Low Distortion, Wide Bandwidth a Voltage Feedback Clamp Amps AD8036/AD8037 FEATURES FUNCTIONAL BLOCK DIAGRAM Superb Clamping Characteristics 8-Lead Plastic DIP (N), Cerdip (Q), 3 mV Clamp Error and SO Packages 1.5 ns Overdrive Recovery Minimized Nonlinear Clamping Region AD8036/ NC 1 8 V 240 MHz Clamp Input Bandwidth H AD8037 3.9 V Clamp Input Range INPUT 2 7 +V S Wide Bandwidth AD8036 AD8037 6 OUTPUT +INPUT 3 Small Signal 240 MHz 270 MHz Large Signal (4 V p-p) 195 MHz 190 MHz V 5 4 V S L (Top View) Good DC Characteristics 2 mV Offset NC = NO CONNECT 10 V/ C Drift Ultralow Distortion, Low Noise large-signal bandwidths and ultralow distortion. The AD8036 72 dBc typ 20 MHz achieves 66 dBc at 20 MHz, and 240 MHz small-signal and 4.5 nV/Hz Input Voltage Noise 195 MHz large-signal bandwidths. The AD8036 and AD8037s High Speed recover from 2 clamp overdrive within 1.5 ns. These character- Slew Rate 1500 V/ s istics position the AD8036/AD8037 ideally for driving as well as Settling 10 ns to 0.1%, 16 ns to 0.01% buffering flash and high resolution ADCs. 3 V to 5 V Supply Operation In addition to traditional output clamp amplifier applications, the input clamp architecture supports the clamp levels as addi- APPLICATIONS tional inputs to the amplifier. As such, in addition to static dc ADC Buffer clamp levels, signals with speeds up to 240 MHz can be applied IF/RF Signal Processing to the clamp pins. The clamp values can also be set to any value High Quality Imaging within the output voltage range provided that V is greater that Broadcast Video Systems H V . Due to these clamp characteristics, the AD8036 and AD8037 Video Amplifier L can be used in nontraditional applications such as a full-wave Full Wave Rectifier rectifier, a pulse generator, or an amplitude modulator. These novel applications are only examples of some of the diverse PRODUCT DESCRIPTION applications which can be designed with input clamps. The AD8036 and AD8037 are wide bandwidth, low distortion clamping amplifiers. The AD8036 is unity gain stable. The The AD8036 is offered in chips, industrial (40C to +85C) AD8037 is stable at a gain of two or greater. These devices and military (55C to +125C) package temperature ranges allow the designer to specify a high (V ) and low (V ) output CH CL and the AD8037 in industrial. Industrial versions are available clamp voltage. The output signal will clamp at these specified in plastic DIP and SOIC MIL versions are packaged in cerdip. levels. Utilizing a unique patent pending CLAMPIN input 4 clamp architecture, the AD8036 and AD8037 offer a 10 AD8036 V = 3V H improvement in clamp performance compared to traditional 3 output clamping devices. In particular, clamp error is typically V = 2V H 2 3 mV or less and distortion in the clamp region is minimized. V = 1V This product can be used as a classical op amp or a clamp H 1 amplifier where a high and low output voltage are specified. 0 The AD8036 and AD8037, which utilize a voltage feedback V = 1V L architecture, meet the requirements of many applications which 1 previously depended on current feedback amplifiers. The AD8036 V = 2V L and AD8037 exhibit an exceptionally fast and accurate pulse 2 response (16 ns to 0.01%), extremely wide small-signal and V = 3V L 3 CLAMPIN is a trademark of Analog Devices, Inc. 4 4 3 2 1 0 1 2 3 4 INPUT VOLTAGE Volts Figure 1. Clamp DC Accuracy vs. Input Voltage REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. 