs Temperature for Non-Inverting Gains 8 9 10 -3dB Bandwidth vs Temperature for Inverting Gains 250 RF=750Ω RL=150Ω 400 -3dB Bandwidth (MHz) -3dB Bandwidth (MHz) 7 Total Supply Voltage (V) 500 AV=1 300 200 AV=2 100 AV=5 0 -40 6 AV=10 10 60 110 Ambient Temperature (°C) 6 160 200 AV=-1 AV=-2 150 100 AV=-5 50 0 -40 RF=500Ω RL=150Ω 10 60 110 Ambient Temperature (°C) 160 EL5393A Typical Performance Curves (Continued) Peaking vs Temperature Voltage and Current Noise vs Frequency 1k 2.5 RL=150Ω Voltage Noise (nV/√Hz) Current Noise (pA/√Hz) 2 Peaking (dB) AV=1 1.5 1 0.5 AV=-1 0 -0.5 -40 60 10 110 100 in + in - 10 en 1 100 160 1k Ambient Temperature (°C) 10 10 8 1 0.1 0.01 0.001 10M 6 4 2 0 100 1k 10k 100k 1M 10M Frequency (Hz) 100M 0 1G 2 4 6 8 Supply Voltage (V) 10 12 Two-Tone 3rd Order Input Referred Intermodulation Intercept (IIP3) 2nd and 3rd Harmonic Distortion vs Frequency -20 25 AV=+2 VOUT=2VP-P RL=100Ω -30 Input Power Intercept (dBm) Harmonic Distortion (dBc) 1M Supply Current vs Supply Voltage 100 Supply Current (mA) Output Impedance (Ω) Closed Loop Output Impedance vs Frequency 10k 100k Frequency (Hz) -40 2nd Order Distortion -50 -60 3rd Order Distortion -70 -80 -90 1 10 Frequency (MHz) 7 100 20 AV=+2 RL=150Ω 15 10 5 0 -5 -10 10 AV=+2 RL=100Ω 100 Frequency (MHz) EL5393A Typical Performance Curves (Continued) Differential Gain/Phase vs DC Input Voltage at 3.58MHz Differential Gain/Phase vs DC Input Voltage at 3.58MHz 0.03 0.04 AV=2 RF=RG=500Ω RL=150Ω dG (%) or dP (°) 0.01 0.02 0 dG -0.01 -0.02 -0.01 -0.02 -0.03 0 0.5 dG 0 -0.04 -0.5 -0.04 -1 1 dP 0.01 -0.03 -0.05 -1 AV=1 RF=750Ω RL=500Ω 0.03 dP dG (%) or dP (°) 0.02 -0.5 DC Input Voltage Output Voltage Swing vs Frequency THD<1% 0.5 1 Output Voltage Swing vs Frequency THD<0.1% 10 10 RL=500Ω Output Voltage Swing (VPP) Output Voltage Swing (VPP) 0 DC Input Voltage 8 RL=150Ω 6 4 2 AV=2 0 1 8 RL=500Ω 6 RL=150Ω 4 2 AV=2 0 10 Frequency (MHz) 100 1 Small Signal Step Response 10 Frequency (MHz) Large Signal Step Response VS=±5V RL=150Ω AV=2 RF=RG=500Ω 200mV/div VS=±5V RL=150Ω AV=2 RF=RG=500Ω 1V/div 10ns/div 8 100 10ns/div EL5393A Typical Performance Curves (Continued) Settling Time vs Settling Accuracy Transimpedance (RoI) vs Temperature 25 625 AV=2 RF=RG=500Ω RL=150Ω VSTEP=5VP-P output 600 15 RoI (kΩ) Settling Time (ns) 20 10 575 550 5 0 0.01 0.1 525 -40 1 10 Settling Accuracy (%) PSRR and CMRR vs Temperature 110 160 110 160 ICMR and IPSR vs Temperature 90 2 80 PSRR ICMR+ 1.5 ICMR/IPSR (µA/V) 70 PSRR/CMRR (dB) 60 Die Temperature (°C) 60 50 CMRR 40 30 1 IPSR 0.5 ICMR- 0 20 10 -40 10 60 110 -0.5 -40 160 10 Die Temperature (°C) 60 Die Temperature (°C) Offset Voltage vs Temperature Input Current vs Temperature 2 60 40 Input Current (µA) VOS (mV) 1 0 -1 20 IB0 -20 IB+ -40 -2 -40 10 60 Die Temperature (°C) 9 110 160 -60 -40 10 60 Temperature (°C) 110 160 EL5393A Typical Performance Curves (Continued) Positive Input Resistance vs Temperature Supply Current vs Temperature 60 5 50 Supply Current (mA) 4 RIN+ (kΩ) 40 30 20 10 0 -40 60 10 110 3 2 1 0 -40 160 10 Temperature (°C) 60 110 160 Temperature (°C) Positive Output Swing vs Temperature for Various Loads Negative Output Swing vs Temperature for Various Loads 4.2 -3.5 4.1 150Ω -3.6 1kΩ -3.7 VOUT (V) VOUT (V) 4 3.9 3.8 3.7 -3.8 -3.9 -4 150Ω 1kΩ 3.6 -4.1 3.5 -40 10 60 110 -4.2 -40 160 10 Temperature (°C) 60 110 160 Temperature (°C) Output Current vs Temperature Slew Rate vs Temperature 130 4000 Slew Rate (V/µS) Sink IOUT (mA) 125 Source 120 115 -40 10 60 Die Temperature (°C) 10 110 160 3500 3000 2500 -40 AV=2 RF=RG=500Ω RL=150Ω 10 60 Die Temperature (°C) 110 160 EL5393A Typical Performance Curves (Continued) Channel-to-Channel Isolation vs Frequency 0 1 Package Power Dissipation vs Ambient Temperature JEDEC JESD51-3 Low Effective Thermal Conductivity Test Board 0.9 Power Dissipation (W) Gain (dB) -20 -40 -60 -80 909mW 0.8 0.7 0.6 633mW 0.5 SO 16 (0 11 .1 0° 50 C/ ”) W QS OP 16 °C /W 15 8 0.4 0.3 0.2 0.1 -100 100k 0 1M 10M 100M 400M 0 Frequency (Hz) 25 50 75 85 100 