OPA121 is a precision monolithic dielectrically- isolated FET (Difet ®) operational amplifier. Out- standing performance characteristics are now available for low-cost applications. Noise, bias current, voltage offset, drift, open-loop gain, common-mode rejection, and power supply rejection are superior to BIFET® amplifiers. Very low bias current is obtained by dielectric isolation with on-chip guarding. Laser-trimming of thin-film resistors gives very low offset and drift. Extremely low noise is achieved with new circuit design techniques (patented). A new cascode design allows high precision input specifica- tions and reduced susceptibility to flicker noise. Standard 741 pin configuration allows upgrading of existing designs to higher performance levels.
The document describes the Burr-Brown OPA121, a precision monolithic dielectrically-isolated FET (Difet) operational amplifier designed for low-cost applications. Key features include low noise (6nV/VHz typ at 10kHz), low bias current (5pA max), and high open-loop gain (110dB min). The device is available in TO-99, Plastic DIP, and SOIC packages.
| Noise Voltage (10kHz) | 6 nV/VHz typ |
|---|---|
| Bias Current | 5pA max |
| Offset Voltage | 2mV max |
| Drift | 3uV/°C typ |
| Open-Loop Gain | 110dB min |
| Common-Mode Rejection | 86dB min |
The typical noise voltage is 6nV/VHz at 10kHz.
The OPA121KM and KP operate from -40°C to +85°C, while the KU grade operates from -25°C to +85°C.