1 Features

• Ultra-low offset voltage: 10 μV

• Ultra-low drift: ±0.1 μV/°C

• High open-loop gain: 134 dB

• High common-mode rejection: 140 dB

• High power-supply rejection: 130 dB

• Low bias current: 1-nA maximum

• Wide supply range: ±2 V to ±18 V

• Low quiescent current: 800 μA/amplifier

• Single, dual, and quad versions

• Replaces OP-07, OP-77, and OP-177

• For similar performance with ±40-V overvoltage

protection, see the OPA2206

2 Applications

• Analog input module

• Weigh scale

• Temperature transmitter

• Pressure transmitter

• Data acquisition (DAQ)

• Lab and field instrumentation

• Battery test

3 Description

The OPAx277 series of precision operational

amplifiers replace the industry standard OP-177. The

OPAx277 devices offer improved noise, wider output

voltage swing, and are twice as fast with half the

quiescent current. Features include ultra-low offset

voltage and drift, low bias current, high commonmode

rejection, and high power supply rejection.

The OPAx277 operate from ±2-V to ±18-V supplies

with excellent performance. Unlike most op amps that

are specified at only one supply voltage, the OPAx277

series is specified for real-world applications; a single

limit applies over the ±5-V (10-V) to ±15-V (30-V)

supply range. High performance is maintained as the

amplifiers swing to the specified limits. Because the

initial offset voltage (±20 μV, maximum) is so low,

user adjustment is usually not required. However, the

single version (OPA277) provides external trim pins

for special applications.

The OPAx277 are easy to use and free from phase

inversion and the overload problems found in some

other op amps. These devices are unity-gain stable

and provide excellent dynamic behavior over a wide

range of load conditions. Dual and quad versions

feature completely independent circuitry for lowest

crosstalk and freedom from interaction, even when

overdriven or overloaded.