600MHz Current Feedback Amplifier with Enable ® Features General Description • 600MHz -3dB bandwidth • 6mA supply current • Single and dual supply operation, from 5V to 10V supply span • Fast enable/disable (EL5192AC only) • Available in SOT-23 packages • Dual (EL5292C) and triple (EL5392C) available • High speed, 1GHz product available (EL5191C) • Low power, 4mA, 300MHz product available (EL5193C, EL5293C, and EL5393C) The EL5192C and EL5192AC are current feedback amplifiers with a very high bandwidth of 600MHz. This makes these amplifiers ideal for today’s high speed video and monitor applications. EL5192C, EL5192AC EL5192C, EL5192AC ® With a supply current of just 6mA and the ability to run from a single supply voltage from 5V to 10V, the amplifiers are also ideal for hand held, portable or battery-powered equipment. The EL5192AC 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 EL5192C is offered in the 5-pin SOT-23 package and the EL5192AC is available in the 6-pin SOT-23 as well as the industrystandard 8-pin SO packages. Both operate over the industrial temperature range of -40°C to +85°C. Applications • • • • • • Pin Configurations Video amplifiers Cable drivers RGB amplifiers Test equipment Instrumentation Current to voltage converters NC 1 IN- 2 IN+ 3 Ordering Information Part No Package 8 CE + VS- 4 Tape & Reel Outline # EL5192CW-T7 5-Pin SOT-23* 7” MDP0038 EL5192CW-T13 5-Pin SOT-23* 13” MDP0038 EL5192ACW-T7 6-Pin SOT-23* 7” MDP0038 EL5192ACW-T13 6-Pin SOT-23* 13” MDP0038 EL5192ACS 8-Pin SO - MDP0027 EL5192ACS-T7 8-Pin SO 7” MDP0027 EL5192ACS-T13 8-Pin SO 13” MDP0027 6 OUT 5 NC EL5192ACS (8-Pin SO) OUT 1 VS- 2 *EL5192CW & EL5192ACW symbol is .Oxxx where xxx represents date code 7 VS+ + OUT 1 5 CE VS- 2 4 IN- IN+ 3 - IN+ 3 EL5192ACW (6-Pin SOT-23) 5 VS+ + 4 IN- EL5192CW (5-Pin SOT-23) 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 November 15, 2002 6 VS+ EL5192C, EL5192AC EL5192C, EL5192AC 600MHz Current Feedback Amplifier with Enable Absolute Maximum Ratings (T A = 25°C) Values beyond absolute maximum ratings can cause the device to be permanently 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 2800 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 eN 2400 9 ns Input Voltage Noise 4.1 nV/√Hz iN- IN- Input Current Noise 20 pA/√Hz iN+ IN+ Input Current Noise 50 pA/√Hz dG Differential Gain Error AV = +2 0.015 % dP Differential Phase Error AV = +2 0.04 ° [1] [1] 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 200 400 kΩ Input Characteristics CMIR Common Mode Input Range ±3 ±3.3 V CMRR Common Mode Rejection Ratio 42 50 dB -ICMR - Input Current Common Mode Rejection -6 6 µA/V +IIN + Input Current -60 3 60 µA -IIN - Input Current -35 2 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 IOUT Output Voltage Swing Supply 2 6 7.5 mA 100 150 µA 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. Min Typ PSRR Parameter Power Supply Rejection Ratio Description DC, VS = ±4.75V to ±5.25V Conditions 55 75 -IPSR - Input Current Power Supply Rejection DC, VS = ±4.75V to ±5.25V -2 Max Unit 2 µA/V dB Enable (EL5192AC 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 + - 3 V VS+ - 1 1. Standard NTSC test, AC signal amplitude = 286mVP-P, f = 3.58MHz 3 V EL5192C, EL5192AC EL5192C, EL5192AC 600MHz Current Feedback Amplifier with Enable Typical Performance Curves Non-Inverting Frequency Response (Gain) SOT-23 Package 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) EL5192C, EL5192AC EL5192C, EL5192AC 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 