OPAx397 Precision, Low-Offset-Voltage, Low-Noise, Low-Input-Bias-Current,

Rail-to-Rail I/O, e-trim™ Operational Amplifiers

1 Features

• Low offset voltage: ±60 µV (maximum)

• Low-drift: ±0.18 µV/°C

• Low input bias current: 10 fA

• Low noise: 4.4 nV√Hz at 10 kHz

• Low supply voltage operation: 1.7 V to 5.5 V

• Low quiescent current: 1.22 mA

• Fast settling: 0.75 µs (1 V to 0.1%)

• Fast slew rate: 4.5 V/µs

• High output current: +65/-55 mA short circuit

• Gain bandwidth: 13 MHz

• 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)

+

–

OPA397

3.3 V

+

–

OPA397

Optical Power

Monitor

Precision Current

Shunt Monitor

+

–

OPA397

Precision Current

Source

3.3 V

ADC

DAC

ADC

OPAx397 Applications in Optical Modules

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).

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.

Device Information

PART NUMBER

PACKAGE(1)

BODY SIZE (NOM)

OPA397

DSBGA (6)(3)

1.00 mm x 0.8 mm

SC-70 (5) (3)

2.00 mm x 1.25 mm

SOT-23 (5)

2.90 mm x 1.60 mm

OPA2397(2)

DSBGA (9)(3)

1.20 mm x 1.20 mm

VSSOP (8)(3)

3.00 mm x 3.00 mm

SOIC (8)(3)

4.90 mm x 3.90 mm

OPA4397(2)

TSSOP (14)(3)

5.00 mm x 4.40 mm

QFN (16)(3)

3.00 mm x 3.00 mm

(1)

For all available packages, see the package option

addendum at the end of the data sheet.

(2)

Device is preview.

(3)

Package is preview.

OPA397

SBOSA02 – AUGUST 2021

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.