ADS131M08: Eliminate the input referred offset error by self-calibration

LIU QINGFENG

Part Number: ADS131M08

Hi, Expertor:

If MUXn[1:0] bits in the CHn_CFG to short the input of a certain channel, every 10ms, can the offset error can completely calbrated ?

3 months ago

0 Dale Li 3 months ago

TI__Mastermind 49515 points

Hi LIU QINGFENG,

The offset error can be reduced or minimized in global-chop mode, but it can not be 'completely' calibrated out.

BR,

Dale

0 LIU QINGFENG 3 months ago in reply to Dale Li

Prodigy 100 points

Dale:

thanks, but will it be better than global-chop mode? will the offset error reduced to less than 1uV?

the signal I am measuring is less than 1Hz, so wonder whether "zero-drift" can be built by this on-board self-calibration……

0 Dale Li 3 months ago in reply to LIU QINGFENG

TI__Mastermind 49515 points

Hi LIU QINGFENG,

Global-chop mode can reduce or minimize the offset error and noise than normal operation mode. I do not think you can reduce it less than 1uV, and also you need to confider noise.

BR,

Dale

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ADS131M08: Eliminate the input referred offset error by self-calibration