1 Features

• Ultra-low offset voltage: ±0.25 μV

• Zero drift: ±0.005 μV/°C

• Zero crossover: 140-dB CMRR true RRIO

• Low noise: 7.0 nV√Hz at 1 kHz

• No 1/f noise: 140 nVPP (0.1 Hz to 10 Hz)

• Fast settling: 2 μs (1 V to 0.01%)

• Gain bandwidth: 10 MHz

• Single supply: 2.5 V to 5.5 V

• Dual supply: ±1.25 V to ±2.75 V

• True rail-to-rail input and output

• EMI/RFI filtered inputs

• Industry-standard packages:

– Single in SOIC-8, SOT-23-5, and VSSOP-8

– Dual in SOIC-8 and VSSOP-8

– Quad in SOIC-14 and TSSOP-14

2 Applications

• Merchant network and server PSU

• Notebook PC power adapter design

• Weigh scale

• Lab and field instrumentation

• Battery test

• Electronic thermometer

• Temperature transmitter

3 Description

The OPAx388 (OPA388, OPA2388, and OPA4388)

series of precision operational amplifiers are ultra-low

noise, fast-settling, zero-drift, zero-crossover devices

that provide rail-to-rail input and output operation.

These features and excellent ac performance,

combined with only 0.25 μV of offset and 0.005

μV/°C of drift over temperature, makes the OPAx388

a great choice for driving high-precision, analog-todigital

converters (ADCs) or buffering the output of

high-resolution, digital-to-analog converters (DACs).

This design results in excellent performance when

driving analog-to-digital converters (ADCs) without

degradation of linearity. The OPA388 (single version)

is available in the VSSOP-8, SOT23-5, and SOIC-8

packages. The OPA2388 (dual version) is offered in

the VSSOP-8 and SO-8 packages. The OPA4388

(quad version) is offered in the TSSOP-14 and

SO-14 packages. All versions are specified over the

industrial temperature range of –40°C to +125°C.