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AD628ARN

更新时间: 2024-11-02 23:27:19
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Amplifier. Other

AD628ARN 数据手册

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High Common-Mode Voltage  
Programmable Gain Difference Amplifier  
AD628  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
High Common-Mode InputVoltage Range  
120V atVS = 1V  
R
R
EXT1  
EXT2  
Gain Range +0.01 to +100  
OperatingTemperature Range  
–40ºC to +8ꢀºC  
+V  
S
R
G
SupplyVoltage Range  
Dual Supply: 2.2V to 18V  
Single Supply: +4.V to +36V  
Excellent AC and DC Performance  
OffsetTemperature Stability RTI  
10 V/ºC Max  
100k  
10kꢁ  
–IN  
+IN  
AD628  
G = +0.1  
–IN  
+IN  
OUT  
A2  
–IN  
10kꢁ  
A1  
+IN  
100kꢁ  
Offset  
10kꢁ  
1.V mV Max  
CMRR RTI  
7ꢀ dB Min, DC to ꢀ00 Hz, G = 1  
–V  
V
S
REF  
C
FILT  
APPLICATIONS  
HighVoltage Current Shunt Sensing  
Programmable Logic Controllers  
Analog Input Front End Signal Conditioning:  
+V, +10V, V, 10V and 4 to 20 mA  
Isolation  
Sensor Signal Conditioning  
Power Supply Monitoring  
Electro-Hydraulic Control  
Motor Control  
130  
120  
110  
100  
V
= ؎15V  
S
90  
80  
70  
V
= ؎2.5V  
S
60  
50  
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 A/D converters. A wideband feedback  
loop minimizes distortion effects due to capacitor charging of  
sigma-delta A/D converters.  
40  
30  
10  
100  
1k  
FREQUENCY – Hz  
10k  
100k  
Figure 1. CMRR vs. Frequency of the AD628  
A reference pin (VREF) provides a dc offset for converting bipo-  
lar to single-sided signals.The AD628 converts +5 V, +10 V,  
5 V, and 10 V and 4 to 20 mA input signals to a single-ended  
output within the input range of single-supply A/D converters.  
A precision 10 kresistor connected to an external pin is pro-  
vided for either a low-pass filter or to attenuate large differential  
input signals. A single capacitor implements a low-pass filter.  
The AD628 has an input common-mode and differential mode  
operating range of 120V. The high common-mode input  
impedance makes the device well suited for high voltage measure-  
ments across a shunt resistor.The buffer amplifier inverting input  
is available for making a remote Kelvin connection.  
The AD628 operates from single- and dual-supplies and is  
available in an 8-lead SOIC package. Contact the factory for  
availability in MSOP package. It operates over the standard  
industrial temperature range of –40ºC to +85ºC.  
REV.0  
Information furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assumed byAnalog Devices for its  
use, nor for any infringements of patents or other rights of third parties  
that may result from its use. No license is granted by implication or oth-  
erwise under any patent or patent rights of Analog Devices.Trademarks  
andregisteredtrademarksarethepropertyoftheirrespectivecompanies.  
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  
© 2002 Analog Devices, Inc. All rights reserved.  

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