Ti offers an OPA320 and OPA2320 precision, 20 MHz, 0.9 pA, low noise, RRIO, CMOS operating amplifier, and shutdown

     Texas Instruments OPA320 (single) and OPA2320 (dual) are precision low-voltage CMOS operational amplifiers, which optimize very low noise and broadband, and operate at a low static current of only 1.45 mA. The OPA320 series is ideal for low power, single power applications. Low noise (7 nV/√ Hz) and high-speed operation also make them very suitable for driving sampling analog-to-digital converters (adcs). Other applications include signal conditioning and sensor amplification.

     The OPA320 has a linear input stage with zero cross distortion that provides excellent common mode rejection ratio (CMRR) over the entire input range, typically 114 dB. The input common mode range exceeds 100mv of the negative and positive power rails. The output voltage usually fluctuates within the 10mv range of the track.

     In addition, OPAx320 has a wide power supply voltage range from 1.8 V to 5.5 V, and has excellent PSRR (106 dB) in the entire power supply range, which makes them suitable for precise, low power consumption applications, running directly from the battery without adjustment.

     OPA320 (single version) can be packaged in 5-pin SOT23; The opa320 power-off single version can be packaged in a 6-pin SOT23. The dual OPA2320 provides 8-pin SOIC, VSSOP and SON packages, while the OPA2320 (dual with shutdown) provides 10 pin VSSOP packages.