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Single Supply, Rail to Rail Low Power FET-Input Op Amp AD820

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 EXCELLENT LOAD DRIVE Capacitive Load Drive Up to 350 pF Minimum Output Current of 15 mA EXCELLENT AC PERFORMANCE FOR LOW POWER 800 ␮A Max Quiescent Current Unity Gain Bandwidth: 1.8 MHz Slew Rate of 3.0 V/␮s EXCELLENT DC PERFORMANCE 800 ␮V Max Input Offset Voltage 1 ␮V/؇C Typ Offset Voltage Drift 25 pA Max Input Bias Current LOW NOISE 13 nV/√Hz @ 10 kHz APPLICATIONS Battery Powered Precision Instrumentation Photodiode Preamps Active Filters 12- to 14-Bit Data Acquisition Systems Medical Instrumentation Low Power References and Regulators

PRODUCT DESCRIPTION

The AD820 is a 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 with an input voltage range extending below the negative rail, allowing the AD820 to accommodate input signals below

CONNECTION DIAGRAMS 8-Pin Plastic Mini-DIP

NULL

1

–IN +IN

NC

1

+V S

–IN +IN

3

–V S 4

AD820

2

6 VOUT TOP VIEW (Not to Scale)

NC

5

3 4

8 7

AD820

2

–VS

8-Pin SOIC

NULL

8

NC

7

+VS

6 VOUT TOP VIEW (Not to Scale)

5

NC

ground in the single supply mode. Output voltage swing extends to within 10 mV of each rail providing the maximum output dynamic range. Offset voltage of 800 µV max, offset voltage drift of 1 µV/°C, typ 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/µs slew rate are provided for a low supply current of 800 µA. The AD820 drives up to 350 pF of direct capacitive load and provides a minimum output current of 15 mA. This allows the amplifier to handle a wide range of load conditions. This combination of ac and dc performance, plus the outstanding load drive capability, results in an exceptionally versatile amplifier for the single supply user. The AD820 is available in three performance grades. The A and B grades are rated over the industrial temperature range of –40°C to +85°C. There is 3 volt grade—the AD820A-3V, rated over the industrial temperature range. The AD820 is offered in two varieties of 8-pin package: plastic DIP, and surface mount (SOIC).

50 45 1V

1V

20µs

40 NUMBER OF UNITS

100

35

90

30 25 20 15 10

10

0%

5

1V

0 0

1

2

3 4 5 6 7 INPUT BIAS CURRENT – pA

8

9

10

Input Voltage Noise vs. Frequency

Gain of +2 Amplifier; VS = +5, 0, VIN = 2.5 V Sine Centered at 1.25 Volts

REV. A 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 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 Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703


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