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Original question:

ADS131M04: About programmable data rate

ADS131M04: How to reduce the impact of interference

Manu Chang
Intellectual 2150 points
Part Number: ADS131M04


Hi，

My Customer is using ADS131M04 to measure a current signal from 0-150A, they set up the sample resistance that the sample voltage reach 1.2V when a 240A current occurs.

However, during testing they find out that when a sudden current increases from 0A to about 120A the DSP/MCU will not able to read the accurate current at all.  it seems that it occurs a high frequency noise which above 240A here, but they are not able to test it through oscilloscope. When they try to have a bigger GND area in PCB to reduce the interference, it becomes better. but it still occurs sometimes. 

So could you provide some advice/solution to reduce the interference during the current sudden increase? or are there any other reason and solutions to avoid this scenario ?

Thanks!

Manu