I want to digitise a sweep signal. The frequency range is 1-100 Hz and the sweep time is 2 seconds. The amplitude is 4.08 Volts and an offset of 2.04 volts is added. ADC range = 0-4.04 Volts. I am currently using an SAR ADC and it is working fine. Would it be better to use a Delta-Sigma ADC? I need a fast and low power ADC. I can have a resolution up to 12-bits with the SAR and I don't think I need more than that. So the ADC resolution is not an issue.
Thank you!
Best Answer
For your application, either should work fine, but generally, an SAR ADC can run with much less power consumption than an Delta-Sigma, and most common SAR converters enter an almost zero power state unless the input changes. Under 2 or 3 MHz, I probably wouldn't even think of going with a Delta-Sigma converter. SAR's also need less signal conditioning on the front end generally.