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ADUM3190's output linearies change board by board

Category: Hardware
Product Number: ADUM3190

Hi,

We are using ADUM3190 isolated amplifier for High voltage sensing but we are facing non lienar outputs board by board.

Here is our schematic design and our output results.

Can you please review desing and give us feedback ?

BOARD_3 HIGH VOLTAGE BOARD_4 HIGH VOLTAGE
INPUT DIVIDE COMP EOUT DIVIDE COMP EOUT
0 0 0 0.036 0 0 0
10 0.030 0.058 0.090 0.030 0.058 0.044
20 0.060 0.119 0.149 0.060 0.118 0.105
30 0.090 0.179 0.209 0.090 0.178 0.167
40 0.120 0.240 0.269 0.121 0.238 0.228
50 0.151 0.300 0.330 0.151 0.299 0.290
60 0.181 0.360 0.390 0.181 0.359 0.352
70 0.211 0.420 0.451 0.211 0.419 0.414
80 0.241 0.485 0.512 0.241 0.480 0.476
90 0.272 0.541 0.572 0.271 0.540 0.537
100 0.302 0.602 0.633 0.302 0.600 0.600
110 0.332 0.662 0.694 0.332 0.661 0.661
120 0.362 0.722 0.755 0.362 0.721 0.724
130 0.392 0.783 0.816 0.392 0.781 0.785
140 0.423 0.843 0.877 0.422 0.842 0.848
150 0.453 0.904 0.937 0.453 0.902 0.910
160 0.483 0.964 0.999 0.483 0.963 0.972
170 0.513 1.025 1.059 0.513 1.023 1.035
180 0.543 1.085 1.120 0.543 1.083 1.096
190 0.574 1.145 1.181 0.573 1.144 1.158
200 0.604 1.206 1.242 0.603 1.204 1.220
210 0.634 1.266 1.302 0.634 1.265 1.283
220 0.664 1.327 1.363 0.664 1.325 1.345
230 0.694 1.387 1.424 0.694 1.385 1.406
240 0.724 1.448 1.485 0.725 1.446 1.469
250 0.755 1.508 1.546 0.755 1.506 1.530
260 0.786 1.569 1.607 0.785 1.567 1.593
270 0.816 1.629 1.668 0.815 1.627 1.654
275 0.831 1.660 1.698 0.831 1.658 1.686
280 0.846 1.690 1.728 0.846 1.688 1.716
290 0.876 1.750 1.789 0.876 1.748 1.779
300 0.908 1.811 1.850 0.907 1.809 1.840
310 0.937 1.872 1.911 0.937 1.869 1.903
320 1.067 1.932 1.972 0.967 1.930 1.965
330 1.097 1.993 2.032 0.997 1.990 2.026

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