Quad 600MHz Current Feedback Amplifier with Enable ® Features General Description • 600MHz -3dB bandwidth • 6mA supply current (per amplifier) • Single and dual supply operation, from 5V to 10V • Fast enable/disable (EL5492AC only) • Single (EL5192C), dual (EL5292C), and triple (EL5392C) available • High speed, 1GHz product available (EL5191C) • Low power, 4mA, 300MHz product available (EL5193C, EL5293C, EL5393C, & EL5493C) The EL5492C and EL5492AC are quad current feedback amplifiers with a very high bandwidth of 600MHz. This makes these amplifiers ideal for today’s high speed video and monitor applications. Applications With a supply current of just 6mA 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. The EL5492AC 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. The EL5492C is offered in the industry-standard 14-pin SO (0.150") package and the EL5492AC in the ultra-small 24-pin LPP package. Both operate over the industrial temperature range of -40°C to +85°C. 20 IND- 21 OUTD 22 NC 23 OUTA Pin Configurations Video amplifiers Cable drivers RGB amplifiers Test equipment Instrumentation Current to voltage converters 24 INA- • • • • • • NC 1 19 NC OUTA 1 Ordering Information INA+ 2 18 IND+ CEA 3 17 CED 14 OUTD INA- 2 Package Tape & Reel Outline # 14-Pin SO (0.150") - MDP0027 EL5492CS-T7 14-Pin SO (0.150") 7” MDP0027 EL5492CS-T13 14-Pin SO (0.150") 13” MDP0027 EL5492ACL 24-Pin LPP - MDP0046 EL5492ACL-T7 24-Pin LPP 7” MDP0046 EL5492ACL-T13 24-Pin LPP 13” MDP0046 VS+ 4 Thermal Pad A - D + + 13 IND- INA+ 3 12 IND+ VS+ 4 11 VS- 16 VS- CEB 5 15 CEC INB+ 6 14 INC+ INB+ 5 10 INC+ - INB- 6 + B + C 9 INC- INC- 12 OUTB 7 8 OUTC EL5492CS [14-Pin SO (0.150")] EL5492ACL (24-Pin LPP - Top View) CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-ELANTEC or 408-945-1323 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Elantec ® is a registered trademark of Elantec Semiconductor, Inc. Copyright © Intersil Americas Inc. 2002. All Rights Reserved February 28, 2002 OUTC 11 NC 10 13 NC INB- 8 NC 7 OUTB 9 Part No EL5492CS EL5492C, EL5492AC EL5492C, EL5492AC ® EL5492C, EL5492AC EL5492C, EL5492AC Quad 600MHz Current Feedback Amplifier with Enable Absolute Maximum Ratings (T A = 25°C) Values beyond absolute maximum ratings can cause the device to be prematurely damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. 11V Supply Voltage between VS+ and VSMaximum Continuous Output Current 50mA Operating Junction Temperature Power Dissipation Pin Voltages Storage Temperature Operating Temperature 125°C See Curves VS- - 0.5V to VS+ +0.5V -65°C to +150°C -40°C to +85°C Important Note: All parameters having Min/Max specifications are guaranteed. Typ 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 Characteristics 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 = +1 600 MHz AV = +2 300 MHz 25 MHz 2300 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 9 ns CS Channel Separation f = 5MHz 60 dB 2000 eN Input Voltage Noise 4.1 nV/√Hz iN- IN- Input Current Noise 20 pA/√Hz iN+ IN+ Input Current Noise dG Differential Gain Error dP Differential Phase Error   50 pA/√Hz AV = +2 0.015 % AV = +2 0.04 ° DC Performance