AD526 Datasheet, PDF (1/14 Pages) Analog Devices – Software Programmable Gain Amplifier

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/؇C Drift Over Temperature
Fast Settling Time
10 V Signal Change:
0.01% in 4.5 ␮s (Gain = 16)
Gain Change:
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
PIN CONFIGURATION
DIG GND 1
16 A1
NULL 2
15 A0
V_IN 3
14 CS
NULL 4 AD526 13 CLK
TOP VIEW
ANALOG GND 2 5 _{(Not to Scale)} 12 A2
ANALOG GND 1 6
11 B
–V_S 7
V_OUT SENSE 8
10 +V_S
9 V_OUT FORCE
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-lead plastic
DIP, and the other grades are offered in a 16-lead 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 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.
ORDERING GUIDE
Model
Temperature Package
Range
Descriptions
Package
Options
AD526JN
Commercial
AD526AD
Industrial
AD526BD
Industrial
AD526CD
Industrial
AD526SD
Military
AD526SD/883B
Military
5962-9089401MEA* Military
16-Lead Plastic DIP N-16
16-Lead Cerdip D-16
16-Lead Cerdip D-16
16-Lead Cerdip D-16
16-Lead Cerdip D-16
16-Lead Cerdip D-16
16-Lead Cerdip D-16
*Refer to official DESC drawing for tested specifications.
REV. D
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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
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© Analog Devices, Inc., 1999