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.