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.