GENERAL DESCRIPTION
The AD797 is a very low noise, low distortion operational amplifier ideal for use as a preamplifier. The low noise of 0.9 nV/√Hz and low total harmonic distortion of −120 dB at audio bandwidths give the AD797 the wide dynamic range necessary for preamps in microphones and mixing consoles. Furthermore, the AD797’s excellent slew rate of 20 V/μs and 110 MHz gain bandwidth make it highly suitable for low frequency ultrasound applications.
The AD797 is also useful in infrared (IR) and sonar imaging applications, where the widest dynamic range is necessary. The low distortion and 16-bit settling time of the AD797 make it ideal for buffering the inputs to Σ-Δ ADCs or the outputs of high resolution DACs, especially when the device is used in critical applications such as seismic detection or in spectrum analyzers. Key features such as a 50 mA output current drive and the specified power supply voltage range of ±5 V to ±15 V make the AD797 an excellent general-purpose amplifier.

FEATURES
  Low noise
     0.9 nV/√Hz typical (1.2 nV/√Hz maximum) input voltage noise at 1 kHz
     50 nV p-p input voltage noise, 0.1 Hz to 10 Hz
  Low distortion
     −120 dB total harmonic distortion at 20 kHz
  Excellent ac characteristics
     800 ns settling time to 16 bits (10 V step)
     110 MHz gain bandwidth (G = 1000)
     8 MHz bandwidth (G = 10)
     280 kHz full power bandwidth at 20 V p-p
     20 V/μs slew rate
  Excellent dc precision
     80 μV maximum input offset voltage
     1.0 μV/°C VOS drift
  Specified for ±5 V and ±15 V power supplies
  High output drive current of 50 mA
 
APPLICATIONS
  Professional audio preamplifiers
  IR, CCD, and sonar imaging systems
  Spectrum analyzers
  Ultrasound preamplifiers
  Seismic detectors
  Σ-Δ ADC/DAC buffers