OPA928中文资料德州仪器数据手册PDF规格书

1 Features

• Ultra-low input bias current:

– 20fA (tested max) at 25ºC, VS = 16V

– 20fA (tested max) at 85ºC, VS = 16V

– 75fA (tested max) at 85ºC, VS = 36V

• Ultra-low noise:

– 0.07fA/√Hz at 0.1Hz

– 15nV/√Hz at 1kHz

• High dc precision:

– ±5μV input offset voltage

– ±0.1μV/°C offset voltage drift

• Integrated high-precision guard buffer

• Wide bandwidth: 2.5MHz GBW

• Low quiescent current: 275μA

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

• Rail-to-rail input and output

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

• Industry-standard SOIC package with low leakage

pin out

2 Applications

• Electrochemical meter, pH meter

• Lab and field Instrumentation

• Mass spectrometer

• Ion chromatography (IC) instrument

• Spectrophotometer

• Electrometer

• Coulomb counting

3 Description

The OPA928 is a new generation, 36V, femtoampere

input bias, e-trim™ operational amplifier. This device

offers an ultra-low input bias current of 20fA (max)

across the entire industrial temperature range, −40ºC

to +85ºC. The OPA928 input bias performance is

tested at production at both temperatures.

The near-zero input bias is complemented by

outstanding dc precision and ac performance,

including rail-to-rail input and output, low offset

voltage (±5μV, typical), low offset drift (±0.1μV/°C,

typical), and ultra-low current noise (0.07fA/√Hz

at 0.1Hz). These features make the OPA928 an

excellent choice for low-light photodiode and high

source-impedance applications.

The OPA928 features an internal, high precision

guard buffer to protect high impedance input

traces from undesirable current leakage in sensitive

applications. The OPA928 packaging and pin out is

designed to support low-leakage circuit designs.

The OPA928 is the next generation OPA128.