Datasheet AD823A (Analog Devices)

Wide Supply Dual, 17 MHz, Rail-to-Rail FET Input Amplifier Data Sheet AD823A FEATURES CONNECTION DIAGRAM Single-supply operation OUT1 1 8 +VS Output swings rail-to-rail –IN1 2 7 OUT2 Input voltage range extends below ground +IN1 3 6 –IN2 Single-supply capability from 3 V to 36 V –V 4 5 +IN2 S
001
AD823A High load drive
9439- 0 Figure 1. 8-Lead SOIC
Capacitive load drive of 470 pF (G = +1, 25% overshoot) Linear output current of 40 mA, 0.5 V from supplies Excellent ac performance on 2.6 mA/amplifier AD823A −3 dB bandwidth of 17 MHz, G = +1 OUT1 1 8 +VS 325 ns settling time to 0.01% (2 V step) –IN1 2 7 OUT2 Slew rate of 30 V/μs +IN1 3 6 –IN2 Low distortion: −108 dBc at 20 kHz (G = −1, R –V 5 +IN2 L = 2 kΩ) S 4 Good dc performance
102
TOP VIEW
9- 43
(Not to Scale) 700 μV maximum input offset voltage
09 Figure 2. 8-Lead MSOP
1 μV/°C offset voltage drift 25 pA maximum input bias current VS = 3V Low noise: 14 nV/√Hz at 10 kHz CL = 50pF G = +1 No phase inversion with inputs to the supply rails 3.0V APPLICATIONS Photodiode preamps Active filters 1.5V 12-bit to 16-bit data acquisition systems Medical instrumentation Precision instrumentation 0V GENERAL DESCRIPTION
049 The AD823A is a dual precision, 17 MHz, JFET input op amp
500mV/DIV 200µs/DIV
39- 94 0 manufactured in the extra fast complementary bipolar (XFCB) Figure 3. Output Swing, +VS = +3 V, G = +1 process. The AD823A can operate from a single supply of 3 V This combination of ac and dc performance, plus the outstanding to 36 V or from dual supplies of ±1.5 V to ±18 V. It has true load drive capability, results in an exceptionally versatile ampli- single-supply capability with an input voltage range extending fier for applications such as ADC drivers, high speed active filters, below ground in single-supply mode. Output voltage swing extends and other low voltage, high dynamic range systems. to within 20 mV of each rail for IOUT ≤ 100 μA, providing outstanding output dynamic range. It also has a linear output The AD823A is available over the industrial temperature range current of 40 mA, 0.5 V from the supply rails. of −40°C to +85°C and is offered in an 8-lead SOIC package and an 8-lead MSOP package. An offset voltage of 700 μV maximum, an offset voltage drift of 1 μV/°C, and typical input bias currents of 0.3 pA provide dc precision with source impedances up to 1 GΩ. The AD823A provides 17 MHz, −3 dB bandwidth, and a 30 V/μs slew rate with a low supply current of only 2.6 mA per amplifier. It also provides low input voltage noise of 14 nV/√Hz and −108 dB SFDR at 20 kHz. The AD823A has low input capacitances (0.6 pF differ- ential and 1.3 pF common mode) and drives more than 500 pF of direct capacitive load as a follower. This lets the amplifier handle a wide range of load conditions.
Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 www.analog.com Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 ©2012 Analog Devices, Inc. All rights reserved.
Document Outline Features Applications General Description Connection Diagram Revision History Specifications 5 V Operation 3.3 V Operation ±15 V Operation Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Output Impedance Applications Information Input Characteristics Output Characteristics Wideband Photodiode Preamp Active Filter Maximizing Performance Through Proper Layout Outline Dimensions Ordering Guide