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AMC1200 数据表(PDF) 14 Page - Texas Instruments |
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AMC1200 数据表(HTML) 14 Page - Texas Instruments |
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14 / 23 page ![]() G =G + ERRTOT ERR R 2 R IN R IN R 2 R 1 L1 L2 AMC1200 SBAS542A – APRIL 2011 – REVISED AUGUST 2011 www.ti.com 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 (R1 and R2 in Figure 34) is used to match the relatively small input voltage range of the AMC1200. R2 and the input resistance RIN of the AMC1200 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: Where GERR = the gain error of AMC1200. (1) Figure 34. Voltage Measurement Application 14 Copyright © 2011, Texas Instruments Incorporated |
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