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Instructions

The OPA928DR is a new generation 36V, femtoampere-input bias e-trim™ operational amplifier. The device provides ultra-low input bias currents of 20fA (maximum) over the entire industrial temperature range from −40°C to +85°C. The OPA928 input bias performance was tested in production at both temperatures.

In addition to near-zero input bias, the device has excellent DC accuracy and AC performance, including rail-to-rail input and output, low offset voltage (±5µV, typical), low temperature drift (±0.1µV/°C, typical), and ultra-low current noise (0.07fA/√Hz at 0.1Hz). These characteristics make the OPA928 ideal for low-light photodiodes and high-source impedance applications.

The OPA928 provides an internal high-precision protection buffer to protect high-impedance input wires from unwanted current leakage in sensitive applications. The OPA928 package and pin allocation are designed to support low leakage current circuit design.

Features

• Ultra-low input bias current:

- 20fA at 25°C, VS = 16V (maximum measured)

- 20fA at 85°C, VS = 16V (maximum measured)

- 75fA at 85°C, VS = 36V (maximum measured)

• Ultra-low noise:

- At 0.1Hz, the value is 0.07fA/√Hz

- 15nV/√Hz at 1kHz

• High DC accuracy

- ±5µV Input offset voltage

- ±0.1µV/°C Offset voltage drift

• Integrated high-precision protection buffer

• High bandwidth: 2.5MHz GBW

• Low static current: 275µA

• Wide supply voltage: ±2.25V to ±18V (4.5V to 36V)

• Track-to-track input and output

• Operating temperature range: -40 ºC to +125ºC

• Industry-wide SOIC package with low leakage pin arrangement

Applications

• Electrochemical meter, pH meter

• Laboratory and field instrumentation

• Mass Spectrometer

• Ion chromatography (IC) analyzer

• Spectrophotometer

• Electric meter

• Coulomb counting