AD526.PDF

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a
Software Programmable
Gain Amplifier
AD526
FEATURES
Digitally Programmable Binary Gains from 1 to 16
Two-Chip Cascade Mode Achieves Binary Gain from
1 to 256
Gain Error:
0.01% max, Gain = 1, 2, 4 (C Grade)
0.02% max, Gain = 8, 16 (C Grade)
0.5 ppm/
PIN CONFIGURATION
C Drift Over Temperature
Fast Settling Time
10 V Signal Change:
0.01% in 4.5
m
s (Gain = 16)
Gain Change:
0.01% in 5.6
m
s (Gain = 16)
0.005% FSR max (J Grade)
Excellent DC Accuracy:
Offset Voltage: 0.5 mV max (C Grade)
Offset Voltage Drift: 3
6
C (C Grade)
TTL Compatible Digital Inputs
m
V/
8
PRODUCT DESCRIPTION
The AD526 is a single-ended, monolithic software program-
mable gain amplifier (SPGA) that provides gains of 1, 2, 4, 8
and 16. It is complete, including amplifier, resistor network and
TTL-compatible latched inputs, and requires no external
components.
Low gain error and low nonlinearity make the AD526 ideal for
precision instrumentation applications requiring programmable
gain. The small signal bandwidth is 350 kHz at a gain of 16. In
addition, the AD526 provides excellent dc precision. The FET-
input stage results in a low bias current of 50 pA. A guaranteed
maximum input offset voltage of 0.5 mV max (C grade) and low
gain error (0.01%, G = 1, 2, 4, C grade) are accomplished using
Analog Devices’ laser trimming technology.
To provide flexibility to the system designer, the AD526 can be
operated in either latched or transparent mode. The force/sense
configuration preserves accuracy when the output is connected
to remote or low impedance loads.
The AD526 is offered in one commercial (0°C to +70°C) grade,
J, and three industrial grades, A, B and C, which are specified
from –40°C to +85°C. The S grade is specified from –55°C to
+125°C. The military version is available processed to MIL-
STD 883B, Rev C. The J grade is supplied in a 16-pin plastic
DIP, and the other grades are offered in a 16-pin hermetic side-
brazed ceramic DIP.
APPLICATION HIGHLIGHTS
1. Dynamic Range Extension for ADC Systems: A single
AD526 in conjunction with a 12-bit ADC can provide
96 dB of dynamic range for ADC systems .
2. Gain Ranging Pre-Amps: The AD526 offers complete
digital gain control with precise gains in binary steps from 1
to 16. Additional gains of 32, 64, 128 and 256 are possible
by cascading two AD526s .
ORDERING GUIDE
Temperature Package
Package
Model
Range
Description
Option
AD526JN
Commercial
16-Pin Plastic DIP N-16
AD526AD
Industrial
16-Pin Cerdip
D-16
AD526BD
Industrial
16-Pin Cerdip
D-16
AD526CD
Industrial
16-Pin Cerdip
D-16
AD526SD/883B
Military
16-Pin Cerdip
D-16
5962-9089401MEA*
*Refer to official DESC drawing for tested specifications.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
8
Low Nonlinearity:
11025638.003.png
AD526–SPECIFICATIONS (@ V S = 6 15 V, R L = 2 k V and T A = +25 8 C unless otherwise noted)
AD526J
AD526A
AD526B/S
AD526C
Model
Min
Typ
Max Min
Typ
Max Min
Typ
Max Min
Typ
Max Units
GAIN
Gain Range
(Digitally Programmable)
1, 2, 4, 8, 16
1, 2, 4, 8, 16
1, 2, 4, 8, 16
1, 2, 4, 8, 16
Gain Error
Gain = 1
0.05
0.02
0.01
0.01
%
Gain = 2
0.05
0.03
0.02
0.01
%
Gain = 4
0.10
0.03
0.02
0.01
%
Gain = 8
0.15
0.07
0.04
0.02
%
Gain = 16
0.15
0.07
0.04
0.02
%
Gain Error Drift
Over Temperature
G = 1
0.5
2.0
0.5
2.0
0.5
2.0
0.5
2.0
ppm/°C
G = 2
0.5
2.0
0.5
2.0
0.5
2.0
0.5
2.0
ppm/
°
C
G = 4
0.5
3.0
0.5
3.0
0.5
3.0
0.5
3.0
ppm/
°
C
G = 8
0.5
5.0
0.5
5.0
0.5
5.0
0.5
5.0
ppm/°C
G = 16
1.0
5.0
1.0
5.0
1.0
5.0
1.0
5.0
ppm/°C
Gain Error (T MIN to T MAX )
Gain = 1
0.06
0.03
0.02
0.015 %
Gain = 2
0.06