VOS Offset Voltage TCVOS Input Offset Voltage Temperature Coefficient ROL Transimpediance -10 Measured from TMIN to TMAX 1 10 mV 5 µV/°C 200 400 kΩ Input Characteristics CMIR Common Mode Input Range ±3 ±3.3 V CMRR Common Mode Rejection Ratio 42 50 dB +IIN + Input Current -60 3 60 µA -IIN - Input Current -35 4 35 µA RIN Input Resistance 37 kΩ CIN Input Capacitance 0.5 pF V Output Characteristics VO RL = 150Ω to GND ±3.4 ±3.7 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 5 ISOFF Supply Current - Disabled No load, VIN = 0V PSRR Power Supply Rejection Ratio DC, VS = ±4.75V to ±5.25V 55 -IPSR - Input Current Power Supply Rejection DC, VS = ±4.75 to ±5.25V -2 IOUT Output Voltage Swing Supply 2 6 7.5 mA 100 150 µA 2 µA/V 75 dB Quad 600MHz Current Feedback Amplifier with Enable Electrical Characteristics 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 Enable (EL5492AC only) 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 VS+ - 1 V VS + - 3 1. Standard NTSC test, AC signal amplitude = 286mVP-P, f = 3.58MHz 2. Measured from the application of CE logic signal until the output voltage is at the 50% point between initial and final values 3 V EL5492C, EL5492AC EL5492C, EL5492AC Quad 600MHz Current Feedback Amplifier with Enable Typical Performance Curves Non-Inverting Frequency Response (Gain) Non-Inverting Frequency Response (Phase) 6 90 AV=2 2 0 -2 -90 AV=1 AV=2 Phase (°) Normalized Magnitude (dB) AV=1 AV=5 -6 AV=5 AV=10 -180 AV=10 -10 -270 RF=750Ω RL=150Ω -14 1M RF=750Ω RL=150Ω 10M 100M -360 1M 1G 10M Frequency (Hz) 1G Inverting Frequency Response (Phase) 6 90 AV=-1 2 AV=-2 AV=-1 0 -2 Phase (°) Normalized Magnitude (dB) 100M Frequency (Hz) Inverting Frequency Response (Gain) AV=-5 -6 -10 -90 AV=-2 AV=-5 -180 -270 RF=375Ω RL=150Ω -14 1M RF=375Ω RL=150Ω 10M 100M -360 1M 1G 10M Frequency (Hz) 6 RL=150Ω 2pF added Normalized Magnitude (dB) 6 1pF added 2 -2 -10 1M 1G Frequency Response for Various RL 10 -6 100M Frequency (Hz) Frequency Response for Various CIN- Normalized Magnitude (dB) EL5492C, EL5492AC EL5492C, EL5492AC 0pF added AV=2 RF=375Ω RL=150Ω RL=100Ω 2 RL=500Ω -2 -6 -10 AV=2 RF=375Ω 10M 100M -14 1M 1G Frequency (Hz) 10M 100M Frequency (Hz) 4 1G Quad 600MHz Current Feedback Amplifier with Enable Typical Performance Curves Frequency Response for Various CL Frequency Response for Various RF 14 6 12pF added 6 Normalized Magnitude (dB) Normalized Magnitude (dB) 250Ω 10 8pF added 2 AV=2 RF=375Ω RL=150Ω -2 -6 1M 0pF added 10M 100M 475Ω -2 620Ω -6 750Ω AV=2 RG=RF RL=150Ω -10 -14 1M 1G 10M Frequency (Hz) 100M 1G Frequency (Hz) Frequency Response for Various Common-Mode Input Voltages Group Delay vs Frequency 3.5 6 VCM=3V 2.5 Normalized Magnitude (dB) 3 Group Delay (ns) 375Ω 2 AV=2 RF=375Ω 2 1.5 1 AV=1 RF=750Ω 0.5 0 1M 100M 10M -2 VCM=-3V -6 -10 -14 1M 1G VCM=0V 2 AV=2 RF=375Ω RL=150Ω 10M 100M 1G Frequency (Hz) Frequency (Hz) Transimpedance (ROL) vs Frequency PSRR and CMRR vs Frequency 10M 20 0 Phase 1M -180 10k PSRR/CMRR (dB) 100k Phase (°) Magnitude (Ω) PSRR+ 0 -90 -270 Gain 1k -20 PSRR-40 -60 CMRR -360 100 1k 10k 100k 1M 10M Frequency (Hz) 100M -80 10k 1G 5 100k 1M 10M Frequency (Hz) 100M 1G