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 -2 -6 1M 0pF added AV=2 RF=375Ω RL=150Ω 10M 100M 475Ω -2 620Ω -6 750Ω -10 -14 1M 1G AV=2 RG=RF RL=150Ω 10M Frequency (Hz) 100M 1G Frequency (Hz) Frequency Response for Various Common-Mode Input Voltages Group Delay vs Frequency 3.5 6 VCM=3V Normalized Magnitude (dB) 3 2.5 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 0 -180 10k Gain PSRR/CMRR (dB) 100k Phase (°) Magnitude (Ω) -90 -270 1k PSRR+ -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 EL5192C, EL5192AC EL5192C, EL5192AC 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 Total Supply Voltage (V) 8 9 10 Peaking vs Supply Voltage for Inverting Gains 4 4 RF=750Ω RL=150Ω AV=1 3 2 1 RF=375Ω RL=150Ω AV=-1 Peaking (dB) 3 Peaking (dB) 7 Total Supply Voltage (V) Peaking vs Supply Voltage for Non-Inverting Gains AV=-2 2 1 AV=2 AV=10 AV=-5 0 0 5 6 7 8 9 10 5 6 Total Supply Voltage (V) 7 8 9 10 Total Supply Voltage (V) Non-inverting Frequency Response (Gain) SO8 Package Non-inverting Frequency Response (Phase) SO8 Package 6 90 2 AV=1 0 AV=1 -2 Phase (°) Normalized Magnitude (dB) EL5192C, EL5192AC EL5192C, EL5192AC AV=2 -6 AV=2 -90 AV=5 -180 AV=10 AV=5 -10 -270 AV=10 RF=750Ω RL=150Ω -14 1M RF=750Ω RL=150Ω 10M 100M -360 1M 1G 1.6G Frequency (Hz) 10M 100M Frequency (Hz) 6 1G 600MHz Current Feedback Amplifier with Enable Typical Performance Curves Inverting Frequency Response (Phase) SO8 Package Inverting Frequency Response (Gain) SO8 Package 6 90 AV=-2 2 0 -2 Phase (°) Normalized Magnitude (dB) AV=-1 AV=-5 -6 -10 AV=-1 -90 AV=-2 -180 AV=-5 -270 RF=375Ω RL=150Ω RF=375Ω RL=150Ω -14 1M 10M 100M -360 1M 1G 10M 1G -3dB Bandwidth vs Temperature for Inverting Gains -3dB Bandwidth vs Temperature for Non-Inverting Gains 500 1400 1200 RF=750Ω RL=150Ω AV=1 800 600 400 AV=5 AV=10 AV=2 RF=375Ω RL=150Ω AV=-1 400 1000 -3dB Bandwidth (MHz) -3dB Bandwidth (MHz) 100M Frequency (Hz) Frequency (Hz) 300 AV=-2 200 AV=-5 100 200 0 -40 10 60 110 0 -40 160 10 60 110 160 Ambient Temperature (°C) Ambient Temperature (°C) 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 Ambient Temperature (°C) 7 1k 10k 100k Frequency (Hz) 1M 10M EL5192C, EL5192AC EL5192C, EL5192AC 600MHz Current Feedback Amplifier with Enable Typical Performance Curves Supply Current vs Supply Voltage 100 10 10 8 Supply Current (mA) Output Impedance (Ω) Closed Loop Output Impedance vs Frequency 1 0.1 0.01 6 4 2 0.001 100 0 1k 10k 100k 1M Frequency (Hz) 10M 100M 1G 0 -20 4 6 8 Supply Voltage (V) 10 12 30 AV=+2 VOUT=2VP-P RL=100Ω -40 2nd Order Distortion -50 AV=+2 RL=150Ω 25 Input Power Intercept (dBm) -30 Harmonic Distortion (dBc) 2 Two-Tone 3rd Order Input Referred Intermodulation Intercept (IIP3) 2nd and 3rd Harmonic Distortion vs Frequency -60 -70 3rd Order Distortion -80 -90 20 15 10 5 0 -5 AV=+2 RL=100Ω -10 -100 1 10 Frequency (MHz) -15 10 100 0.03 AV=2 RF=RG=375Ω RL=150Ω 0.02 dP 0.01 dG (%) or dP (°) 0.01 0 dG -0.01 -0.02 -0.03 -0.05 0.5 -0.06 -1 1 DC Input Voltage dG -0.02 -0.04 0 dP 0 -0.04 -0.5 AV=1 RF=750Ω RL=500Ω -0.01 -0.03 -0.05 -1 200 Differential Gain/Phase vs DC Input Voltage at 3.58MHz 0.03 0.02 100 Frequency (MHz) Differential Gain/Phase vs DC Input Voltage at 3.58MHz dG (%) or dP (°) EL5192C, EL5192AC EL5192C, EL5192AC -0.5 0 DC Input Voltage 8 0.5 1 600MHz Current Feedback Amplifier with Enable Typical Performance Curves Output Voltage Swing vs Frequency THD<1% Output Voltage Swing vs Frequency THD<0.1% 9 10 RL=500Ω 7 RL=150Ω 6 5 4 3 2 1 8 Output Voltage