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 61.5 V to 618 V

Excellent Load Drive

Capacitive Load Drive Up to 350 pF

Minimum Output Current of 15 mA

Excellent AC Performance for Low Power

800 mA Max Quiescent Current

Unity Gain Bandwidth: 1.8 MHz

Slew Rate of 3.0 V/ms

Excellent DC Performance

800 mV Max Input Offset Voltage

1 mV/8C 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

CONNECTION DIAGRAMS

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, 50 0 10 15 5 1 10 0 30 20 25 35 40 45 2 3 4 5 6 7 8 9 INPUT BIAS CURRENT – pA NUMBER OF UNITS Figure 1. Typical Distribution of Input Bias Current 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 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 V grade—the AD820A-3V, rated over the industrial temperature range.

The AD820 is offered in two varieties of 8-lead package: plastic DIP, and surface mount (SOIC).

ABSOLUTE MAXIMUM RATINGS¹

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V

Internal Power Dissipation²

Plastic DIP (N) . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 Watts

SOIC (R) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 Watts

Input Voltage . . . . . . . . . . . . . . (+VS + 0.2 V) to – (20 V + VS)

Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite

Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . ±30 V

Storage Temperature Range (N) . . . . . . . . . –65°C to +125°C

Storage Temperature Range (R) . . . . . . . . . –65°C to +150°C

Operating Temperature Range

AD820A/B . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C

Lead Temperature Range

(Soldering 60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . .+260°C

NOTES

1 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.

2 8-Lead Plastic DIP Package: θ_JA = 90°C/Watt

8-Lead SOIC Package: θ_JA = 160°C/Watt

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