EL5492C, EL5492AC EL5492C, EL5492AC Quad 600MHz Current Feedback Amplifier with Enable Typical Performance Curves -3dB Bandwidth vs Supply Voltage for Non-Inverting Gains -3dB Bandwidth vs Supply Voltage for Inverting Gains 800 350 300 600 AV=1 -3dB Bandwidth (MHz) -3dB Bandwidth (MHz) RF=750Ω RL=150Ω 400 AV=2 200 AV=5 AV=10 AV=-1 250 AV=-2 200 AV=-5 150 100 50 0 RF=375Ω RL=150Ω 0 5 6 7 8 10 9 5 6 7 Total Supply Voltage (V) 9 10 Peaking vs Supply Voltage for Inverting Gains 4 4 RF=750Ω RL=150Ω AV=1 RF=375Ω RL=150Ω AV=-1 3 Peaking (dB) 3 Peaking (dB) 8 Total Supply Voltage (V) Peaking vs Supply Voltage for Non-Inverting Gains 2 1 AV=-2 2 1 AV=2 AV=10 AV=-5 0 0 5 6 7 8 9 10 5 6 7 Total Supply Voltage (V) 9 10 -3dB Bandwidth vs Temperature for Inverting Gains 1400 500 RF=750Ω RL=150Ω 1200 400 AV=1 -3dB Bandwidth (MHz) 1000 8 Total Supply Voltage (V) -3dB Bandwidth vs Temperature for Non-Inverting Gains -3dB Bandwidth (MHz) EL5492C, EL5492AC EL5492C, EL5492AC 800 600 400 AV=5 AV=10 AV=2 300 RF=375Ω RL=150Ω AV=-1 AV=-2 200 AV=-5 100 200 0 -40 10 60 110 0 -40 160 Ambient Temperature (°C) 10 60 110 Ambient Temperature (°C) 6 160 Quad 600MHz Current Feedback Amplifier with Enable Typical Performance Curves Peaking vs Temperature Voltage and Current Noise vs Frequency 2 1k RL=150Ω AV=1 Voltage Noise (nV/√Hz) Current Noise (pA/√Hz) Peaking (dB) 1.5 1 AV=-1 0.5 AV=-2 100 in+ in- 10 en 0 AV=2 -0.5 -50 -50 0 50 1 100 100 1k 10k 100k Frequency (Hz) Ambient Temperature (°C) 10 10 8 1 0.1 0.01 6 4 2 0.001 100 0 1k 10k 1M 100k Frequency (Hz) 10M 100M 1G 0 2nd and 3rd Harmonic Distortion vs Frequency 2 4 6 8 Supply Voltage (V) 10 12 Two-Tone 3rd Order Input Referred Intermodulation Intercept (IIP3) -20 30 AV=+2 VOUT=2VP-P RL=100Ω -40 -50 2nd Order Distortion -60 -70 3rd Order Distortion -80 -90 20 15 10 5 0 -5 -10 -100 1 AV=+2 RL=150Ω 25 Input Power Intercept (dBm) -30 Harmonic Distortion (dBc) 10M Supply Current vs Supply Voltage 100 Supply Current (mA) Output Impedance (Ω) Closed Loop Output Impedance vs Frequency 1M 10 Frequency (MHz) AV=+2 RL=100Ω -15 10 100 100 Frequency (MHz) 7 200 EL5492C, EL5492AC EL5492C, EL5492AC Quad 600MHz Current Feedback Amplifier with Enable Typical Performance Curves Differential Gain/Phase vs DC Input Voltage at 3.58MHz Differential Gain/Phase vs DC Input Voltage at 3.58MHz 0.03 0.03 AV=2 RF=RG=375Ω RL=150Ω dG (%) or dP (°) 0.01 0.01 0 dG -0.01 -0.02 0 -0.03 -0.04 -0.05 0 0.5 dG -0.02 -0.04 -0.5 -0.06 -1 1 dP -0.01 -0.03 -0.05 -1 AV=1 RF=750Ω RL=500Ω 0.02 dP dG (%) or dP (°) 0.02 -0.5 DC Input Voltage 0 0.5 1 DC Input Voltage Output Voltage Swing vs Frequency THD<0.1% Output Voltage Swing vs Frequency THD<1% 9 10 RL=500Ω 7 RL=500Ω Output Voltage Swing (VPP) 8 Output Voltage Swing (VPP) EL5492C, EL5492AC EL5492C, EL5492AC RL=150Ω 6 5 4 3 2 1 8 RL=150Ω 6 4 2 AV=2 AV=2 0 0 1 10 Frequency (MHz) 1 100 Small Signal Step Response 10 Frequency (MHz) 100 Large Signal Step Response VS=±5V RL=150Ω AV=2 RF=RG=375Ω VS=±5V RL=150Ω AV=2 RF=RG=375Ω 200mV/div 1V/div 10ns/div 10ns/div 8 Quad 600MHz Current Feedback Amplifier with Enable Typical Performance Curves Settling Time vs Settling Accuracy Transimpedance (RoI) vs Temperature 25 500 AV=2 RF=RG=375Ω RL=150Ω VSTEP=5VP-P output 450 15 RoI (kΩ) Settling Time (ns) 20 10 400 350 5 0 0.01 0.1 300 -40 1 10 PSRR and CMRR vs Temperature 110 160 110 160 ICMR and IPSR vs Temperature 90 2.5 80 PSRR 2 ICMR/IPSR (µA/V) 70 PSRR/CMRR (dB) 60 Die Temperature (°C) Settling Accuracy (%) 60 CMRR 50 40 30 ICMR+ 1.5 1 IPSR 0.5 0 ICMR-0.5 20 10 -40 10 60 110 -1 -40 160 10 Die Temperature (°C) 60 Die Temperature (°C) Offset Voltage vs Temperature Input Current vs Temperature 60 3 40 Input Current (µA) VOS (mV) 2 1 0 20 IB0 -20 IB+ -40 -1 -60 -2 -40 10 60 110 -80 -40 160 10 60 Temperature (°C) Die Temperature (°C) 9 110 160 EL5492C, EL5492AC EL5492C, EL5492AC Quad 600MHz Current Feedback Amplifier with Enable Typical Performance Curves Positive Input Resistance vs Temperature Supply Current vs Temperature 50 8 45 7 40 6 Supply Current (mA) RIN+ (kΩ) 35 30 25 20 15 10 5 4 3 2 1 5 0 -40 10 60 110 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 4 -3.7 3.9 -3.8 VOUT (V) VOUT (V) 1kΩ 3.8 3.7 -3.9 1kΩ -4 150Ω 3.6 -4.1 3.5 -40 10 50 110 -4.2 -40 160 10 Temperature (°C) 60 160 Slew Rate vs Temperature 135 4600 AV=2 RF=RG=375Ω RL=150Ω 4400 4200 Sink Slew Rate (V/µS) 130 110 Temperature (°C) Output Current vs Temperature IOUT (mA) EL5492C, EL5492AC EL5492C, EL5492AC 125 Source 120 4000 3800 3600 3400 3200 115 -40 10 60 110 3000 -40 160 Die Temperature (°C) 10 60 Die Temperature (°C) 10 110 160 Quad 600MHz Current Feedback Amplifier with Enable Typical Performance Curves Channel-to-Channel Isolation vs Frequency Enable Response 0 Gain (dB) -20 500mV/div -40 -60 5V/div -80 -100 100k 1M 10M 100M 400M 20ns/div Frequency (Hz) Package Power Dissipation vs Ambient Temperature JEDEC JESD51-3 Low Effective Thermal Conductivity (Single Layer) Test Board Disable Response 1 833mW Power Dissipation (W) 0.8 500mV/div 714mW 0.6 SO14 (0.150”) 120°C/W LPP24 140°C/W 0.4 0.2 5V/div 0 0 400ns/div 25 50 75 85 100 Ambient Temperature (°C) Package Power Dissipation vs Ambient Temperature JEDEC JESD51-7 High Effective Thermal Conductivity (4 layer) Test Board - LPP exposed diepad soldered to PCB per JESD51-5 3 LP 2 37 4 P2 / °C W Power Dissipation (W) 2.5 2.703W 1.5 1.136W SO1 4 (0 .150 ”) 88° C /W 1 0.5 0 0 25 50 75 85 100 125 150 Ambient Temperature (°C) 11 125 150 EL5492C, EL5492AC EL5492C, EL5492AC EL5492C, EL5492AC EL5492C, EL5492AC Quad 600MHz Current Feedback Amplifier with Enable Pin Descriptions EL5492CS 14-Pin SO (0.150") EL5492ACL 24-Pin LPP Pin Name 1 23 OUTA Function Equivalent Circuit Output, channel A VS+ OUT VSCircuit 1 2 24 INA- Inverting input, channel A VS+ IN+ IN- VSCircuit 2 3 2 INA+ Non-inverting input, channel A 3 CEA Chip enable, channel A (see circuit 2) VS+ CE VSCircuit 3 4 4 VS+ Positive supply 5 5 CEB Chip enable, channel B 6 INB+ Non-inverting input, channel B 6 (see circuit 2) 8 INB- Inverting input, channel B (see circuit 2) 7 9 OUTB Output, channel B (see circuit 1) 8 11 OUTC Output, channel C (see circuit 1) 9 12 INC- Inverting input, channel C (see circuit 2) 10 14 INC+ Non-inverting input, channel C (see circuit 2) 15 CEC Chip enable, channel C (see circuit 3) 11 16 VS- Negative