Ambient Temperature (°C) Package Power Dissipation vs Ambient Temperature - JEDEC JESD51-7 High Effective Thermal Conductivity Test Board Enable Response 1.4 Power Dissipation (W) 1.2 1.250W SO16 (0.150”) 80°C/W 1 0.8 500mV/div 893mW 0.6 QSOP16 112°C/W 0.4 5V/div 0.2 0 0 25 50 75 85 100 125 20ns/div 150 Ambient Temperature (°C) Disable Response 500mV/div 5V/div 400ns/div 11 125 150 EL5393A PIN DESCRIPTIONS 16-PIN SO (0.150") 16-PIN QSOP PIN NAME 1 1 INA+ FUNCTION EQUIVALENT CIRCUIT Non-inverting input, channel A VS+ IN+ IN- VSCircuit 1 2 2 CEA Chip enable, channel A VS+ CE VSCircuit 2 3 3 VS- Negative supply 4 4 CEB Chip enable, channel B (See circuit 2) 5 5 INB+ Non-inverting input, channel B (See circuit 1) 6, 11 6, 11 NC 7 7 CEC Chip enable, channel C (See circuit 2) 8 8 INC+ Non-inverting input, channel C (See circuit 1) 9 9 INC- Inverting input, channel C (See circuit 1) 10 10 OUTC Not connected Output, channel C VS+ OUT VSCircuit 3 12 12 INB- 13 13 OUTB 14 14 VS+ 15 15 OUTA 16 16 INA- Inverting input, channel B (See circuit 1) Output, channel B (See circuit 3) Positive supply Output, channel A (See circuit 3) Inverting input, channel A (See circuit 1) Applications Information Product Description The EL5393A is a current-feedback operational amplifier that offers a wide -3dB bandwidth of 300MHz and a low supply current of 4mA per amplifier. The EL5393A works with supply voltages ranging from a single 5V to 10V and they are also capable of swinging to within 1V of either supply on the output. Because of their current-feedback topology, the EL5393A does not have the normal gainbandwidth product associated with voltage-feedback 12 operational amplifiers. Instead, 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 EL5393A the ideal choice for many low-power/high-bandwidth applications such as portable, handheld, or battery-powered equipment. For varying bandwidth needs, consider the EL5191 with 1GHz on a 9mA supply current or the EL5192 with 600MHz on a 6mA supply current. Versions include single, dual, and triple amp packages with 5-pin SOT23, 16-pin QSOP, and 8-pin or 16-pin SO (0.150") outlines. EL5393A Power Supply Bypassing and Printed Circuit Board Layout As with any high frequency device, good printed circuit board layout is necessary for optimum performance. Low impedance ground plane construction is essential. Surface mount components are recommended, but if leaded components are used, lead 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 4.7µF tantalum capacitor in parallel with a 0.01µF capacitor has been shown to work well when placed at each supply pin. 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) Even when ground plane construction is used, 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 additional series inductance. Use of sockets, particularly for the SO (0.150") package, should be avoided if possible. Sockets add parasitic inductance and capacitance which will result in additional peaking and overshoot. Disable/Power-Down The EL5393A amplifier can be disabled placing its output in a high impedance state. When disabled, the amplifier supply current is reduced to < 450µA. The EL5393A is disabled when its CE pin is pulled up to within 1V of the positive supply. Similarly, the amplifier is enabled by floating or pulling its CE pin to at least 3V below the positive supply. For ±5V supply, this means that an EL5393A amplifier will be enabled when CE is 2V or less, and disabled when CE is above 4V. Although the logic levels are not standard TTL, this choice of logic voltages allows the EL5393A to be enabled by tying CE to ground, even in 5V single supply applications. The CE pin can be driven from CMOS outputs. 