描述

 

The OPA145, OPA2145, and OPA4145 operational amplifier (op amp) family is a series of low-power JFET input amplifiers that feature excellent drift, low current noise, and pico-ampere input bias current, making these devices a suitable 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.

 

特性

 

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