I am using the EVAL-AD4112SDZ to read three unipolar signals (0-5V) . I am communicating with the eval board via SPI with a microprocessor, rather than using an SDB board. I have verified my SPI comms are working correctly. I have set the registers to be the following:
ADCMODE 0x2000
IFMODE 0x0000
SETUP0 0x0030
FILTER0 0x0510
CH0 0x8010
CH1 0x8030
CH2 0x8050
When the channels are connected to VCOM I see ~ 0x042000, when channels are connected to VDD (5V) I see ~ 0x0B4000. This is the same as when I use the Eval board's 2.5V VREF (with LK1). I would expect to see 0x000000 and 0xFFFFFF respectively. I have tried to recalibrate and the values look the same. Is my configuration incorrect? Is there some voltage dividers on the eval board I am not accounting for?
Thank you
