1 Features
• Low offset voltage: ±60μV (maximum)
• Low-drift: ±0.18μV/°C
• Low input bias current: 10fA
• Low noise: 4.4nV√Hz at 10kHz
• Low 1/f noise: 2μVPP (0.1Hz to 10Hz)
• Low supply voltage operation: 1.7V to 5.5V
• Low quiescent current: 1.22mA
• Fast settling: 0.75μs (1V to 0.1%)
• Fast slew rate: 4.5V/μs
• High output current: +65/-55mA short circuit
• Gain bandwidth: 13MHz
• Rail-to-rail input and output
• Specified temperature range: –40°C to +125°C
• EMI/RFI filtered inputs

2 Applications
• Multiparameter patient monitor
• Electrocardiogram (ECG)
• Chemistry/gas analyzer
• Optical module
• Analog input module
• Process analytics (pH, gas, concentration, force
and humidity)
• Gas detector
• Analog security camera
• Merchant DC/DC
• Pulse oximeter
• Inter-DC interconnect (long-haul, submarine)
• Data acquisition (DAQ)

3 Description
The OPAx397 family of operational amplifiers
(OPA397, OPA2397, and OPA4397) features ultra-low
offset, offset drift, and input bias current with rail-to-rail
input and output operation. In addition to precision
dc accuracy, the ac performance is optimized for
low noise and fast-settling transient response. These
features make the OPAx397 an excellent choice
for driving high-precision analog-to-digital converters
(ADCs) or buffering the output of high-resolution,
digital-to-analog converters (DACs).
The OPAx397 feature TI's e-trim™ operational
amplifier technology to achieve ultra-low offset
voltage and offset voltage drift without any input
chopping or auto-zero techniques. This technique
enables ultra-low input bias current for sensor inputs
or photodiode current-to-voltage measurements,
creating high-performance transimpedance stages for
optical modules or medical instrumentation.