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| AMC1200STDUBRQ1 Datasheet, PDF (15/23 Pages) Texas Instruments – Fully Differential Isolation Amplifier | |||
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AMC1200-Q1
www.ti.com
SBAS585 â SEPTEMBER 2012
VOLTAGE MEASUREMENT
The AMC1200-Q1 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 AMC1200-Q1. R2 and the input resistance RIN of the AMC1200-Q1
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 = the gain error of the AMC1200-Q1.
(1)
L1
R1
R2
RIN
L2
Figure 34. Voltage Measurement Application
Copyright © 2012, Texas Instruments Incorporated
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