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Single-Supply, Rail-to-Rail Low Power FET-Input Op Amp AD822
FEATURES True Single-Supply Operation Output Swings Rail-to-Rail Input Voltage Range Extends Below Ground Single-Supply Capability from 3 V to 36 V Dual-Supply Capability from 1.5 V to 18 V High Load Drive Capacitive Load Drive of 350 pF, G = +1 Minimum Output Current of 15 mA Excellent AC Performance for Low Power 800 A Max QuiescentCurrent per Amplifier Unity Gain Bandwidth: 1.8 MHz Slew Rate of 3.0 V/ms Good DC Performance 800 V Max Input Offset Voltage 2 V/ C Typ Offset Voltage Drift 25 pA Max Input Bias Current Low Noise 13 nV/÷Hz @ 10 kHz No Phase Inversion APPLICATIONS Battery-Powered Precision Instrumentation Photodiode Preamps Active Filters 12- to 14-Bit Data Acquisition Systems Medical Instrumentation Low PowerReferences and Regulators GENERAL DESCRIPTION CONNECTION DIAGRAM 8-Lead Plastic DIP, MSOP, and SOIC
OUT1 1 –IN1 2 +IN1 3 V– 4 8 V+ 7 OUT2 6 –IN2

AD822

5 +IN2

with an input voltage range extending below the negative rail, allowing the AD822 to accommodate input signals below ground in the Single-Supply Mode. Output voltage swing extends to within 10 mV of each rail providing the maximumoutput dynamic range. Offset voltage of 800 mV maximum, offset voltage drift of 2 mV/∞C, input bias currents below 25 pA, and low input voltage noise provide dc precision with source impedances up to a gigaohm. 1.8 MHz unity gain bandwidth, –93 dB THD at 10 kHz, and 3 V/ms slew rate are provided with a low supply current of 800 mA per amplifier. The AD822 drives up to 350 pF of direct capacitive loadas a follower and provides a minimum output current of 15 mA. This allows the amplifier to handle a wide range of load conditions. Its combination of ac and dc performance, plus the outstanding load drive capability, results in an exceptionally versatile amplifier for the single-supply user. The AD822 is available in two performance grades. The A and B grades are rated over the industrialtemperature range of –40∞C to +85∞C. The AD822 is offered in three varieties of 8-lead packages: plastic PDIP, MSOP, and SOIC.

The AD822 is a dual precision, low power FET input op amp that can operate from a single supply of 3.0 V to 36 V or dual supplies of ± 1.5 V to ± 18 V. It has true single-supply capability
100

1V
INPUT VOLTAGE NOISE – nV/ HZ
100

1V

20µs

.... .... .... .... ........ .... .... .... ....

5V

90

.
10

VOUT

10 0%

.... .... .... .... .... .... .... .... .... .... 1V

0V (GND)
1 10 100 1k FREQUENCY – Hz 10k

Figure 1. Input Voltage Noise vs. Frequency

REV. E
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 ofpatents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective companies.

Figure 2. Gain-of-2 Amplifier; VS = 5, 0, VIN = 2.5 V Sine Centered at 1.25 V, RL = 100 kW

One Technology Way, P.O. Box 9106, Norwood, MA02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 2003 © Analog Devices, Inc. All rights reserved.

AD822–SPECIFICATIONS
Parameter DC PERFORMANCE Initial Offset Max Offset over Temperature Offset Drift Input Bias Current at TMAX Input Offset Current at TMAX Open-Loop Gain TMIN to TMAX

(VS = 0, 5 V @ TA = 25 C, VCM = 0 V, VOUT = 0.2 V, unless otherwise noted.)
MinAD822A Typ 0.1 0.5 2 2 0.5 2 0.5 500 400 80 80 15 10 1000 150 30 Max 0.8 1.2 25 5 20 500 400 80 80 15 10 Min AD822B Typ 0.1 0.5 2 2 0.5 2 0.5 1000 150 30 Max 0.4 0.9 10 2.5 10 Unit mV mV mV/∞C pA nA pA nA V/mV V/mV V/mV V/mV V/mV V/mV

Conditions

VCM = 0 V to 4 V

VO = 0.2 V to 4 V RL = 100 kW RL = 10 kW

TMIN to TMAX RL = 1 kW TMIN to TMAX NOISE/HARMONIC PERFORMANCE Input Voltage Noise 0.1...