xuanmulidong
Newbie level 5
For a 1st sigma-delta adc, max input voltage is 3v, reference voltage is 0.75V. Cs is the sample cap, Cf for the reference feedback cap.
I found only when the relation below is true, the adc works normally:
Vin_max *Cs=Vref*Cf. That means Cs/Cf=1/4.
Can some one give me an explanation? It is a basic and pratical problem when a designer starts to build a sigma delta adc, but I found nothing about this in books.
Thanks very much!
I found only when the relation below is true, the adc works normally:
Vin_max *Cs=Vref*Cf. That means Cs/Cf=1/4.
Can some one give me an explanation? It is a basic and pratical problem when a designer starts to build a sigma delta adc, but I found nothing about this in books.
Thanks very much!
