Triple 200MHz Fixed Gain Amplifier Features General Description • Gain selectable (+1, -1, +2) • 200MHz -3dB bandwidth (AV = 1, 2) • 4mA supply current (per amplifier) • Single and dual supply operation, from 5V to 10V • Available in 16-pin QSOP package • Single (EL5197C) available • 400MHz, 9mA product available (EL5196C, EL5396C) The EL5397C is a triple channel, fixed gain amplifier with a bandwidth of 200MHz, making these amplifiers ideal for today’s high speed video and monitor applications. The EL5397C features integnal gain setting resistors and can be configured in a gain of +1, -1 or +2. The same bandwidth is seen in both gain-of-1 and gain-of-2 applications. Applications • • • • • • • • Battery-powered Equipment Hand-held, Portable Devices Video Amplifiers Cable Drivers RGB Amplifiers Test Equipment Instrumentation Current to Voltage Converters 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. For applications where board space is critical, the EL5397C is offered in the 16-pin QSOP package, as well as a 16-pin SO. The EL5397C is specified for operation over the full industrial temperature range of ---40°C to +85°C. Pin Configurations Ordering Information 16-Pin SO & QSOP Package Tape & Reel EL5397CS 16-Pin SO - MDP0027 EL5397CS-T7 16-Pin SO 7” MDP0027 EL5397CS-T13 16-Pin SO 13” MDP0027 Part No Outline # EL5397CU 16-Pin QSOP - MDP0040 EL5397CU-T13 16-Pin QSOP 13” MDP0040 INA+ 1 NC* 2 16 INA+ VS- 3 NC* 4 + - 13 OUTB 12 INB- NC 6 11 NC + - INC+ 8 10 OUTC 9 INC- EL5397CS, EL5397CU * This pin must be left disconnected Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation. September 19, 2001 NC* 7 15 OUTA 14 VS+ INB+ 5 © 2001 Elantec Semiconductor, Inc. EL5397C - Preliminary EL5397C - Preliminary EL5397C - Preliminary EL5397C - Preliminary Triple 200MHz Fixed Gain Amplifier 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. Supply Voltage between VS+ and VS11V Maximum Continuous Output Current 50mA Operating Junction Temperature 125°C Power Dissipation Pin Voltages Storage Temperature Operating Temperature Lead Temperature See Curves VS- - 0.5V to VS+ +0.5V -65°C to +150°C -40°C to +85°C 260°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, RL = 150Ω, TA = 25°C unless otherwise specified. Parameter Description Conditions Min Typ Max Unit AC Performance BW -3dB Bandwidth AV = +1 200 AV = +2 200 MHz MHz 20 MHz 2100 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 67 dB en Input Voltage Noise 4.8 nV/√Hz in- IN- input current noise 17 pA/√Hz in+ IN+ input current noise 50 pA/√Hz dG Differential Gain Error AV = +2 0.03 % dP Differential Phase Error AV = +2 0.04 °   1900 DC Performance VOS Offset Voltage TCVOS Input Offset Voltage Temperature Coefficient Measured from TMIN to TMAX -10 AE Gain Error VO = -3V to +3V RF, RG Internal RF and RG 1 10 5 -2 320 400 mV µV/°C 2 % 480 Ω Input Characteristics CMIR Common Mode Input Range ±3V ±3.3V +IIN + Input Current -60 1 60 µA V -IIN - Input Current -30 1 30 µA RIN Input Resistance 45 kΩ CIN Input Capacitance 0.5 pF V Output Characteristics VO IOUT Output Voltage Swing RL = 150Ω to GND ±3.4V ±3.7V RL = 1KΩ to GND ±3.8V ±4.0V V Output Current RL = 10Ω to GND 95 120 mA Supply IsON Supply Current No Load, VIN = 0V 3 4 PSRR Power Supply Rejection Ratio DC, VS = ±4.75V to ±5.25V 55 75 -IPSR - Input Current Power Supply Rejection DC, VS = ±4.75V to ±5.25V -2 1. Standard NTSC test, AC signal amplitude = 286mVp-p, f = 3.58MHz 2 5 mA 2 µA/V dB Triple 200MHz Fixed Gain Amplifier Typical Performance Curves Frequency Response (Gain) Frequency Response (Phase), All Gains 90 6 AV=2 0 2 -2 AV=1 Phase (°) -6 -90 -180 -270 -10 RL=150Ω -14 1M RL=150Ω 10M 100M -360 1M 1G 10M Frequency Response for Various CL 3.5 AV=2 RL=150Ω 10 AV=2 3 2.5 22pF added 6 Delay (ns) Normalized Magnitude (dB) 1G Group Delay vs Frequency 14 10pF added 2 2 1.5 AV=1 1 0pF added -2 -6 1M 10M 0.5 100M RL=150Ω 0 1M 1G 10M 6 Frequency Response for Various Common-mode Input Voltages 3V 100M 1G Frequency (Hz) Frequency (Hz) Transimpedance (ROL) vs Frequency 10M -3V 0 Phase 2 1M 0V -90 Magnitude (Ω) Normalized Magnitude (dB) 100M Frequency (Hz) Frequency (Hz) -2 -6 100k -180 10k -270 Gain -10 -14 1M 1k AV=2 RL=150Ω -360 10M 100M 100 1k 1G Frequency (Hz) 3 10k 100k 1M 10M Frequency (Hz) 100 1G Phase (°) Normalized Magnitude (dB) AV=-1 EL5397C - Preliminary EL5397C - Preliminary Triple 200MHz Fixed Gain Amplifier Typical Performance Curves PSRR and CMRR vs Frequency -3dB Bandwidth vs Supply Voltage 250 20 RL=150Ω PSRR/CMRR (dB) -20 -3dB Bandwidth (MHz) PSRR+ 0 PSRR- -40 CMRR 200 AV=2 150 AV=-1 AV=1 -60 -80 10k 100k 1M 10M 100M 100 1G 5 6 10 -3dB Bandwidth vs Temperature 5 300 4 250 -3dB Bandwidth (MHz) AV=-1 AV=1 Peaking (dB) 9 Total Supply Voltage (V) Peaking vs Supply Voltage 3 AV=2 2 1 5 200 150 100 50 RL=150Ω 0 8 7 Frequency (Hz) 6 7 8 9 RL=150Ω 0 -40 10 10 Total Supply Voltage (V) 60 110 160 Ambient Temperature (°C) Peaking vs Temperature Voltage and Current Noise vs Frequency 1 1000 Voltage Noise (nV/√Hz) , Current Noise (pA/√Hz) 0.8 Peaking (dB) EL5397C - Preliminary EL5397C - Preliminary 0.6 0.4 0.2 100 in+ in- 10 en RL=150Ω 0 -40 10 60 110 1 100 160 Ambient Temperature (°C) 4 1000 10k 100k Frequency (Hz) 1M 10M Triple 200MHz Fixed Gain Amplifier 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 6 4 2 0.01 0.001 100 0 1k 10k 100k 1M 10M 100M 1G 0 2 4 Frequency (Hz) 2nd and 3rd Harmonic Distortion vs Frequency -20 25 AV=+2 VOUT=2VP-P RL=100Ω -40 2nd Order Distortion -50 -60 3rd Order Distortion -70 -80 1 10 5 0 AV=+2 RL=100Ω 0.01 AV=2 RF=RG=500Ω RL=150Ω 0.04 dP 0.03 dG -0.01 -0.02 -0.03 0.5 -0.04 -1 1 DC Input Voltage dG -0.01 -0.02 0 dP 0 -0.04 -0.5 AV=1 RF=750Ω RL=500Ω 0.01 -0.03 -0.05 -1 Differential Gain/Phase vs DC Input Voltage at 3.58MHz 0.02 0 100 Frequency (MHz) Differential Gain/Phase vs DC Input Voltage at 3.58MHz 0.02 dG (%) or dP (°) 15 -10 10 100 dG (%) or dP (°) 0.03 10 Frequency (MHz) 12 AV=+2 RL=150Ω -5 -90 10 Two-tone 3rd Order Input Referred Intermodulation Intercept (IIP3) 20 Input Power Intercept (dBm) Harmonic Distortion (dBc) -30 6 8 Supply Voltage (V) -0.5 0 DC Input Voltage 5 0.5 1 EL5397C - Preliminary EL5397C - Preliminary Triple 200MHz Fixed Gain Amplifier Typical Performance Curves 10 Output Voltage Swing vs Frequency THD<1% 10 Output Voltage Swing vs Frequency THD<0.1% RL=500Ω RL=150Ω 6 8 Output Voltage Swing (VPP) Output Voltage Swing (VPP) 8 4 2 RL=500Ω 6 RL=150Ω 4 2 AV=2 0 1 AV=2 10 Frequency (MHz) 0 100 Small Signal Step Response 1 10 Frequency (MHz) 100 Large Signal Step Response VS=±5V RL=150Ω AV=2 VS=±5V RL=150Ω AV=2 200mV/div 1V/div 10ns/div 10ns/div Settling Time vs Settling Accuracy Transimpedance (RoI) vs Temperature 25 625 AV=2 RL=150Ω VSTEP=5VP-P output 20 600 15 RoI (kΩ) Settling Time (ns) EL5397C - Preliminary EL5397C - Preliminary 10 550 5 0 0.01 575 0.1 525 -40 1 Settling Accuracy (%) 10 60 Die Temperature (°C) 6 110 160 Triple 200MHz Fixed Gain Amplifier Typical Performance Curves 6 Frequency Response (Gain) SO8 Package 90 AV=2 2 0 AV=1 -2 Phase (°) Normalized Magnitude (dB) AV=-1 Frequency Response (Phase) SO8 Package -6 -10 -90 -180 -270 RL=150Ω RL=150Ω -14 1M 10M 100M -360 1M 1G 10M Frequency (Hz) PSRR and CMRR vs Temperature 1G ICMR and IPSR vs Temperature 90 2 80 PSRR 1.5 ICMR/IPSR (µA/V) 70 PSRR/CMRR (dB) 100M Frequency (Hz) 60 CMRR 50 40 30 ICMR+ 1 IPSR 0.5 ICMR- 0 20 10 -40 10 60 110 -0.5 -40 160 10 Die Temperature (°C) 60 110 160 Die Temperature (°C) Offset Voltage vs Temperature Input Current vs Temperature 2 60 40 Input Current (µA) VOS (mV) 1 0 20 IB0 -20 IB+ -1 -40 -2 -40 10 60 110 -60 -40 160 Die Temperature (°C) 10 60 Die Temperature (°C) 7 110 160 EL5397C - Preliminary EL5397C - Preliminary Triple 200MHz Fixed Gain Amplifier Typical Performance Curves Positive Input Resistance vs Temperature Supply Current vs Temperature 60 5 50 Supply Current (mA) 4 RIN+ (kΩ) 40 30 20 3 2 1 10 0 -40 10 60 110 0 -40 160 110 160 Die Temperature (°C) Negative Output Swing vs Temperature for Various Loads Positive Output Swing vs Temperature for Various Loads -3.5 4.2 150Ω -3.6 4.1 1kΩ 4 -3.7 3.9 VOUT (V) VOUT (V) 60 10 Die Temperature (°C) 3.8 3.7 -3.8 -3.9 -4 150Ω 1kΩ -4.1 3.6 3.5 -40 60 10 110 -4.2 -40 160 110 160 Die Temperature (°C) Slew Rate vs Temperature Output Current vs Temperature 4000 130 Sink Slew Rate (V/µS) 125 120 60 10 Die Temperature (°C) IOUT (mA) EL5397C - Preliminary EL5397C - Preliminary Source 3500 3000 AV=2 RF=RG=500Ω RL=150Ω 115 -40 10 60 110 2500 -40 160 10 60 Die Temperature (°C) Die Temperature (°C) 8 110 160 Triple 200MHz Fixed Gain Amplifier Typical Performance Curves 1 Package Power Dissipation vs Ambient Temp. JEDEC JESD51-3 Low Effective Thermal Conductivity Test Board 0.9 909mW Power Dissipation (W) 0.8 11 0 0.7 0.6 633mW 0.5 SO 1 °C /W 6 QS OP 16 15 8° C/ W 0.4 0.3 0.2 0.1 0 0 25 50 75 100 125 150 Ambient Temperature (°C) 9 EL5397C - Preliminary EL5397C - Preliminary EL5397C - Preliminary EL5397C - Preliminary Triple 200MHz Fixed Gain Amplifier Pin Descriptions EL5396C 16-Pin SO & 16Pin QSOP Pin Name 1 INA+ Function Equivalent Circuit Non-inverting input, Channel A RG IN+ RF Circuit1 2 CEA Amplifier A enable CE Circuit 2 3 VS- Negative supply 4 CEB Amplifier B enable (Reference Circuit 2) 5 INB+ Non-inverting input, Channel B (Reference Circuit 1) 6 NC Not connected 7 CEC Amplifier C enable (Reference Circuit 2) 8 INC+ Non-inverting input, Channel C (Reference Circuit 1) 9 INC- Inverting input, Channel C (Reference Circuit 1) 10 OUTC Output, Channel C OUT RF Circuit 3 11 NC 12 INB- 13 OUTB 14 VS+ 15 OUTA 16 INA- Not connected Inverting input, Channel B (Reference Circuit 1) Output, Channel B (Reference Circuit 3) Positive supply Output, Channel A (Reference Circuit 3) Inverting input, Channel A (Reference Circuit 1) 10 IN- Triple 200MHz Fixed Gain Amplifier 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 EL5397C is a current-feedback operational amplifier that offers a wide -3dB bandwidth of 300MHz and a low supply current of 4mA per amplifier. The EL5397C 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 EL5397C 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 EL5397C the ideal choice for many low-power/highbandwidth applications such as portable, handheld, or battery-powered equipment. 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.) For varying bandwidth needs, consider the EL5191C with 1GHz on a 9mA supply current or the EL5192C 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 outlines. The EL5397C 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 not recommended around the inverting input pin of the amplifier. 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. Feedback Resistor Values The EL5397C 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 A V=2 with 2dB of peaking. With AV=-2, an RF of approximately 500Ω gives 175MHz of bandwidth with 0.2dB of peaking. Since the EL5397C 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 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, Because the EL5397C is a current-feedback amplifier, its gain-bandwidth product is not a constant for different closed-loop gains. This feature actually allows the EL5397C to maintain about the same -3dB bandwidth. As gain is increased, bandwidth decreases slightly while 11 EL5397C - Preliminary EL5397C - Preliminary EL5397C - Preliminary