AD797B Analog Devices, AD797B Datasheet

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AD797B

Manufacturer Part Number
AD797B
Description
Manufacturer
Analog Devices
Datasheet

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a
PRODUCT 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
*Patent pending.
REV. C
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 rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FEATURES
Low Noise
Low Distortion
Excellent AC Characteristics
Excellent DC Precision
Specified for
High Output Drive Current of 50 mA
APPLICATIONS
Professional Audio Preamplifiers
IR, CCD, and Sonar Imaging Systems
Spectrum Analyzers
Ultrasound Preamplifiers
Seismic Detectors
0.9 nV/ Hz typ (1.2 nV/ Hz max) Input Voltage
50 nV p-p Input Voltage Noise, 0.1 Hz to 10 Hz
–120 dB Total Harmonic Distortion at 20 kHz
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/ s Slew Rate
80 V max Input Offset Voltage
1.0 V/ C V
ADC/DAC Buffers
Noise at 1 kHz
5
4
3
2
1
0
10
AD797 Voltage Noise Spectral Density
100
OS
5 V and
Drift
1k
FREQUENCY – Hz
15 V Power Supplies
10k
100k
1M
10M
necessary for preamps in microphones and mixing consoles.
Furthermore, the AD797’s excellent slew rate of 20 V/ s and
110 MHz gain bandwidth make it highly suitable for low fre-
quency ultrasound applications.
The AD797 is also useful in IR and Sonar Imaging applications
where the widest dynamic range is necessary. The low distor-
tion and 16-bit settling time of the AD797 make it ideal for
buffering the inputs to
tion DACs especially when they are used in critical applications
such as seismic detection and spectrum analyzers. Key features
such as a 50 mA output current drive and the specified power
supply voltage range of 5 to 15 volts make the AD797 an
excellent general purpose amplifier.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
–100
–110
–120
–130
–90
OFFSET NULL
100
Cerdip (Q) and SOIC (R) Packages
300
–V
+IN
–IN
S
8-Pin Plastic Mini-DIP (N),
CONNECTION DIAGRAM
Ultralow Noise Op Amp
1
2
3
4
1k
THD vs. Frequency
TOP VIEW
FREQUENCY – Hz
Ultralow Distortion,
AD797
ADCs or the outputs of high resolu-
3k
10k
8
7
6
5
DECOMPENSATION &
DISTORTION
NEUTRALIZATION
+V
OUTPUT
OFFSET NULL
MEASUREMENT
LIMIT
30k
S
AD797*
100k
Fax: 617/326-8703
300k
0.001
0.0003
0.0001

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AD797B Summary of contents

Page 1

... AD797 Voltage Noise Spectral Density *Patent pending. REV. C 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 rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices ...

Page 2

... 2 600 600 kHz –2– 1 AD797A/S AD797B Typ Max Min Typ Max 125/180 30 60 0.2 1.0 0.2 0.6 0.25 1.5 0.25 0.9 0.5 3.0 0.25 2.0 100 400 80 200 120 ...

Page 3

... Therefore, proper ESD precautions are recommended to avoid any performance degradation or loss of functionality. Model AD797AN –25 C)/ AD797BN JA AD797BR AD797BR-REEL AD797BR-REEL7 AD797AR AD797AR-REEL AD797AR-REEL7 5962-9313301MPA – +125 C METALIZATION PHOTO Contact factory for latest dimensions. Dimensions shown in inches and (mm). –3– AD797 ...

Page 4

AD797–Typical Characteristics SUPPLY VOLTAGE – ±Volts Figure 1. Common-Mode Voltage Range vs. Supply OUT –V OUT SUPPLY VOLTAGE – ±Volts Figure 2. Output ...

Page 5

SUPPLY VOLTAGE – ±Volts Figure 7. Quiescent Supply Current vs. Supply Voltage 12 FREQ = 1kHz R = 600 + ...

Page 6

AD797–Typical Characteristics 100 1k 10k FREQUENCY – Hz Figure 13. Input Voltage Noise Spectral Density 120 PHASE MARGIN 100 WITH GAIN 100Ω SEE FIGURE 22 ...

Page 7

AD797 6 OUT – SEE FIGURE 32 Figure 19. Inverter Connection 100 + OUT AD797 ...

Page 8

... MHz. This means new levels of perfor- mance for sampled data and imaging systems. All of this perfor- mance as well as load drive in excess are made possible by Analog Devices’ advanced Complementary Bipolar (CB) process. Another unique feature of this circuit is that the addition of a single capacitor, C tion due to the output stage ...

Page 9

... AD548, AD549, AD645, AD711, AD743/ AD745 REV. C LOW FREQUENCY NOISE Analog Devices specifies low frequency noise as a peak to peak (p-p) quantity bandwidth. Several tech- niques can be used to make this measurement. The usual tech- nique involves amplifying, filtering, and measuring the amplifiers ) ...

Page 10

AD797 BYPASSING CONSIDERATIONS To take full advantage of the very wide bandwidth and dynamic range capabilities of the AD797 requires some precautions. First, multiple bypassing is recommended in any precision application. A 1.0 F–4.7 F tantalum in parallel with 0.1 ...

Page 11

AD797 – SEE TEXT ** USE POWER SUPPLY BYPASSING SHOWN IN FIGURE 32. Figure 36. I-to-V Converter Connection ...

Page 12

AD797 TO TEKTRONIX OSCILLOSCOPE PREAMP INPUT SECTION 226 4.26k AD829 HP2835 0.47µ –V S 1kΩ 1kΩ 100Ω 1kΩ TEKTRONIX CALIBRATION FIXTURE V IN 1kΩ AD797 0.1µF ...

Page 13

Differential Line Receiver The differential receiver circuit of Figure 43 is useful for many applications from audio to MRI imaging. It allows extraction of a low level signal in the presence of common-mode noise. As shown in Figure 44, the ...

Page 14

AD797 Ultrasound/Sonar Imaging Preamp The AD600 variable gain amplifier provides the time controlled gain (TCG) function necessary for very wide dynamic range so- nar and low frequency ultrasound applications. Under some cir- cumstances necessary to buffer the input ...

Page 15

LOW VOLTAGE NOISE – nV kHz) N AUDIO PRECISION AMPLIFIERS AD797 OP275 SSM2015 SSM2016 SSM2017 SSM2134 SSM2139 FAST (Slew Rate 45 V/µs) OP61 OP467 (Quad) Faster (Slew Rate 230 V/µs) AD829 AD840 ULTRALOW V ...

Page 16

AD797 SEATING PLANE 0.010 (0.25) 0.004 (0.10) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Cerdip (Q) Package* 0.055 (1.4) MAX 0.005 (0.13) MIN 8 5 0.310 (7.87) 0.220 (5.59 0.070 (1.78) 0.030 (0.76) 0.320 (8.13) 0.290 (7.37) ...

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