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Электронный компонент: 5962-9313301MPA

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CONNECTION DIAGRAM
8-Pin Plastic Mini-DIP (N),
Cerdip (Q) and SOIC (R) Packages
1
2
3
4
8
7
6
5
AD797
DECOMPENSATION &
DISTORTION
NEUTRALIZATION
OUTPUT
OFFSET NULL
IN
+IN
+V
S
V
S
OFFSET NULL
TOP VIEW
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.
a
Ultralow Distortion,
Ultralow Noise Op Amp
AD797*
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
FEATURES
Low Noise
0.9 nV/
Hz typ (1.2 nV/
Hz max) 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/ s Slew Rate
Excellent DC Precision
80 V max Input Offset Voltage
1.0 V/ C V
OS
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
ADC/DAC Buffers
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
5
0
10M
3
1
100
2
10
4
1M
100k
10k
1k
FREQUENCY Hz
INPUT VOLTAGE NOISE nV/
Hz
AD797 Voltage Noise Spectral Density
*Patent pending.
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
ADCs or the outputs of high resolu-
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.
90
130
300k
120
300
100
110
100
100k
30k
10k
3k
1k
FREQUENCY Hz
THD dB
MEASUREMENT
LIMIT
0.001
0.0003
0.0001
THD %
THD vs. Frequency
REV. C
2
AD797SPECIFICATIONS
(@ T
A
= +25 C and V
S
= 15 V dc, unless otherwise noted)
AD797A/S
1
AD797B
Model
Conditions
V
S
Min
Typ
Max
Min
Typ
Max
Units
INPUT OFFSET VOLTAGE
5 V,
15 V
25
80
10
40
V
T
MIN
to T
MAX
50
125/180
30
60
V
Offset Voltage Drift
5 V,
15 V
0.2
1.0
0.2
0.6
V/
C
INPUT BIAS CURRENT
5 V,
15 V
0.25
1.5
0.25
0.9
A
T
MIN
to T
MAX
0.5
3.0
0.25
2.0
A
INPUT OFFSET CURRENT
5 V,
15 V
100
400
80
200
nA
T
MIN
to T
MAX
120
600/700
120
300
nA
OPEN-LOOP GAIN
V
OUT
=
10 V
15 V
R
LOAD
= 2 k
1
20
2
20
V/
V
T
MIN
to T
MAX
1
6
2
10
V/
V
R
LOAD
= 600
1
15
2
15
V/
V
T
MIN
to T
MAX
1
5
2
7
V/
V
@ 20 kHz
2
14000
20000
14000 20000
V/V
DYNAMIC PERFORMANCE
Gain Bandwidth Product
G = 1000
15 V
110
110
MHz
G = 1000
2
15 V
450
450
MHz
3 dB Bandwidth
G = 10
15 V
8
8
MHz
Full Power Bandwidth
3
V
O
= 20 V p-p,
R
LOAD
= 1 k
15 V
280
280
kHz
Slew Rate
R
LOAD
= 1 k
15 V
12.5
20
12.5
20
V/
s
Settling Time to 0.0015%
10 V Step
15 V
800
1200
800
1200
ns
COMMON-MODE REJECTION
V
CM
= CMVR
5 V,
15 V
114
130
120
130
dB
T
MIN
to T
MAX
110
120
114
120
dB
POWER SUPPLY REJECTION
V
S
=
5 V to
18 V
114
130
120
130
dB
T
MIN
to T
MAX
110
120
114
120
dB
INPUT VOLTAGE NOISE
f = 0. 1 Hz to 10 Hz
15 V
50
50
nV p-p
f = 10 Hz
15 V
1.7
1.7
2.5
nV/
Hz
f = 1 kHz
15 V
0.9
1.2
0.9
1.2
nV/
Hz
f = 10 Hz1 MHz
15 V
1.0
1.3
1.0
1.2
V rms
INPUT CURRENT NOISE
f = 1 kHz
15 V
2.0
2.0
pA/
Hz
INPUT COMMON-MODE
15 V
11
12
11
12
V
VOLTAGE RANGE
5 V
2.5
3
2.5
3
V
OUTPUT VOLTAGE SWING
R
LOAD
= 2 k
15 V
12
13
12
13
V
R
LOAD
= 600
15 V
11
13
11
13
V
R
LOAD
= 600
5 V
2.5
3
2.5
3
V
Short-Circuit Current
5 V,
15 V
80
80
mA
Output Current
4
5 V,
15 V
30
50
30
50
mA
TOTAL HARMONIC DISTORTION
R
LOAD
= 1 k
, C
N
= 50 pF
15 V
98
90
98
90
dB
f = 250 kHz, 3 V rms
R
LOAD
= 1 k
15 V
120
110
120 110
dB
f = 20 kHz, 3 V rms
