ANALOG DEVICES OP290 Service Manual

Precision, Low Power, Micropower

OP290

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

00327-001

+IN

–IN

NULL

NULL

OUTPUT

V+

V–

ELECTRO NICALLY ADJUST E D ON CHIP
FOR MINIMUM OFFSET VOLTAGE

00327-002

FEATURES

Single-/dual-supply operation: 1.6 V to 36 V, ±0.8 V to ±18 V
Tru e 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-Mead dual pinout

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

Dual Operational Amplifier

PIN CONNECTIONS

Figure 1. PDIP (P-Suffix)

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.

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

Rev. C

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