Here’s an app note form Analog Design describing the nine often overlooked parameters of analog to digital converters, and how they impact the design. The article goes over the resolution, power supply rejection (PSR), common-Mode rejection (CMR), the clock slew rate, aperture jitter, aperture delay, conversion time and conversion latency, wake up time, output loading, monotonicity, and the very important unspecified criteria of PCB layout.
Analog-to-digital converters (ADCs) have many specifications; some are more important for a given application than others. Understanding these specifications and controlling external devices affecting the ADC will lead to better performance.