AD526AD ,Software Programmable Gain AmplifierSpecifications subject to change without notice.
AD526AD ,Software Programmable Gain AmplifierFEATURES PIN CONFIGURATIONDigitally Programmable Binary Gains from 1 to 16Two-Chip Cascade Mode Ach ..
AD526BD ,Software Programmable Gain AmplifierSpecifications shown in boldface are tested on all production units at final electrical test. All m ..
AD526CD ,Software Programmable Gain Amplifierapplications requiring programmable Additional gains of 32, 64, 128 and 256 are possible by cas-gai ..
AD526JN ,Software Programmable Gain Amplifierspecifications.+125
AD526AD-AD526BD-AD526CD-AD526JN-AD526SD
Software Programmable Gain Amplifier
REV.D
Software Programmable
Gain Amplifier
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/8C Drift Over Temperature
Fast Settling Time
10 V Signal Change:
0.01% in 4.5 ms (Gain = 16)
Gain Change:
0.01% in 5.6 ms (Gain = 16)
Low Nonlinearity: 60.005% FSR Max (J Grade)
Excellent DC Accuracy:
Offset Voltage: 0.5 mV Max (C Grade)
Offset Voltage Drift: 3 mV/8C (C Grade)
TTL-Compatible Digital Inputs
PRODUCT DESCRIPTIONThe 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.
PIN CONFIGURATION
DIG GNDA1
NULLA0
VINCS
NULLCLK
ANALOG GND 2A2
ANALOG GND 1B
–VS+VS
VOUT SENSEVOUT FORCE
ORDERING GUIDE*Refer to official DESC drawing for tested specifications.
APPLICATION HIGHLIGHTSDynamic Range Extension for ADC Systems: A singleAD526 in conjunction with a 12-bit ADC can provide
96 dB of dynamic range for ADC systems.
Gain Ranging Preamps: The AD526 offers complete digitalgain 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.
AD526–SPECIFICATIONS(@ VS = 615 V, RL = 2 kV and TA = +258C unless otherwise noted)
AD526DYNAMIC RESPONSE
DIGITAL INPUTS
TIMING
TEMPERATURE RANGE
PACKAGE OPTIONS
NOTESRefer 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
AD526–Typical Performance Characteristics
SUPPLY VOLTAGE – 6V
OUTPUT VOLTAGE SWING – 05201015Figure 1.Output Voltage Swing vs.
Supply Voltage, G = 16
TEMPERATURE – 8C
INPUT BIAS CURRENT
100nA
10nA
1pA–60–201402060100
1nA
100pA
10pA Figure 4.Input Bias Current vs.
Temperature
FREQUENCY – Hz
FULL POWER RESPONSE – V p-p
10k100k1M10MFigure 7.Large Signal Frequency
Response
LOAD RESISTANCE – V
OUTPUT VOLTAGE SWING –
1001k10kFigure 2.Output Voltage Swing vs.
Load Resistance
INPUT VOLTAGE – V
INPUT BIAS CURRENT – pA
–10–50510Figure 5.Input Bias Current vs. Input
Voltage
FREQUENCY – Hz
POWER SUPPLY REJECTION – dB
1001001k10k100k1MFigure 8.PSRR vs. Frequency
SUPPLY VOLTAGE – 6V
INPUT BIAS CURRENT – pA05201015 Figure 3.Input Bias Current vs.
Supply Voltage
FREQUENCY – Hz
GAIN10010M10k100k1MFigure 6.Gain vs. Frequency
TEMPERATURE – 8C
NORMALIZED GAIN
0.9998–202060100140 Figure 9.Normalized Gain vs.
Temperature, Gain = 1
FREQUENCY – Hz
INPUT NOISE VOLTAGE – nV/ Hz100k1001k10kFigure 10.Noise Spectral Density
Figure 13.Large Signal Pulse
Response and Settling Time,*
G = 1
Figure 16.Small Signal Pulse
Response, G = 2
TEMPERATURE – 8C
NONLINEARITY – %FSR
–0.004–202060100140Figure 11.Nonlinearity vs.
Temperature, Gain = 1
Figure 14.Small Signal Pulse
Response, G = 1
Figure 17.Large Signal Pulse
Response and Settling Time,*
G = 4
Figure 12.Wideband Output Noise,
G = 16 (Amplified by 10)
Figure 15.Large Signal Pulse
Response and Settling Time,*
G = 2
Figure 18.Small Signal Pulse
Response, G = 4
AD526 Figure 19.Large Signal Pulse
Response and Settling Time,* G = 8
Figure 22.Small Signal Pulse
Response, Gain = 16
FREQUENCY – Hz
OUTPUT IMPEDANCE –
10k10M
100k1M Figure 25.Output Impedance vs.
Frequency
Figure 20.Small Signal Pulse
Response, G = 8
FREQUENCY – Hz
TOTAL HARMONIC DISTORTION – dB
1001k10k100kFigure 23.Total Harmonic Distortion
vs. Frequency Gain = 16
Figure 26.Gain Change Settling
Time,** Gain Change: 1 to 2
Figure 21.Large Signal Pulse
Response and Settling Time,* G = 16
FREQUENCY – Hz
PHASE DISTORTION – Dedrees
1001k10k100k Figure 24.Phase Distortion vs.
Frequency, Gain = 16
Figure 27.Gain Change Settling
Time,** Gain Change 1 to 4
Figure 28.Gain Change Settling
Time,* Gain Change 1 to 8
Figure 29.Gain Change Settling
Time,* Gain Change 1 to 16
SHIELD
Vo = 160 3 e p-p
NOTE: COAX CABLE 1 FT. OR LESSFigure 30.Wideband Noise Test Circuit
+15V–15V
+15V–15V
+15V–15V
VERROR
IN6263
1pFFigure 31.Settling Time Test Circuit
