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AD628 Datasheet

High Common-Mode Voltage Programmable Gain Difference Amplifier

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AD628 pdf
High Common-Mode Voltage,
Programmable Gain Difference Amplifier
AD628
FEATURES
High common-mode input voltage range
±120 V at VS = ±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-Δ ADCs.
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.
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
REXT2
REXT1
+VS
7
6 RG
100k
–IN 8
100k
+IN 1
10k
G = +0.1
–IN
A1
+IN
10k
2
–VS
3
VREF
10k
4
CFILT
–IN
A2
+IN
OUT
5
AD628
Figure 1.
130
120
110
100
90
80
70
60
50
40
30
10
VS = ±15V
VS = ±2.5V
100 1k 10k
FREQUENCY (Hz)
Figure 2. CMRR vs. Frequency of the AD628
100k
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.
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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.


Analog Devices Semiconductor Electronic Components Datasheet

AD628 Datasheet

High Common-Mode Voltage Programmable Gain Difference Amplifier

No Preview Available !

AD628 pdf
AD628
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
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
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
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
Rev. G | Page 2 of 20


Part Number AD628
Description High Common-Mode Voltage Programmable Gain Difference Amplifier
Maker Analog Devices
Total Page 20 Pages
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