AMC1200BDUBR Datasheet, PDF (14/24 Pages) Texas Instruments – Fully-Differential Isolation Amplifier

AMC1200
AMC1200B
SBAS542B – APRIL 2011 – REVISED AUGUST 2012
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 (R₁ and R₂ in Figure 34) is used to
match the relatively small input voltage range of the AMC device. R₂ and the input resistance R_IN of the
AMC1200 also create a resistance divider that results in additional gain error. With the assumption that R₁ and
R_IN have a considerably higher value than R₂, the resulting total gain error can be estimated using Equation 1:
G_ERRTOT
=
G_ERR
+
R₂
R_IN
Where G_ERR = the gain error of AMC device.
(1)
L1
R₁
R₂
R_IN
L2
Figure 34. Voltage Measurement Application
14
Submit Documentation Feedback
Copyright © 2011–2012, Texas Instruments Incorporated
Product Folder Links: AMC1200 AMC1200B