Software Programmable
Gain Amplifier
a
AD526
FEATURES
PIN CONFIGURATION
Digitally Programmable Binary Gains from 1 to 16
Two-Chip Cascade Mode Achieves Binary Gain from
1 to 256
DIG GND
NULL
1
2
3
4
5
6
7
8
16 A1
15 A0
Gain Error:
0.01% Max, Gain = 1, 2, 4 (C Grade)
0.02% Max, Gain = 8, 16 (C Grade)
0.5 ppm/؇C Drift Over Temperature
Fast Settling Time
10 V Signal Change:
0.01% in 4.5 s (Gain = 16)
Gain Change:
V
14
CS
IN
NULL
ANALOG GND 2
ANALOG GND 1
AD526
TOP VIEW
(Not to Scale)
13
12
11
10
9
CLK
A2
B
–V
S
+V
S
V
SENSE
V
FORCE
OUT
OUT
0.01% in 5.6 s (Gain = 16)
Low Nonlinearity: ؎0.005% FSR Max (J Grade)
Excellent DC Accuracy:
Offset Voltage: 0.5 mV Max (C Grade)
Offset Voltage Drift: 3 V/؇C (C Grade)
TTL-Compatible Digital Inputs
PRODUCT DESCRIPTION
APPLICATION HIGHLIGHTS
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.
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 Preamps: 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 cas-
cading two AD526s.
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.
ORDERING GUIDE
Temperature Package
Range
Package
Options
Model
Descriptions
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.
AD526JN
Commercial
Industrial
Industrial
Industrial
Military
16-Lead Plastic DIP N-16
AD526AD
AD526BD
AD526CD
AD526SD
AD526SD/883B
5962-9089401MEA* Military
16-Lead Cerdip
16-Lead Cerdip
16-Lead Cerdip
16-Lead Cerdip
16-Lead Cerdip
16-Lead Cerdip
D-16
D-16
D-16
D-16
D-16
D-16
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-lead plastic
DIP, and the other grades are offered in a 16-lead hermetic
side-brazed ceramic DIP.
Military
*Refer to official DESC drawing for tested specifications.
REV. D
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: 781/329-4700
Fax: 781/326-8703
World Wide Web Site: http://www.analog.com
© Analog Devices, Inc., 1999
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