Part Number:ADS62P49
Offset Correction does not appear to work as stated in the datasheet for the ADC device ADS62P49. We are able to confirm that offset correction is enabled when setting bit 6 of reg 53 to 1. According to pg 64 of datasheet, After offset is determined, the correction can be frozen by setting bit back to 0. This does not appear to work and offset correction gets turned off. Other TI datasheets for other ADCs have a separate bit to freeze, the offset value. How do we freeze value for the ADS62P49 device?]
1) We are running in Common mode control for both channels of AADS62P49 (bit 6 of reg 50 set).
2) Set offset Correction Time Constant to 512M.
3) Enable offset correction by setting bit 6 of reg 53 to 1.
4) Monitor ADC values and confirmed that offset applied.
5) Wait and then set bit 6 of reg 53 back to 0.
6) See ADC values revert back to previous values before offset correction was enabled.