AMC1200
SBAS542 –APRIL 2011
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VOLTAGE MEASUREMENT
The AMC1200 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 (R
1
and R
2
in Figure 34) is used to match the relatively
small input voltage range of the AMC1200. R
2
and the input resistance R
IN
of the AMC1200 also create a
resistance divider that results in additional gain error. With the assumption that R
1
and R
IN
have a considerably
higher value than R
2
, the resulting total gain error can be estimated using Equation 1:
Where G
ERR
= the gain error of AMC1200.
(1)
Figure 34. Voltage Measurement Application
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