Automotive-compliant precision low-noise op-amps

Automotive-compliant precision low-noise op-amps

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By Jean-Pierre Joosting

Diodes Incorporated is addressing the need for advanced signal conditioning in modern automotive designs by introducing two precision operational amplifiers (op-amps) aimed at different signal frequency scenarios. The low signal-to-noise ratio characteristics of the DIODES™ AS2376Q mean it is optimized for high frequency usage, such as in on-board chargers (OBCs), DC-DC converters, battery management system (BMS) implementations, pumps, airbags, position sensors and occupancy detection systems. The minimal quiescent current exhibited by the AS2333Q, launched in August, make it highly suited to addressing functions that continue even when the vehicle is inactive.

A 5.5 MHz bandwidth enables the AS2376Q op-amp to handle 50 kHz signals without significant loss of signal accuracy. Its low input noise density (7.5 nV/√Hz) and 0.8 µVpp frequency noise, coupled with rail-rail output, result in enhanced signal integrity. With 5 μV (typical) offset voltage, the AS2376Q supports a wide dynamic range. Supply voltages from 2.2 V to 5.5 V are accepted, enabling greater design-in flexibility.

The AS2333Q op-amp has a quiescent current of just 12 μA on each amplifier channel that allows it to be used in systems that have to remain live at all times. Excellent common-mode rejection ratio (CMRR) across its rail-rail input range coupled with near-zero drift over time and temperature provide long-term signal accuracy in wide common-mode rail precision applications. Its 1.8 V to 5.5 V supply voltage enables it to operate from 3.3 V and 5 V automotive rails.

The AS2376Q and AS2333Q op-amps are supplied in the SO-8 package. Both are qualified to AEC-Q100 Grade 1, are manufactured in IATF 16949 certified facilities, and support PPAP documentation.


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