AD820ARZ-REEL7

FEATURES

True single-supply operation

Output swings rail-to-rail

Input voltage range extends below ground

Single-supply capability from 5 V to 36 V

Dual-supply capability from ±2.5 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 μA maximum quiescent current

Unity gain bandwidth: 1.8 MHz

Slew rate of 3.0 V/μs

Excellent dc performance

800 μV maximum input offset voltage

1 μV/°C typical offset voltage drift

25 pA maximum 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 

GENERAL DESCRIPTION

The AD820 is a precision, low power FET input op amp that

can operate from a single supply of 5.0 V to 36 V, or dual supplies

of ±2.5 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 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 maximum, offset voltage drift of

1 μV/°C, typical input bias currents below 25 pA, and low input

voltage noise provide dc precision with source impedances up

to 1 GΩ. 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. 

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