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 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.
The AD820 is available in two performance grades. The A and B grades are rated over the industrial temperature range of −40°C to +85°C. The AD820 is offered in two 8-lead package options: plastic DIP (PDIP) and surface mount (SOIC).

ABSOLUTE MAXIMUM RATINGS

1. 8-lead plastic DIP package: θJA = 90°C/W
8-lead SOIC package: θJA = 160°C/W
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

PIN CONFIGURATIONS

Figure 1. 8-Lead PDIP Figure 2. 8-Lead SOIC


Figure 3. Gain of 2 Amplifier; VS = 5 V, 0 V, VIN = 2.5 V Sine Centered at 1.25 V

OUTLINE DIMENSIONS



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