I am using AD7685 to read a CMOS linear camera sensors. The sensor has 512 pixels. It reads 512 consecutively at 125Khz, wait some time, then read it again.
The first few AD readings, for some reasons, are always off a little bit. The first reading has the most error in it. I wonder if it is issue with the AD7685, where there is sampling issues with the first few pixels due to the sudden signal level change. So checked the track time, it has more than 1.8us that the spec says.
I looked the sensor output, I don't see the discrepancies for the first few pixels, they are all pretty smooth.
I wonder if there is sleep low power mode before you start the first conversion. Takes long time for the chip to get out of the sleep mode.
Added a tag for internal tracking purposes.
[edited by: tschmitt at 7:11 PM (GMT -4) on 23 Sep 2020]