INPUT CHARACTERISTICS
Input Resistance (Differential)
7.5
7.5
k
Input Resistance (Common Mode)
100
100
M
Input Capacitance (Differential)
5
20
20
pF
Input Capacitance (Common Mode)
5
5
pF
OUTPUT RESISTANCE
A
V
= +1, f = 1 kHz
3
3
m
POWER SUPPLY
Operating Range
5
18
5
18
V
Quiescent Current
5 V,
15 V
8.2
10.5
8.2
10.5
mA
NOTES
1
See standard military drawing for 883B specifications.
2
Specified using external decompensation capacitor, see Applications section.
3
Full Power Bandwidth = Slew Rate/2
V
PEAK
.
4
Output Current for |V
S
V
OUT
| >4 V, A
OL
> 200 k
.
5
Differential input capacitance consists of 1.5 pF package capacitance and 18.5 pF from the input differential pair.
Specifications subject to change without notice.
AD797
REV. C
3
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18 V
Internal Power Dissipation @ +25
C
2
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V
S
Differential Input Voltage
3
. . . . . . . . . . . . . . . . . . . . . .
0.7 V
Output Short Circuit Duration . . . . . . . Indefinite Within max
Internal Power Dissipation
Storage Temperature Range (Cerdip) . . . . . . 65
C to +150
C
Storage Temperature Range (N, R Suffix) . . 65
C to +125
C
Operating Temperature Range
AD797A/B . . . . . . . . . . . . . . . . . . . . . . . . . 40
C to +85
C
AD797S . . . . . . . . . . . . . . . . . . . . . . . . . . 55
C to +125
C
Lead Temperature Range (Soldering 60 sec) . . . . . . . +300
C
NOTES
1
Stresses above those listed under "Absolute Maximum Ratings" may cause
permanent damage to the device. This is a stress rating only, and functional
operation of the device at these or any other conditions above those indicated in the
operational section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
2
Internal Power Dissipation:
8-Pin SOIC = 0.9 Watts (T
A
25
C)/
JA
8-Pin Plastic DIP and Cerdip = 1.3 Watts (T
A
25
C)/
JA
Thermal Characteristics
8-Pin Plastic DIP Package:
JA
= 95
C/W
8-Pin Cerdip Package:
JA
= 110
C/W
8-Pin Small Outline Package:
JA
= 155
C/W
3
The AD797's inputs are protected by back-to-back diodes. To achieve low noise,
internal current limiting resistors are not incorporated into the design of this
amplifier. If the differential input voltage exceeds
0.7 V, the input current should
be limited to less than 25 mA by series protection resistors. Note, however, that this
will degrade the low noise performance of the device.
ESD SUSCEPTIBILITY
ESD (electrostatic discharge) sensitive device. Electrostatic
charges as high as 4000 volts, which readily accumulate on the
human body and on test equipment, can discharge without
detection. Although the AD797 features proprietary ESD pro-
tection circuitry, permanent damage may still occur on these
devices if they are subjected to high energy electrostatic dis-
charges. Therefore, proper ESD precautions are recommended
to avoid any performance degradation or loss of functionality.
METALIZATION PHOTO
Contact factory for latest dimensions.
Dimensions shown in inches and (mm).
