OPA4325 CMOS Op-Amp

By Texas Instruments 107

OPA4325 CMOS Op-Amp

Texas Instruments' OPA4325 precision, low-voltage complementary metal-oxide semiconductor (CMOS) op-amps are optimized for ultra-low noise and wide bandwidth while operating on a low quiescent current of 650 µA.

The OPA4325 features a linear input stage with zero-crossover distortion that delivers excellent common-mode rejection ratio (CMRR) of typically 114 dB over the entire 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 combined with the wide bandwidth (10 MHz), the high slew rate (5 V/µs), and low noise (9 nV/√Hz) makes the OPA4325 an ideal successive-approximation register (SAR) analog-to-digital converter (ADC) input driver amp. The OPA4325 has a wide supply-voltage range from 2.2 V to 5.5 V with an excellent power-supply rejection ratio (PSRR) over the entire supply range making the device an ideal choice for precision, low-power applications that run directly from batteries without regulation.

The OPA4325 (quad-channel) is available in a TSSOP-14 package.

Features
  • Precision with zero-crossover distortion:
    • Low offset voltage: 150 µV (max)
    • High CMRR: 114 dB
    • Rail-to-rail I/O
  • Wide bandwidth: 10 MHz
  • Quiescent current: 650 µA/ch
  • Single-supply voltage range: 2.2 V to 5.5 V
  • Low input bias current: 0.2 pA
  • Low noise: 9 nV/√Hz at 10 kHz
  • Slew rate: 5 V/µS
  • Unity-gain stable
Applications
  • High-Z sensor signal conditioning
  • Transimpedance amps
  • Test and measurement equipment
  • Programmable logic controllers (PLCs)
  • Motor control loops
  • Communications
  • Input, output ADC, and DAC buffers
  • Active filters

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