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AD628ARZ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
High Common-Mode Voltage,
Programmable Gain Difference Amplifier
AD628
Rev. G
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 www.analog.com
Fax: 781.461.3113 ©2002–2007 Analog Devices, Inc. All rights reserved.
FEATURES
High common-mode input voltage range
±120 V at V
S
= ±15 V
Gain range 0.1 to 100
Operating temperature range: −40°C to +85°C
Supply voltage range
Dual supply: ±2.25 V to ±18 V
Single supply: 4.5 V to 36 V
Excellent ac and dc performance
Offset temperature stability RTI: 10 μV/°C maximum
Offset: ±1.5 V mV maximum
CMRR RTI: 75 dB minimum, dc to 500 Hz, G = +1
APPLICATIONS
High voltage current shunt sensing
Programmable logic controllers
Analog input front end signal conditioning
+5 V, +10 V, ±5 V, ±10 V, and 4 to 20 mA
Isolation
Sensor signal conditioning
Power supply monitoring
Electrohydraulic controls
Motor controls
GENERAL DESCRIPTION
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- ADCs.
A reference pin (V
REF
) 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.
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.
FUNCTIONAL BLOCK DIAGRAM
+IN
–IN
+IN
–IN
–V
S
V
REF
R
EXT1
R
G
+V
S
R
EXT2
C
FILT
A2
A1
+IN
–IN
100k
100k
10k
10k
10k
AD628
OUT
G = +0.1
8
1
2 3 4
5
67
0
2992-001
Figure 1.
30
40
50
60
70
80
90
100
110
120
130
CMRR (dB)
FREQUENCY (Hz)
10010 1k 10k 100k
02992-002
V
S
= ±2.5V
V
S
= ±15V
Figure 2. CMRR vs. Frequency of the AD628
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 an 8-lead MSOP. It
operates over the standard industrial temperature range of
−40°C to +85°C.
AD628* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
View a parametric search of comparable parts.
DOCUMENTATION
Application Notes
• AN-244: A User's Guide to I.C. Instrumentation Amplifiers
• AN-245: Instrumentation Amplifiers Solve Unusual Design
Problems
• AN-282: Fundamentals of Sampled Data Systems
• AN-589: Ways to Optimize the Performance of a
Difference Amplifier
• AN-669: Effectively Applying the AD628 Precision Gain
Block
• AN-671: Reducing RFI Rectification Errors in In-Amp
Circuits
Data Sheet
• AD628: High Common-Mode Voltage, Programmable
Gain Difference Amplifier Data Sheet
Technical Books
• A Designer's Guide to Instrumentation Amplifiers, 3rd
Edition, 2006
TOOLS AND SIMULATIONS
• AD628 SPICE Macro Model
REFERENCE DESIGNS
• CN0190
REFERENCE MATERIALS
Technical Articles
• Auto-Zero Amplifiers
• High-performance Adder Uses Instrumentation Amplifiers
• Input Filter Prevents Instrumentation-amp RF-
Rectification Errors
• MS-2405: Simple Circuit Measures the RMS Value of an AC
Power Line
• Simple circuit provides precision ADC interface
• Single IC provides gains of 10 and –10
• The AD8221 - Setting a New Industry Standard for
Instrumentation Amplifiers
DESIGN RESOURCES
• AD628 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
DISCUSSIONS
View all AD628 EngineerZone Discussions.
SAMPLE AND BUY
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TECHNICAL SUPPORT
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number.
DOCUMENT FEEDBACK
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AD628
Rev. G | Page 2 of 20
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 7
Thermal Characteristics .............................................................. 7
ESD Caution.................................................................................. 7
Pin Configuration and Function Descriptions............................. 8
Typical Performance Characteristics ............................................. 9
Test Circuits ..................................................................................... 13
Theory of Operation ...................................................................... 15
Applications Information.............................................................. 16
Gain Adjustment ........................................................................ 16
Input Voltage Range................................................................... 16
Voltage Level Conversion.......................................................... 17
Current Loop Receiver .............................................................. 18
Monitoring Battery Voltages..................................................... 18
Filter Capacitor Values............................................................... 19
Kelvin Connection ..................................................................... 19
Outline Dimensions ....................................................................... 20
Ordering Guide .......................................................................... 20
REVISION HISTORY
4/07—Rev. F to Rev. G
Changes to Features.......................................................................... 1
Changes to Figure 22...................................................................... 11
Changes to Figure 25...................................................................... 13
Changes to Voltage Level Conversion Section............................ 17
Changes to Monitoring Battery Voltages Section ...................... 18
Changes to Figure 34...................................................................... 18
Changes to Figure 35...................................................................... 19
Updated Outline Dimensions....................................................... 20
3/06—Rev. E to Rev. F
Changes to Table 1............................................................................ 3
Changes to Figure 3.......................................................................... 7
Replaced Voltage Level Conversion Section ............................... 16
Changes to Figure 32 and Figure 33............................................. 17
Updated Outline Dimensions....................................................... 19
Changes to Ordering Guide .......................................................... 19
5/05—Rev. D to Rev. E
Changes to Table 1........................................................................... 3
Changes to Table 2........................................................................... 5
Changes to Figure 33.....................................................................18
3/05—Rev. C to Rev. D
Updated Format................................................................ Universal
Changes to Table 1........................................................................... 3
Changes to Table 2........................................................................... 5
4/04—Rev. B to Rev. C
Updated Format................................................................ Universal
Changes to Specifications............................................................... 3
Changes to Absolute Maximum Ratings...................................... 7
Changes to Figure 3......................................................................... 7
Changes to Figure 26..................................................................... 13
Changes to Figure 27..................................................................... 13
Changes to Theory of Operation................................................. 14
Changes to Figure 29..................................................................... 14
Changes to Table 5......................................................................... 15
Changes to Gain Adjustment Section.........................................15
Added the Input Voltage Range Section..................................... 15
Added Figure 30 ............................................................................ 15
Added Figure 31 ............................................................................ 15
Changes to Voltage Level Conversion Section ..........................16
Changes to Figure 32..................................................................... 16
Changes to Table 6......................................................................... 16
Changes to Figure 33 and Figure 34............................................ 17
Changes to Figure 35..................................................................... 18
Changes to Kelvin Connection Section...................................... 18
6/03—Rev. A to Rev. B
Changes to General Description ................................................... 1
Changes to Specifications............................................................... 2
Changes to Ordering Guide ........................................................... 4
Changes to TPCs 4, 5, and 6 .......................................................... 5
Changes to TPC 9............................................................................ 6
Updated Outline Dimensions...................................................... 14
1/03—Rev. 0 to Rev. A
Change to Ordering Guide............................................................. 4
11/02—Rev. 0: Initial Version
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21

AD628ARZ

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Manufacturer:
Analog Devices Inc.
Description:
Differential Amplifiers Hi CM Vltg Gain Prog
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