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/s 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) The AD797 is also useful in infrared (IR) and sonar imaging 8 MHz bandwidth (G = 10) applications, where the widest dynamic range is necessary. The 280 kHz full power bandwidth at 20 V p-p low distortion and 16-bit settling time of the AD797 make it 20 V/s slew rate ideal for buffering the inputs to - ADCs or the outputs of Excellent dc precision high resolution DACs, especially when the device is used in 80 V maximum input offset voltage critical applications such as seismic detection or in spectrum 1.0 V/C V drift OS analyzers. Key features such as a 50 mA output current drive Specified for 5 V and 15 V power supplies and the specified power supply voltage range of 5 V to 15 V High output drive current of 50 mA make the AD797 an excellent general-purpose amplifier. APPLICATIONS 5 Professional audio preamplifiers IR, CCD, and sonar imaging systems 4 Spectrum analyzers Ultrasound preamplifiers 3 Seismic detectors - ADC/DAC buffers 2 1 0 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) 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 Rev. K Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 19922015 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. INPUT VOLTAGE NOISE (nV/ Hz) 00846-002AD797 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Noise and Source Impedance Considerations ........................... 12 Applications ....................................................................................... 1 Low Frequency Noise ................................................................ 12 General Description ......................................................................... 1 Wideband Noise ......................................................................... 12 Revision History ............................................................................... 2 Bypassing Considerations ......................................................... 13 Specif icat ions ..................................................................................... 3 The Noninverting Configuration ............................................. 13 Absolute Maximum Ratings ............................................................ 5 The Inverting Configuration .................................................... 14 Pin Configuration ............................................................................. 5 Driving Capacitive Loads .......................................................... 14 Thermal Resistance ...................................................................... 5 Settling Time ............................................................................... 14 ESD Caution .................................................................................. 5 Distortion Reduction ................................................................. 15 Typical Performance Characteristics ............................................. 6 Outline Dimensions ....................................................................... 18 Theory of Operation ...................................................................... 11 Ordering Guide .......................................................................... 19 REVISION HISTORY 3/15Rev. J to Rev. K 7/05Rev. D to Rev. E Changes to Figure 35 ...................................................................... 12 Updated Figure 1 Caption ................................................................ 1 Changes to Ordering Guide .......................................................... 19 Deleted Metallization Photo ............................................................ 6 Changes to Equation 1 ................................................................... 12 2/14Rev. I to Rev. J Updated Outline Dimensions ....................................................... 19 Changes to Power Supply Rejection Parameter, Table 2 ............. 3 Changes to Ordering Guide .......................................................... 20 3/13Rev. H to Rev. I 10/02Rev. C to Rev. D Added Figure 18 ................................................................................ 8 Deleted 8-Lead CERDIP Package (Q-8) ......................... Universal Edits to Specifications ....................................................................... 2 6/10Rev. G to Rev. H Edits to Absolute Maximum Ratings .............................................. 3 Added Table 1 Renumbered Sequentially .................................... 1 Edits to Ordering Guide ................................................................... 3 Moved Figure 1 to Absolute Maximum Ratings Section Edits to Table I ................................................................................... 9 Renumbered Sequentially ................................................................ 5 Deleted Operational Amplifiers Graphic .................................... 15 Updated Outline Dimensions ....................................................... 15 Changes to Table 3 ............................................................................ 5 Added Thermal Resistance Section and Table 4 .......................... 5 Moved Figure 3 to Typical Performance Characteristics Section .............................................................................................. 10 Change to Noise and Source Impedance Considerations Section .............................................................................................. 12 Changes to Ordering Guide .......................................................... 19 9/08Rev. F to Rev. G Changes to Input Common-Mode Voltage Range Parameter, Table 1 ................................................................................................ 3 1/08Rev. E to Rev. F Changes to Absolute Maximum Ratings ....................................... 5 Change to Equation 1 ..................................................................... 12 Changes to the Noninverting Configuration Section ................ 13 Updated Outline Dimensions ....................................................... 19 Changes to Ordering Guide .......................................................... 20 Rev. K Page 2 of 19