I'm using LTC2263-14 14 bit pipeline ADC in my application. However, I'm completely confused regarding the input voltage range, reference voltage etc. It has a differential input with an internally generated voltage reference of 1.25V and the ADC generate a common mode voltage of VDD/2 which is 0.9V in my case. As far as I know, I'll should be able to digitize a differential voltage upto 1.25V, right?
From the table it seems that when the differential input is 1V or -1V, the ADC hits its limit(2^14-1, 0 respectively). So what's the point of a 1.25V voltage reference if I can only measure up to 1V differential. From my understanding, the ADC should give a full scale reading if the differential input is 1.25V. Also I'm actually using single ended input (grounding AIN- and feeding the signal at AIN+). I'm using 2V input range and from page 18, it says:
From the above info, VCM-0.5V and VCM+0.5V, it doesn't seem to provide 2V range. Can someone clarify the above doubts?
Is it okay to drive the ADC with a single ended input, ignoring noise issues etc., and then do adjustments in software as necessary?