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| AMC1100 Datasheet, PDF (14/22 Pages) Texas Instruments – Fully-Differential Isolation Amplifier for Energy Metering | |||
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AMC1100
SBAS562 â APRIL 2012
www.ti.com
VOLTAGE MEASUREMENT
The AMC1100 can also be used for isolated voltage measurement applications, as shown in a simplified way in
Figure 34. In such applications, usually a resistor divider (R1 and R2 in Figure 34) is used to match the relatively
small input voltage range of the AMC1100. R2 and the AMC1100 input resistance (RIN) also create a resistance
divider that results in additional gain error. With the assumption that R1 and RIN have a considerably higher value
than R2, the resulting total gain error can be estimated using Equation 1:
GERRTOT
=
GERR
+
R2
RIN
Where GERR = device gain error.
(1)
L1
R1
R2
RIN
L2
Figure 34. Voltage Measurement Application
14
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Copyright © 2012, Texas Instruments Incorporated
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