1 Features

• Ultra-low offset voltage: ±2 μV (maximum, tested)

• Zero drift: ±0.003 μV/°C

• Low-input bias current: 150 pA (maximum, tested)

• Low noise: 8.5 nV√Hz at 1 kHz

• No 1/f noise: 177 nVPP (0.1 Hz to 10 Hz)

• Common-mode input range ±100 mV beyond

supply rails

• Gain bandwidth: 5.7 MHz

• Quiescent current: 570 μA per amplifier

• Single supply: 1.7 V to 5.5 V

• Dual supply: ±0.85 V to ±2.75 V

• EMI and RFI filtered inputs

2 Applications

• Electronic thermometer

• Weigh scale

• Temperature transmitter

• Ventilators

• Data acquisition (DAQ)

• Semiconductor test

• Lab and field instrumentation

• Merchant network and server PSU

• Analog input module

• Pressure transmitter

3 Description

The OPA387, OPA2387, and OPA4387 (OPAx387)

family of precision amplifiers offers state-of-the-art

performance. With zero-drift technology, the OPAx387

offset voltage and offset drift provide unparalleled

long-term stability. With a mere 570 μA of quiescent

current, the OPAx387 are able to achieve 5.7 MHz

of bandwidth, a broadband noise of 8.5 nV/√Hz,

and a 1/f noise at 177 nVPP. These specifications

are crucial to achieve extremely-high precision and

no degradation of linearity in 16-bit to 24-bit analog

to digital converters (ADCs). The OPAx387 feature

flat bias current over temperature; therefore, little to

no calibration is needed in high input impedance

applications over temperature.

All versions are specified over the industrial

temperature range of –40°C to +125°C.