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AD-FMCOMMS1-EBZ  No OS Ref Design - ADC Output?

Question asked by DrTom on Mar 8, 2013
Latest reply on Jan 20, 2015 by notme

I am a little confused about the output format of the ADC. According to the data sheet it is 2's complement 14-bit (page27 of AD9643 data sheet) but if you look at the code in the ref designs function adc_test() it masks off the lower and upper channels with masks of 0x0000FFFF and 0xFFFF0000(with a 16 bit right shift). I also ran the ADC in test mode = 0xF (ramp) and looked at the values, and these masks do produce incrementing ramps on both channels. Can anyone explain this?