Datasheet

R
IN
R
2
R
1
L1
L2
G =G +
ERRTOT ERR
R
2
R
IN
AMC1200
AMC1200B
SBAS542C –APRIL 2011–REVISED SEPTEMBER 2013 www.ti.com
VOLTAGE MEASUREMENT
The AMC1200 and AMC1200B 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 AMC device. 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 AMC device.
(1)
Figure 34. Voltage Measurement Application
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