supply (see circuit 3) 17 CED Chip enable, channel D 12 18 IND+ Non-inverting input, channel D (see circuit 2) 13 20 IND- Inverting input, channel D (see circuit 1) 21 OUTD Output, channel D (see circuit 1) 1, 7, 10, 13, 19, 22 NC 14 (see circuit 3) No connection 12 Quad 600MHz Current Feedback Amplifier with Enable Applications Information Product Description 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. The EL5492C is a current-feedback operational amplifier that offers a wide -3dB bandwidth of 600MHz and a low supply current of 6mA per amplifier. The EL5492C 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 currentfeedback topology, the EL5492C does not have the normal gain-bandwidth product associated with voltagefeedback 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 EL5492C the ideal choice for many low-power/highbandwidth applications such as portable, handheld, or battery-powered equipment. Disable/Power-Down The EL5492AC amplifier can be disabled placing its output in a high impedance state. When disabled, the amplifier supply current is reduced to < 600µ A. The EL5492AC 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 EL5492AC 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 EL5492AC to be enabled by tying CE to ground, even in 5V single supply applications. The CE pin can be driven from CMOS outputs. For varying bandwidth needs, consider the EL5191C with 1GHz on a 9mA supply current or the EL5193C with 300MHz on a 4mA 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. Capacitance at the Inverting Input Any manufacturer’s high-speed voltage- or currentfeedback 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 openloop response. The use of large-value feedback and gain resistors exacerbates the problem by further lowering the pole frequency (increasing the possibility of oscillation.) 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 The EL5492C has been optimized with a 375Ω 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 not recommended around the inverting input pin of the amplifier. 13 EL5492C, EL5492AC EL5492C, EL5492AC EL5492C, EL5492AC EL5492C, EL5492AC Quad 600MHz Current Feedback Amplifier with Enable Feedback Resistor Values Video Performance The EL5492C has been designed and specified at a gain of +2 with RF approximately 375Ω. This value of feedback resistor gives 300MHz of -3dB bandwidth at AV=2 with 2dB of peaking. With AV=-2, an RF of 375Ω gives 275MHz of bandwidth with 1dB of peaking. Since the EL5492C 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. 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 6mA supply current of each EL5492C amplifier. Special circuitry has been incorporated in the EL5492C to reduce the variation of output impedance with current output. This results in dG and dP specifications of 0.015% and 0.04°, while driving 150Ω at a gain of 2. Because the EL5492C is a current-feedback amplifier, its gain-bandwidth product is not a constant for different closed-loop gains. This feature actually allows the EL5492C 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 375Ω and still retain stability, resulting in