High Common-Mode Voltage
Programmable Gain Difference Amplifier
AD628
FUNCTIONAL BLOCK DIAGRAM
FEATURES
R
R
EXT1
EXT2
High common-mode input voltage range
120 V at VS = 1ꢀ V
Gain range 0.1 to 100
+V
S
R
G
Operating temperature range: −40°C to 8ꢀ°C
Supply voltage range
Dual supply: 2.2ꢀ V to 18 V
Single supply: 4.ꢀ V to 36 V
Excellent ac and dc performance
Offset temperature stability RTI: 10 µV/°C max
Offset: 1.ꢀ V mV max
100kΩ
10kΩ
–IN
+IN
G = +0.1
–IN
+IN
OUT
A2
–IN
10kΩ
A1
+IN
100kΩ
10kΩ
AD628
CMRR RTI: 7ꢀ dB min, dc to ꢀ00 Hz, G = +1
–V
V
S
REF
APPLICATIONS
C
FILT
High voltage current shunt sensing
Programmable logic controllers
Analog input front end signal conditioning
+ꢀ V, +10 V, ꢀ V, 10 V and 4 to 20 mA
Isolation
Figure 1.
130
120
110
100
90
Sensor signal conditioning
Power supply monitoring
Electrohydraulic control
Motor control
V
= ±15V
S
GENERAL DESCRIPTION
80
70
The AD628 is a precision difference amplifier that combines
excellent dc performance with high common-mode rejection
over a wide range of frequencies. When used to scale high
voltages, it allows simple conversion of standard control
voltages or currents for use with single-supply ADCs. A
wideband feedback loop minimizes distortion effects due to
capacitor charging of ∑-∆ ADCs.
V
= ±2.5V
S
60
50
40
30
10
100
1k
FREQUENCY (Hz)
10k
100k
Figure 2. CMRR vs. Frequency of the AD628
A reference pin (VREF) provides a dc offset for converting
bipolar to single-sided signals. The AD628 converts +5 V, +10 V,
5 V, 10 V, and 4 to 20 mA input signals to a single-ended
output within the input range of single-supply ADCs.
A precision 10 kΩ resistor connected to an external pin is
provided for either a low-pass filter or to attenuate large
differential input signals. A single capacitor implements a low-
pass filter. The AD628 operates from single and dual supplies and
is available in an 8-lead SOIC or MSOP package. It operates over
the standard industrial temperature range of −40°C to +85°C.
The AD628 has an input common-mode and differential
mode operating range of 120 V. The high common-mode
input impedance makes the device well suited for high voltage
measurements across a shunt resistor. The buffer amplifier’s
inverting input is available for making a remote Kelvin
connection.
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 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
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
www.analog.com
© 2004 Analog Devices, Inc. All rights reserved.
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