NOTE
The AD797 has double layer metal. Only one layer is shown here for clarity.
ORDERING GUIDE
Temperature
Package
Package
Model
Range
Description
Option
AD797AN
40
C to +85
C
8-Pin Plastic DIP
N-8
AD797BN
40
C to +85
C
8-Pin Plastic DIP
N-8
AD797BR
40
C to +85
C
8-Pin Plastic SOIC
SO-8
AD797BR-REEL
40
C to +85
C
8-Pin Plastic SOIC
SO-8
AD797BR-REEL7
40
C to +85
C
8-Pin Plastic SOIC
SO-8
AD797AR
40
C to +85
C
8-Pin Plastic SOIC
SO-8
AD797AR-REEL
40
C to +85
C
8-Pin Plastic SOIC
SO-8
AD797AR-REEL7
40
C to +85
C
8-Pin Plastic SOIC
SO-8
5962-9313301MPA
55
C to +125
C
8-Pin Cerdip
Q-8
AD797Typical Characteristics
4
REV. C
HORIZONTAL SCALE 5 sec/DIV
VERTICAL SCALE 0.01
V/DIV
Figure 4. 0.1 Hz to 10 Hz Noise
60
140
40
100
120
80
60
40
20
0
20
2.0
1.5
1.0
0.5
0.0
INPUT BIAS CURRENT
A
TEMPERATURE
C
Figure 5. Input Bias Current vs. Temperature
140
140
100
60
40
80
60
120
120
100
80
60
40
20
0
20
40
TEMPERATURE
C
SHORT CIRCUIT CURRENT mA
SOURCE CURRENT
SINK CURRENT
Figure 6. Short Circuit Current vs. Temperature
20
0
0
20
15
5
5
10
10
15
INPUT COMMON-MODE RANGE Volts
SUPPLY VOLTAGE Volts
Figure 1. Common-Mode Voltage Range vs. Supply
OUTPUT VOLTAGE SWING Volts
20
0
0
20
15
5
5
10
10
15
SUPPLY VOLTAGE Volts
V
OUT
+V
OUT
Figure 2. Output Voltage Swing vs. Supply
OUTPUT VOLTAGE SWING Volts p-p
LOAD RESISTANCE
30
10
0
10
100
10k
1k
20
V = 5V
S
V = 15V
S
Figure 3. Output Voltage Swing vs. Load Resistance
AD797
REV. C
5
20
5
0
15
10
SUPPLY VOLTAGE Volts
11
6
9
7
8
10
+125C
+25C
55C
QUIESCENT SUPPLY CURRENT mA
Figure 7. Quiescent Supply Current vs. Supply Voltage
12
0
0
20
9
3
5
6
10
15
SUPPLY VOLTAGE Volts
OUTPUT VOLTAGE Volts rms
FREQ = 1kHz
R
L
= 600
G = +10
Figure 8. Output Voltage vs. Supply for 0.01% Distortion
1.0
0.0
10
0.6
0.2
2
0.4
0
0.8
8
6
4
0.0015%
0.01%
STEP SIZE Volts
SETTLING TIME
s
Figure 9. Settling Time vs. Step Size (
)
20
1M
80
40
10
60
1
120
100
100k
10k
1k
100
140
50
75
100
125
150
CMR
POWER SUPPLY REJECTION dB
COMMON MODE REJECTION dB
FREQUENCY Hz
PSR
SUPPLY
PSR
+SUPPLY
Figure 10. Power Supply and Common-Mode Rejection
vs. Frequency
60
100
120
0.01
0.1
10
1.0
80
R
L
= 600
G = +10
FREQ = 10kHz
NOISE BW = 100kHz
V
S
= 5V
= 15V
V
S
OUTPUT LEVEL Volts
THD + NOISE dB
Figure 11. Total Harmonic Distortion (THD) + Noise vs.
Output Level
Figure 12. Large Signal Frequency Response
30
10
0
10k
100k
10M
1M
20
5V SUPPLIES
15V SUPPLIES
R
L
= 600