I'm currently working on a project involving the AD7779.
Channels 0-3 are used, 4-7 are disabled through CH_DISABLE register.
I'm using an external 2.5v Reference.
ODR is set to 0.5ksps
PGA Gain is set to 8 for every used channel, and the power mode is set to Hi-Resolution.
In the initialization sequence, I'm performing the offset adjustment then the gain adjustment using the internal 280mV differential signal. Note that a digital reset is performed as per datasheet requests.
However, I see that this signal seems quite unstable, varying typically +/- 450 MSBs:
I couldn't find any clue about it's specifications / limitations.
Is this behavior expected for the 280mV p-p signal ?
Thank you very much!