OPA325 Low-Noise 10 MHz, Zero Crossover Precision CMOS Op-Amp

Texas Instruments' OPA325 is a precision, low-voltage complementary metal-oxide-semiconductor (CMOS) op-amp that is optimized for ultra-low noise and wide bandwidth while operating on a low quiescent current of 650 µA.

The OPA325 features a linear input stage with zero-crossover distortion that delivers excellent common-mode rejection ratio (CMRR) of typically 114 dB over the input range. The input common-mode range extends 100 mV beyond the negative and positive supply rails. The output voltage typically swings within 10 mV of the rails.

The zero-crossover distortion, wide bandwidth (10 MHz), high slew rate (5 V/µs), and low noise (9 nV/√Hz) make the OPA325 an ideal successive-approximation register (SAR) analog-to-digital converter (ADC) input driver amp. The OPA325 offers a wide supply voltage range of 2.2 V to 5.5 V with excellent power-supply rejection ratio (PSRR) over the supply range. This makes the op-amp an excellent choice for precision, low-power applications that run directly from batteries without regulation. The OPA325 (single-channel) is available in the SOT23-5 package.