EL5397C - Preliminary Triple 200MHz Fixed Gain Amplifier 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. EL5397C has dG and dP specifications of 0.03% and 0.04°. Output Drive Capability In spite of its low 4mA of supply current, the EL5397C is capable of providing a minimum of ±120mA of output current. With a minimum of ±120mA of output drive, the EL5397C is capable of driving 50Ω loads to both rails, making it an excellent choice for driving isolation transformers in telecommunications applications. Supply Voltage Range and Single-Supply Operation The EL5397C 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 EL5397C will operate on dual supplies ranging from ±2.5V to ±5V. With single-supply, the EL5397C will operate from 5V to 10V. Driving Cables and Capacitive Loads 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 EL5397C has an input range which extends to within 2V of either supply. So, for example, on +5V supplies, the EL5397C has an input range which spans ±3V. The output range of the EL5397C 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. 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 EL5397C 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. Video Performance Current Limiting 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 EL5397C amplifier. Special circuitry has been incorporated in the EL5397C 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. The EL5397C 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 EL5397C, it is possible to exceed the 150°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 modified for the EL5397C to Video performance has also been measured with a 500Ω load at a gain of +1. Under these conditions, the 12 Triple 200MHz Fixed Gain Amplifier remain in the safe operating area. These parameters are calculated as follows: PDMAX for each amplifier can be calculated as follows: V OUTMAX PD MAX = ( 2 × V S × I SMAX ) + ( V S – V OUTMAX ) × ---------------------------R T JMAX = T MAX + ( θ JA × n × PD MAX ) L where: where: TMAX = Maximum Ambient Temperature VS = Supply Voltage θJA = Thermal Resistance of the Package ISMAX = Maximum Supply Current of 1A n = Number of Amplifiers in the Package VOUTMAX = Maximum Output Voltage (Required) RL = Load Resistance PDMAX = Maximum Power Dissipation of Each Amplifier in the Package 13 EL5397C - Preliminary EL5397C - Preliminary EL5397C - Preliminary EL5397C - Preliminary Triple 200MHz Fixed Gain Amplifier General Disclaimer Specifications contained in this data sheet are in effect as of the publication date shown. Elantec, Inc. reserves the right to make changes in the circuitry or specifications contained herein at any time without notice. Elantec, Inc. assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. September 19, 2001 WARNING - Life Support Policy Elantec, Inc. products are not authorized for and should not be used within Life Support Systems without the specific written consent of Elantec, Inc. Life Support systems are equipment intended to support or sustain life and whose failure to perform when properly used in accordance with instructions provided can be reasonably expected to result in significant personal injury or death. Users contemplating application of Elantec, Inc. Products in Life Support Systems are requested to contact Elantec, Inc. factory headquarters to establish suitable terms & conditions for these applications. Elantec, Inc.’s warranty is limited to replacement of defective components and does not cover injury to persons or property or other consequential damages. Elantec Semiconductor, Inc. 675 Trade Zone Blvd. Milpitas, CA 95035 Telephone: (408) 945-1323 (888) ELANTEC Fax: (408) 945-9305 European Office: +44-118-977-6020 Japan Technical Center: +81-45-682-5820 14 Printed in U.S.A.