Swing (VPP) Output Voltage Swing (VPP) 8 RL=150Ω RL=500Ω 6 4 2 AV=2 AV=2 0 0 1 10 Frequency (MHz) 100 1 Small Signal Step Response 10 Frequency (MHz) 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 Settling Time vs Settling Accuracy Transimpedance (RoI) vs Temperature 25 500 AV=2 RF=RG=375Ω RL=150Ω VSTEP=5VP-P output 20 450 15 RoI (kΩ) Settling Time (ns) 100 10 350 5 0 0.01 400 0.1 300 -40 1 Settling Accuracy (%) 10 60 Die Temperature (°C) 9 110 160 EL5192C, EL5192AC EL5192C, EL5192AC 600MHz Current Feedback Amplifier with Enable Typical Performance Curves PSRR and CMRR vs Temperature ICMR and IPSR vs Temperature 90 2.5 80 PSRR 2 ICMR/IPSR (µA/V) PSRR/CMRR (dB) 70 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) 60 110 160 Die Temperature (°C) Offset Voltage vs Temperature Input Current vs Temperature 3 60 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 Die Temperature (°C) 110 160 110 160 Supply Current vs Temperature 50 8 45 7 40 6 Supply Current (mA) 35 30 25 20 15 10 5 4 3 2 1 5 0 -40 60 Temperature (°C) Positive Input Resistance vs Temperature RIN+ (kΩ) EL5192C, EL5192AC EL5192C, EL5192AC 10 60 110 0 -40 160 Temperature (°C) 10 60 Temperature (°C) 10 600MHz Current Feedback Amplifier with Enable Typical Performance Curves 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 60 10 Temperature (°C) Output Current vs Temperature 160 Slew Rate vs Temperature 135 4600 AV=2 RF=RG=375Ω RL=150Ω 4400 130 4200 Sink Slew Rate (V/µS) IOUT (mA) 110 Temperature (°C) 125 Source 120 4000 3800 3600 3400 3200 115 -40 10 60 110 3000 -40 160 10 Die Temperature (°C) 60 Die Temperature (°C) Enable Response Disable Response 500mV/div 500mV/div 5V/div 5V/div 20ns/div 400ns/div 11 110 160 EL5192C, EL5192AC EL5192C, EL5192AC 600MHz Current Feedback Amplifier with Enable Typical Performance Curves Package Power Dissipation vs Ambient Temperature JEDEC JESD51-3 Low Effective Thermal Conductivity Test Board 0.7 0.6 625mW 0 16 0.5 8 SO /W °C Power Dissipation (W) EL5192C, EL5192AC EL5192C, EL5192AC 0.4 391mW SO T-2 3 25 6 °C /W 0.3 0.2 0.1 0 0 25 50 75 85 100 125 150 Ambient Temperature (°C) 12 600MHz Current Feedback Amplifier with Enable Pin Descriptions EL5192AC 8-Pin SO EL5192C EL5192AC 5-Pin SOT-23 6-Pin SOT-23 1, 5 2 4 4 Pin Name Function NC Not connected IN- Inverting input Equivalent Circuit VS+ IN+ IN- VSCircuit 1 3 3 3 IN+ Non-inverting input 4 2 2 VS - Negative supply 6 1 1 OUT Output (See circuit 1) VS+ OUT VSCircuit 2 7 8 5 6 VS + Positive supply 5 CE Chip enable VS+ CE VSCircuit 3 13 EL5192C, EL5192AC EL5192C, EL5192AC EL5192C, EL5192AC EL5192C, EL5192AC 600MHz Current Feedback Amplifier with Enable Applications Information Product Description particularly for the SO package, should be avoided if possible. Sockets add parasitic inductance and capacitance which will result in additional peaking and overshoot. The EL5192C is a current-feedback operational amplifier that offers a wide -3dB bandwidth of 600MHz and a low supply current of 6mA per amplifier. The EL5192C 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 EL5192C 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 EL5192C the ideal choice for many low-power/highbandwidth applications such as portable, handheld, or battery-powered equipment. Disable/Power-Down The EL5192AC amplifier can be disabled placing its output in a high impedance state. When disabled, the amplifier supply current is reduced to < 150µ A. The EL5192AC 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 EL5192AC 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 EL5192AC 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 SOT-23, 16-pin QSOP, and 8-pin or 16-pin SO 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. The EL5192C 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. 