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.