Datasheet AD797 (Analog Devices)

Ultralow Distortion, Ultralow Noise Op Amp Data Sheet AD797 FEATURES GENERAL DESCRIPTION Low noise
The AD797 is a very low noise, low distortion operational amplifier
0.9 nV/√Hz typical (1.2 nV/√Hz maximum) input voltage
ideal for use as a preamplifier. The low noise of 0.9 nV/√Hz and
noise at 1 kHz
low total harmonic distortion of −120 dB in audio bandwidths
50 nV p-p input voltage noise, 0.1 Hz to 10 Hz
give the AD797 the wide dynamic range necessary for preamps
Low distortion
in microphones and mixing consoles.
−120 dB total harmonic distortion at 20 kHz
Furthermore, the AD797 has an excellent slew rate of 20 V/μs
Excellent ac characteristics
and a 110 MHz gain bandwidth, which makes it highly suitable
800 ns settling time to 16 bits (10 V step)
for low frequency ultrasound applications.
110 MHz gain bandwidth (G = 1000) 8 MHz bandwidth (G = 10)
The AD797 is also useful in infrared (IR) and sonar imaging
280 kHz full power bandwidth at 20 V p-p
applications, where the widest dynamic range is necessary. The
20 V/μs slew rate
low distortion and 16-bit settling time of the AD797 make it
Excellent dc precision
ideal for buffering the inputs to Σ-Δ ADCs or the outputs of
80 μV maximum input offset voltage
high resolution DACs, especially when the device is used in
1.0 μV/°C V
critical applications such as seismic detection or in spectrum
OS drift Specified for ±5 V and ±15 V power supplies
analyzers. Key features such as a 50 mA output current drive
High output drive current of 50 mA
and the specified power supply voltage range of ±5 V to ±15 V make the AD797 an excellent general-purpose amplifier.
APPLICATIONS 5 Professional audio preamplifiers IR, CCD, and sonar imaging systems ) 4 Spectrum analyzers /√Hz V (n Ultrasound preamplifiers E IS 3 Seismic detectors O N Σ-Δ ADC/DAC buffers E G TA 2 VOL T PU 1 IN 0
02 0
10 100 1k 10k 100k 1M 10M
6- 84
FREQUENCY (Hz)
00 Figure 1. AD797 Voltage Noise Spectral Density
Table 1. Low Noise Op Amps Voltage Noise 0.9 nV 1.1 nV 1.8 nV 2.8 nV 3.2 nV 3.8 nV
Single AD797 AD8597 ADA4004-1 AD8675/ADA4075-2 OP27 AD8671 Dual AD8599 ADA4004-2 AD8676 OP270 AD8672 Quad ADA4004-4 OP470 AD8674
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION THERMAL RESISTANCE ESD CAUTION TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION NOISE AND SOURCE IMPEDANCE CONSIDERATIONS LOW FREQUENCY NOISE WIDEBAND NOISE BYPASSING CONSIDERATIONS THE NONINVERTING CONFIGURATION THE INVERTING CONFIGURATION DRIVING CAPACITIVE LOADS SETTLING TIME DISTORTION REDUCTION Differential Line Receiver A General-Purpose ATE/Instrumentation I/O Driver Ultrasound/Sonar Imaging Preamp Amorphous (Photodiode) Detector Professional Audio Signal Processing—DAC Buffers OUTLINE DIMENSIONS ORDERING GUIDE