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, 14 600MHz Current Feedback Amplifier with Enable Feedback Resistor Values Video Performance The EL5192C 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 EL5192C 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 EL5192C amplifier. Special circuitry has been incorporated in the EL5192C 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 EL5192C is a current-feedback amplifier, its gain-bandwidth product is not a constant for different closed-loop gains. This feature actually allows the EL5192C 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 EL5192C 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 EL5192C is capable of providing a minimum of ±95mA of output current. With a minimum of ±95mA of output drive, the EL5192C is capable of driving 50Ω loads to both rails, making it an excellent choice for driving isolation transformers in telecommunications applications. The EL5192C 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 EL5192C will operate on dual supplies ranging from ±2.5V to ±5V. With single-supply, the EL5192C 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 EL5192C 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 EL5192C has an input range which extends to within 2V of either supply. So, for example, on ±5V supplies, the EL5192C has an input range which spans ±3V. The output range of the EL5192C 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. 15 EL5192C, EL5192AC EL5192C, EL5192AC EL5192C, EL5192AC EL5192C, EL5192AC 600MHz Current Feedback Amplifier with Enable Current Limiting The EL5192C 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 EL5192C, 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 EL5192C to remain in the safe operating area. These parameters are calculated as follows: T JM A X = T M AX + ( θ JA × n × PD M AX ) where: TMAX = Maximum ambient temperature θJA = 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: V O U TMA X PDMA X = ( 2 × V S × I S MA X ) + ( V S - V OU TMA X ) × -------------------------R L where: VS = Supply voltage ISMAX = Maximum supply current of 1A VOUTMAX = Maximum output voltage (required) RL = Load resistance 16 600MHz Current Feedback Amplifier with Enable Typical Application Circuits Inverting 200mA Output Current Distribution Amplifier 0.1µF +5V IN+ VS+ OUT INVS0.1µF -5V 375Ω 5Ω 0.1µF VOUT +5V IN+ VS+ 5Ω OUT INVS0.1µF -5V 375Ω 375Ω VIN Fast-Settling Precision Amplifier 375Ω 375Ω 0.1µF +5V IN+ VS+ OUT INVS0.1µF 375Ω -5V 375Ω +5V 0.1µF VIN IN+ VS+ OUT INVS0.1µF -5V 17 VOUT EL5192C, EL5192AC EL5192C, EL5192AC EL5192C, EL5192AC EL5192C, EL5192AC 600MHz Current Feedback Amplifier with Enable Typical Application Circuits Differential Line Driver/Receiver 0.1µF 0.1µF +5V IN+ +5V IN+ VS+ VS+ OUT OUT IN- INVS- VS0.1µF 0.1µF -5V -5V 375Ω 0.1µF 162Ω 375Ω 375Ω VOUT+ 0.1µF 1kΩ +5V IN+ 240Ω 0.1µF +5V VS+ OUT IN- 0.1µF 162Ω IN+ VOUT- VS- VS+ OUT 1kΩ IN- 0.1µF VS- -5V 375Ω 0.1µF -5V 375Ω VIN 375Ω Transmitter 375Ω Receiver 18 VOUT EL5192C, EL5192AC EL5192C, EL5192AC 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. November 15, 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 19 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.