High Common-Mode Voltage,
Difference Amplifier
AD629
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Improved replacement for: INA117P and INA117KU
±270 V common-mode voltage range
Input protection to
±±00 V common mode
±±00 V differential mode
21.1kΩ
380kΩ
380kΩ
380kΩ
8
7
6
5
NC
+V
1
2
3
4
REF(–)
–IN
S
+IN
OUTPUT
REF(+)
20kΩ
–V
S
Wide power supply range (±2.± V to ±18 V)
±10 V output swing on ±12 V supply
1 mA maximum power supply current
AD629
NC = NO CONNECT
Figure 1.
GENERAL DESCRIPTION
HIGH ACCURACY DC PERFORMANCE
3 ppm maximum gain nonlinearity (AD629B)
20 μV/°C maximum offset drift (AD629A)
10 μV/°C maximum offset drift (AD629B)
10 ppm/°C maximum gain drift
The AD629 is a difference amplifier with a very high input,
common-mode voltage range. It is a precision device that allows
the user to accurately measure differential signals in the
presence of high common-mode voltages up to ±2ꢀ7 ꢁ.
The AD629 can replace costly isolation amplifiers in
applications that do not require galvanic isolation. The device
operates over a ±2ꢀ7 ꢁ common-mode voltage range and has
inputs that are protected from common-mode or differential
mode transients up to ±±77 ꢁ.
EXCELLENT AC SPECIFICATIONS
77 dB minimum CMRR @ ±00 Hz (AD629A)
86 dB minimum CMRR @ ±00 Hz (AD629B)
±00 kHz bandwidth
The AD629 has low offset, low offset drift, low gain error drift,
low common-mode rejection drift, and excellent CMRR over a
wide frequency range.
APPLICATIONS
High voltage current sensing
Battery cell voltage monitors
Power supply current monitors
Motor controls
The AD629 is available in low cost, 8-lead PDIP and 8-lead
SOIC packages. For all packages and grades, performance is
guaranteed over the industrial temperature range of −47°C to
+8±°C.
Isolation
100
95
90
85
80
75
70
65
60
55
50
2mV/DIV
60V/DIV
–240
–120
0
120
240
20
100
1k
10k 20k
COMMON-MODE VOLTAGE (V)
FREQUENCY (Hz)
Figure 3. Error Voltage vs. Input Common-Mode Voltage
Figure 2. Common-Mode Rejection Ratio vs. Frequency
Rev. B
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 that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©1999-2007 Analog Devices, Inc. All rights reserved.
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