Precision, Low Power, Micropower

Dual Operational Amplifier

OP290

Rev. C

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FEATURES

Single-/dual-supply operation: 1.6 V to 36 V, ±0.8 V to ±18 V

True single-supply operation; input and output voltage

Input/output ranges include ground

Low supply current (per amplifier), 20 µA maximum

High output drive, 5 mA minimum

Low input offset voltage, 200 µV typical

High open-loop gain, 400 V/mV minimum

Outstanding PSRR, 5.6 µV/V maximum

Industry standard 8- ead dual pinout

PIN CONNECTIONS

OUT A

1

–IN A

2

+IN A

3

V–

4

V+

8

OUT B

7

–IN B

6

+IN B

5

OP290

–

+

A

–

+

B

Figure 1. PDIP (P-Suffix)

GENERAL DESCRIPTION

The OP290 is a high performance micropower dual op amp that

operates from a single supply of 1.6 V to 36 V or from dual

supplies of ±0.8 V to ±18 V. Input voltage range includes the

negative rail allowing the OP290 to accommodate input signals

down to ground in single-supply operation. The OP290 output

swing also includes ground when operating from a single

supply, enabling zero-in, zero-out operation.

The OP290 draws less than 20 μA of quiescent supply current

per amplifier, while being able to deliver over 5 mA of output

current to a load. Input offset voltage is below 200 μV, eliminat-

ing the need for external nulling. Gain exceeds 700,000 and

common-mode rejection is better than 100 dB. The power

supply rejection ratio of under 5.6 μV/V minimizes offset

voltage changes experienced in battery-powered systems. The

low offset voltage and high gain offered by the OP290 bring

precision performance to micropower applications. The

minimal voltage and current requirements of the OP290 suit it

for battery- and solar-powered applications, such as portable

instruments, remote sensors, and satellites. For a single op amp,

see the OP90; for a quad, see the OP490.

+IN

–IN

NULL

NULL

OUTPUT

V+

V–

ELECTRONICALLY ADJUSTED ON CHIP

FOR MINIMUM OFFSET VOLTAGE

Figure 2. Simplified Schematic (One of Two Amplifiers Is Shown)