Question about mdac settling time in pipeline ADC

[ljy4468]

hi everybody?
I've question about mdac settling time in pipeline adc

Assume, Clock speed is 80Mhz,
(half of the T : 6.25ns)

Then, my mdac settles in about 6.25ns???
Or 4 or 5ns????

Thanks in advance.

 

[willyboy19]

Re: mdac settling time

You need to understand and clearly define what is the real meaning of 'settle': it is the accuracy that the MDAC needs to achieve, which depends on the overall accuracy of the pipeline ADC, if the MDAC is the first stage of such a pipeline.

A normal way to specify this is to settle within N-bit accuracy over half of your clock rate (slightly less than half due to non-overlap overhead).