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 Tel: 781/329-4700 World Wide Web Site: AD8036/AD8037SPECIFICATIONS ( V = 5 V R = 100 A = +1 (AD8036) A = +2 (AD8037), V , V open, unless S LOAD V V H L ELECTRICAL CHARACTERISTICS otherwise noted) AD8036A AD8037A Parameter Conditions Min Typ Max Min Typ Max Unit DYNAMIC PERFORMANCE Bandwidth (3 dB) Small Signal V 0.4 V p-p 150 240 200 270 MHz OUT 1 Large Signal 8036, V = 2.5 V p-p 8037, V = 3.5 V p-p 160 195 160 190 MHz OUT OUT Bandwidth for 0.1 dB Flatness V 0.4 V p-p OUT 8036, R = 140 8037, R = 274 130 130 MHz F F Slew Rate, Average +/ V = 4 V Step, 1090% 900 1200 1100 1500 V/ s OUT Rise/Fall Time V = 0.5 V Step, 1090% 1.4 1.2 ns OUT V = 4 V Step, 1090% 2.6 2.2 ns OUT Settling Time To 0.1% V = 2 V Step 10 10 ns OUT To 0.01% V = 2 V Step 16 16 ns OUT HARMONIC/NOISE PERFORMANCE 2nd Harmonic Distortion 2 V p-p 20 MHz, R = 100 59 52 52 45 dBc L R = 500 66 59 72 65 dBc L 3rd Harmonic Distortion 2 V p-p 20 MHz, R = 100 68 61 70 63 dBc L R = 500 72 65 80 73 dBc L 3rd Order Intercept 25 MHz 46 41 dBm Noise Figure R = 50 18 14 dB S Input Voltage Noise 1 MHz to 200 MHz 6.7 4.5 nVHz Input Current Noise 1 MHz to 200 MHz 2.2 2.1 pAHz Average Equivalent Integrated Input Noise Voltage 0.1 MHz to 200 MHz 95 60 V rms = 150 0.05 0.09 0.02 0.04 % Differential Gain Error (3.58 MHz) R L Differential Phase Error (3.58 MHz) R = 150 0.02 0.04 0.02 0.04 Degree L Phase Nonlinearity DC to 100 MHz 1.1 1.1 Degree CLAMP PERFORMANCE 2 Clamp Voltage Range V or V 3.3 3.9 3.3 3.9 V CH CL Clamp Accuracy 2 Overdrive, V = +2 V, V = 2 V 3 10 3 10 mV CH CL T T 20 20 mV MIN MAX 3 Clamp Nonlinearity Range 100 100 mV Clamp Input Bias Current (V or V ) 8036, V = 1 V 8037, V = 0.5 V 40 60 50 70 A H L H, L H, L T T 80 90 A MIN MAX Clamp Input Bandwidth (3 dB) V or V = 2 V p-p 150 240 180 270 MHz CH CL Clamp Overshoot 2 Overdrive, V or V = 2 V p-p 1 5 1 5 % CH CL Overdrive Recovery 2 Overdrive 1.5 1.3 ns 4 DC PERFORMANCE , R = 150 L 5 Input Offset Voltage 27 2 7 mV T T 11 10 mV MIN MAX Offset Voltage Drift 10 10 V/C Input Bias Current 410 3 9 A T T 15 15 A MIN MAX Input Offset Current 0.3 3 0.1 3 A T 55 A T MIN MAX Common-Mode Rejection Ratio V = 2 V 66 90 70 90 dB CM Open-Loop Gain V = 2.5 V 48 55 54 60 dB OUT T T 40 46 dB MIN MAX INPUT CHARACTERISTICS Input Resistance 500 500 k Input Capacitance 1.2 1.2 pF Input Common-Mode Voltage Range 2.5 2.5 V OUTPUT CHARACTERISTICS Output Voltage Range, R = 150 3.2 3.9 3.2 3.9 V L Output Current 70 70 mA Output Resistance 0.3 0.3 Short Circuit Current 240 240 mA POWER SUPPLY Operating Range 3.0 5.0 6.0 3.0 5.0 6.0 V Quiescent Current 20.5 21.5 18.5 19.5 mA T T 25 24 mA MIN MAX Power Supply Rejection Ratio T T 50 60 56 66 dB MIN MAX NOTES 1 See Max Ratings and Theory of Operation sections of data sheet. 2 See Max Ratings. 3 Nonlinearity is defined as the voltage delta between the set input clamp voltage (V or V ) and the voltage at which V starts deviating from V (see Figure 73). H L OUT IN 4 Measured at A = 50. V 5 Measured with respect to the inverting input. Specifications subject to change without notice. 2 REV. B