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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

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 in audio bandwidths

give the AD797 the wide dynamic range necessary for preamps in microphones and mixing consoles. Furthermore, the AD797 has an excellent slew rate of 20 V/μs

and a 110 MHz gain bandwidth, which makes 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.