The document describes the features and characteristics of a low noise precision differential field effect transistor operational amplifier.
The document describes the OPA111 as a monolithic dielectrically isolated FET (Difet) operational amplifier designed for critical instrumentation applications. Key features include very low input bias current, low noise performance, and superior common-mode rejection compared to BIFET amplifiers.
The datasheet provides comprehensive electrical specifications across various temperature ranges, including offset voltage, drift, bias current, open-loop gain, and frequency response. It also includes typical performance curves illustrating behavior under different conditions such as source resistance, supply voltage, and ambient temperature.
| Input Noise Voltage (10kHz) | 6 nV/√Hz max |
|---|---|
| Input Bias Current | 40.8 pA max |
| Offset Voltage | +500 µV max (25°C) |
| Open-Loop Gain | 114 dB min |
| Unity Gain Bandwidth | 2 MHz |
| Operating Temperature Range (OPA111BM) | -55°C to +125°C |
| Supply Voltage Range | +5V to +18VDC |
The typical input bias current is 40.8 pA when the input voltage is 0VDC.
The maximum input offset voltage is 250 microvolts.
The maximum input bias current is 1 picoampere.
The operating temperature range is from -55°C to +125°C.