0.04
0.03
0.015 %
Gain = 4
0.12
0.04
0.03
0.015 %
Gain = 8
0.17
0.08
0.05
0.03
%
Gain = 16
0.17
0.08
0.05
0.03
%
Nonlinearity
Gain = 1
0.005
0.005
0.005
0.0035 % FSR
Gain = 2
0.001
0.001
0.001
0.001 % FSR
Gain = 4
0.001
0.001
0.001
0.001 % FSR
Gain = 8
0.001
0.001
0.001
0.001 % FSR
Gain = 16
0.001
0.001
0.001
0.001 % FSR
Nonlinearity (T MIN to T MAX )
Gain = 1
0.01
0.01
0.01
0.007 % FSR
Gain = 2
0.001
0.001
0.001
0.001 % FSR
Gain = 4
0.001
0.001
0.001
0.001 % FSR
Gain = 8
0.001
0.001
0.001
0.001 % FSR
Gain = 16
0.001
0.001
0.001
0.001 % FSR
VOLTAGE OFFSET, ALL GAINS
Input Offset Voltage
0.4
1.5
0.25
0.7
0.25
0.5
0.25
0.5
mV
Input Offset Voltage Drift Over
Temperature
5
20
3
10
3
10
3
10
V/
°
C
Input Offset Voltage
T MIN to T MAX
2.0
1.0
0.8
0.8
mV
Input Offset Voltage vs. Supply
(V S ± 10%)
80
80
84
90
dB
INPUT BIAS CURRENT
Over Input Voltage Range
±
10 V
50
150
50
150
50
150
50
150
pA
ANALOG INPUT
CHARACTERISTICS
Voltage Range
(Linear Operation)
6 10
± 12
6 10
± 12
6 10
± 12
6 10
± 12
V
Capacitance
5
5
5
5
pF
RATED OUTPUT
Voltage
6 10
± 12
6 10
± 12
6 10
± 12
6 10
± 12
V
Current (V OUT = ± 10 V)
6
± 10
6 5
± 10
6 5
± 10
6 5
± 10
mA
Short-Circuit Current
15
30
15
30
15
30
15
30
mA
DC Output Resistance
0.002
0.002
0.002
0.002
W
Load Capacitance
(For Stable Operation)
700
700
700
700
pF
NOISE, ALL GAINS
Voltage Noise, RTI
0.1 Hz to 10 Hz
3
3
3
3
mV p-p
Voltage Noise Density, RTI
f = 10 Hz
70
70
70
70
nV
ÖHz
f = 100 Hz
60
60
60
60
nV
Ö
Hz
f = 1 kHz
30
30
30
30
nVÖHz
f = 10 kHz
25
25
25
35
nVÖHz
–2–
REV. C
m
11025638.004.png 11025638.005.png
AD526
AD526J
AD526A
AD526B/S
AD526C
Model
Min
Typ
Max Min
Typ Max Min
Typ
Max
Min Typ Max Units
DYNAMIC RESPONSE
–3 dB Bandwidth (Small Signal)
G = 1
4.0
4.0
4.0
4.0
MHz
G = 2
2.0
2.0
2.0
2.0
MHz
G = 4
1.5
1.5
1.5
1.5
MHz
G = 8
0.65
0.65
0.65
0.65
MHz
G = 16
0.35
0.35
0.35
0.35
MHz
Signal Settling Time to 0.01%
(
D
V OUT =
±
10 V)
G = 1
2.1
4
2.1
4
2.1
4
2.1 4
m
s
G = 2
2.5
5
2.5
5
2.5
5
2.5 5
m
s
G = 4
2.7
5
2.7
5
2.7
5
2.7 5
m
s
G = 8
3.6
7
3.6
7
3.6
7
3.6 7
m
s
G = 16
4.1
7
4.1
7
4.1
7
4.1 7
m
s
Full Power Bandwidth
G = 1, 2, 4
0.10
0.10
0.10
0.10
MHz
G = 8, 16
0.35
0.35
0.35
0.35
MHz
Slew Rate
G = 1, 2, 4
4
6
4
6
4
6
4
6
V/
m
s
G = 8, 16
18
24
18
24
18
24
18
24
V/
m
s
DIGITAL INPUTS
(T MIN to T MAX )
Input Current (V H = 5 V)
60
100
140
60
100
140
60
100
140
60
100 140
m
A
Logic “1”
2
6
2
6
2
6
2
6
V
Logic “0”
0
0.8
0
0.8
0
0.8
0
0.8
V
TIMING 1
(V L = 0.2 V, V H = 3.7 V)
A0, A1, A2
T C
50
50
50
50
ns
T S
30
30
30
30
ns
T H
30
30
30
30
ns
B
T C
50
50
50
50
ns
T S
40
40
40
40
ns
T H
10
10
10
30
ns
TEMPERATURE RANGE
Specified Performance
0
+70
–40
+85 –40/–55
+85/+125 –40
+85
°
C
Storage
–65
+125 –65
+150 –65
+150
–65
+150
°
C
POWER SUPPLY
Operating Range
6 4.5
6 16.5
6 4.5
6 16.5
6 4.5
6 16.5
6 4.5
6 16.5 V
Positive Supply Current
10
14
10
14
10
14
10
14
mA
Negative Supply Current
10
13
10
13
10
13
10
13
mA
PACKAGE OPTIONS
Plastic (N-16)
AD526JN
AD526AD
AD526BD AD526SD
AD526CD
AD526SD/883B
NOTES
1 Refer to Figure 25 for definitions. FSR = Full Scale Range = 20 V. RTI = Referred to Input.
Specifications subject to change without notice.
Specifications shown in boldface are tested on all production units at final electrical test. All min and max specifications are guaranteed, although only those shown in
boldface are tested on all production units.
REV. C
–3–
Ceramic DIP (D-16)
11025638.006.png
AD526–Typical Characteristics
–4–
REV. C
11025638.001.png
AD526
*For Settling Time Traces, 0.01% = 1/2 Vertical Division
REV. C
–5–
11025638.002.png

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