High Common-Mode Voltage,
Programmable Gain Difference Amplifier
AD628
FUNCTIONAL BLOCK DIAGRAM
FEATURES
High common-mode input voltage range
±±12 V at VS = ±±ꢀ V
Gain range 2.± to ±22
R
R
EXT1
EXT2
+V
S
R
G
Operating temperature range: −42°C to ±ꢁꢀ°C
Supply voltage range
Dual supply: ±1.1ꢀ V to ±±ꢁ V
100kΩ
10kΩ
–IN
+IN
G = +0.1
–IN
+IN
OUT
A2
Single supply: 4.ꢀ V to 36 V
–IN
10kΩ
A1
Excellent ac and dc performance
Offset temperature stability RTI: ±2 μV/°C maximum
Offset: ±±.ꢀ V mV maximum
+IN
100kΩ
10kΩ
AD628
CMRR RTI: 7ꢀ dB minimum, dc to ꢀ22 Hz, G = +±
–V
V
S
REF
APPLICATIONS
C
FILT
High voltage current shunt sensing
Programmable logic controllers
Analog input front end signal conditioning
+ꢀ V, +±2 V, ±ꢀ V, ±±2 V, and 4 to 12 mA
Isolation
Sensor signal conditioning
Power supply monitoring
Electrohydraulic control
Figure 1.
130
120
110
100
90
V
= ±15V
S
Motor control
80
GENERAL DESCRIPTION
70
V
= ±2.5V
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 Σ-Δ ADCs.
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_N or 8-lead 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 inverting input of the
buffer amplifier is available for making a remote Kelvin
connection.
Rev. F
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 9±26, Norwood, MA 21261-9±26, U.S.A.
Tel: 7ꢁ±.319.4722
Fax: 7ꢁ±.46±.3±±3
www.analog.com
©1226 Analog Devices, Inc. All rights reserved.
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