only a slight loss of bandwidth with increased closed-loop gain. Video performance has also been measured with a 500Ω load at a gain of +1. Under these conditions, the EL5492C has dG and dP specifications of 0.03% and 0.05°, respectively. Output Drive Capability Supply Voltage Range and Single-Supply Operation In spite of its low 6mA of supply current, the EL5492C is capable of providing a minimum of ±95mA of output current. With a minimum of ±95mA of output drive, the EL5492C is capable of driving 50Ω loads to both rails, making it an excellent choice for driving isolation transformers in telecommunications applications. The EL5492C 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 EL5492C will operate on dual supplies ranging from ±2.5V to ±5V. With single-supply, the EL5492C will operate from 5V to 10V. 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 EL5492C 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. 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 EL5492C has an input range which extends to within 2V of either supply. So, for example, on ±5V supplies, the EL5492C has an input range which spans ±3V. The output range of the EL5492C 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. 14 Quad 600MHz Current Feedback Amplifier with Enable where: Current Limiting TMAX = Maximum ambient temperature The EL5492C 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. θJA = Thermal resistance of the package n = Number of amplifiers in the package PDMAX = Maximum power dissipation of each amplifier in the package Power Dissipation PDMAX for each amplifier can be calculated as follows: With the high output drive capability of the EL5492C, 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 (T JMAX) for the application to determine if power supply voltages, load conditions, or package type need to be modified for the EL5492C to remain in the safe operating area. These parameters are calculated as follows: V O U TMA X PDMA X = ( 2 × V S × I S MA X ) + ( V S - V OU TMA X ) × -------------------------RL where: VS = Supply voltage ISMAX = Maximum supply current of 1A VOUTMAX = Maximum output voltage (required) RL = Load resistance T JM A X = T M AX + ( θ JA × n × PD M AX ) 15 EL5492C, EL5492AC EL5492C, EL5492AC EL5492C, EL5492AC EL5492C, EL5492AC Quad 600MHz Current Feedback Amplifier with Enable Effective May 15, 2002, Elantec, a leader in high performance analog products, is now a part of Intersil Corporation. 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. February 28, 2002 For information regarding Intersil Corporation and its products, see www.intersil.com ® Sales Office Headquarters NORTH AMERICA Intersil Corporation 7585 Irvine Center Drive Suite 100 Irvine, CA 92618 TEL: 949-341-7000 FAX: 949-341-7123 Elantec 675 Trade Zone Blvd. Milpitas, CA 95035 TEL: 408-945-1323 800: 888-ELANTEC FAX: 408-945-9305 EUROPE Intersil Europe Sarl Avenue William Fraisse 3 1006 Lausanne Switzerland TEL: +41-21-6140560 FAX: +41-21-6140579 16 ASIA Intersil Corporation Unit 1804 18/F Guangdong Water Bldg. 83 Austin Road TST, Kowloon Hong Kong TEL: +852-2723-6339 FAX: +852-2730-1433 Printed in U.S.A.