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Dea rSir,
We are evaluating AMC1100DWVR and request your support to improve the linear measurable range.
Currently we are getting the below accuracies.
Voltage Range |
Accuracy |
100 - 200 |
+/-1 |
200 - 300 |
-5 |
300 - 600 |
-15 |
600 - 800 |
-30 |
Regards,
Muthu S
Hi Muthu,
in your table the units are missing.
Can you show a schematic of your AMC1100 circuit?
Kai
Hi Smith,
Not yet. Awaiting for end customer schematic file for review.
Regards,
Muthu S
Hi Muthu,
The input impedance of the AMC1100 is relatively low for voltage sensing applications.
There are two things that can be done to improve the accuracy. A calibration can be performed, or the resistors in the voltage divider circuit can be scaled down.
For clarification, please see 5. from the design steps section of this paper: http://www.ti.com/lit/an/sbaa321/sbaa321.pdf
Hi Kai,
Input Voltage across VDC+ and VDC- is measured and compared with the voltage across RA0 and RA1 multiplied by gain.
No additional circuitry or differential amplifier is used at the output of AMC1100.
Regards,
Muthu S