1 Features

• Best bandwidth and slew-rate-to-power ratio:

– gain-bandwidth product: 5.5 MHz

– Slew rate: 20 V/μs

– Low supply current: 475 μA (maximum)

• High precision:

– Very low offset: 150 μV (maximum)

– Very low offset drift: 1 μV/°C (maximum)

• Low input bias current: 2 pA

• Excellent noise performance:

– Very low voltage noise: 7 nV/√Hz

– Very low current noise: 0.8 fA/√ Hz

• Input-voltage range includes V– supply

• Single-supply operation: 4.5 V to 36 V

• Dual-supply operation: ±2.25 V to ±18 V

2 Applications

• Semiconductor test

• Lab and field instrumentation

• Source measurement unit (SMU)

• Weigh scale

• Intra-DC interconnect (metro)

• Merchant network and server PSU

• DC power supply, ac source, electronic load

• Data acquisition (DAQ)

3 Description

The OPA145 and OPA2145 (OPAx145) devices are

part of a family of low-power JFET input amplifier

that have excellent drift, low current noise, and picoampere

input bias current. These features make the

OPAx145 an excellent choice for amplifying small

signals from high-impedance sensors.

The rail-to-rail output swing interfaces to modern,

single-supply, precision, analog-to-digital converters

(ADCs) and digital-to-analog converters (DACs). In

addition, the input range that includes V– allows

designers to simplify power management and take

advantage of the single-supply, low-noise JFET

architecture.