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 largevalue feedback and gain resistors exacerbates the problem by further lowering the pole frequency (increasing the possibility of oscillation). The EL5393A has been optimized with a 475Ω feedback resistor. With the high bandwidth of these amplifiers, these resistor values might cause stability problems when combined with parasitic capacitance, thus ground plane is 13 not recommended around the inverting input pin of the amplifier. Feedback Resistor Values The EL5393A has been designed and specified at a gain of +2 with RF approximately 500Ω. This value of feedback resistor gives 200MHz of -3dB bandwidth at AV=2 with 2dB of peaking. With AV=-2, an RF of approximately 500Ω gives 175MHz of bandwidth with 0.2dB of peaking. Since the EL5393A is a current-feedback 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 EL5393A is a current-feedback amplifier, its gain-bandwidth product is not a constant for different closedloop gains. This feature actually allows the EL5393A to maintain about the same -3dB bandwidth. As 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 475Ω and still retain stability, resulting in only a slight loss of bandwidth with increased closed-loop gain. Supply Voltage Range and Single-Supply Operation The EL5393A has been designed to operate with supply voltages having a span of greater than 5V and less than 10V. In practical terms, this means that the EL5393A will operate on dual supplies ranging from ±2.5V to ±5V. With singlesupply, the EL5393A will operate from 5V to 10V. 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 EL5393A has an input range which extends to within 2V of either supply. So, for example, on +5V supplies, the EL5393A has an input range which spans ±3V. The output range of the EL5393A 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 larger because of the increased negative swing due to the external pull-down resistor to ground. 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 150Ω, because of the change in output current with DC level. Previously, 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 4mA supply current of each EL5393A amplifier. Special circuitry EL5393A has been incorporated in the EL5393A to reduce the variation of output impedance with current output. This results in dG and dP specifications of 0.03% and 0.04°, while driving 150Ω at a gain of 2. Video performance has also been measured with a 500Ω load at a gain of +1. Under these conditions, the EL5393A has dG and dP specifications of 0.03% and 0.04°. modified for the EL5393A to remain in the safe operating area. These parameters are calculated as follows: T JMAX = T MAX + ( θ JA × n × PD MAX ) where: TMAX = Maximum ambient temperature Output Drive Capability θJA = Thermal resistance of the package In spite of its low 4mA of supply current, the EL5393A is capable of providing a minimum of ±95mA of output current. With a minimum of ±95mA of output drive, the EL5393A is capable of driving 50Ω loads to both rails, making it an excellent choice for driving isolation transformers in telecommunications applications. n = Number of amplifiers in the package 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 EL5393A 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 5Ω and 50Ω) 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. PDMAX = Maximum power dissipation of each amplifier in the package PDMAX for each amplifier can be calculated as follows: V OUTMAX PD MAX = ( 2 × V S × I SMAX ) + ( V S - V OUTMAX ) × ---------------------------R L where: VS = Supply voltage ISMAX = Maximum supply current of 1A VOUTMAX = Maximum output voltage (required) RL = Load resistance Current Limiting The EL5393A has no internal current-limiting circuitry. If the output is shorted, it is possible to exceed the Absolute Maximum Rating for output current or power dissipation, potentially resulting in the destruction of the device. Power Dissipation With the high output drive capability of the EL5393A, it is possible to exceed the 125°C Absolute Maximum junction temperature under certain very high load current conditions. Generally speaking when RL falls below about 25Ω, 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 All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 14