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AD628AR-REEL

更新时间: 2024-11-22 22:24:19
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亚德诺 - ADI 放大器
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20页 247K
描述
High Common-Mode Voltage Programmable Gain Difference Amplifier

AD628AR-REEL 数据手册

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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  
100k  
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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