The OP400HSZ is a monolithic quad Operational Amplifier features OP77-type performance, extremely low input offset voltage of less than 150µV with a drift of less than 1.2µV/°C, guaranteed over the full military temperature range. Open-loop gain of the OP400 is more than 5 million into a 10kR load, input bias current is less than 3nA, CMR is more than 120dB and PSRR is less than 1.8µV/V. On-chip Zener zap trimming is used to achieve the low input offset voltage of the OP400 and eliminates the need for offset nulling. The OP400 conforms to the industry standard quad pinout, which does not have null terminals. The OP400 features low power consumption, drawing less than 725µA per amplifier. The total current drawn by this quad amplifier is less than that of a single OP07, yet the OP400 offers significant improvements over this industry-standard op amp. Voltage noise density of the OP400 is a low 11nV/√Hz at 10Hz, half that of most competitive devices.
