AnsweredAssumed Answered

ad7401 discussion

Question asked by madetipranesh on Jul 1, 2014
Latest reply on Jul 28, 2014 by JohnnyG

Hi Dave,



I have a questionfor you. Could you pleas help out .



I was just going through the AD7401A data sheet. And trying to implement the
second order delta modulator. From the Page 14 of the AD7401A data sheet theere
is a statement saying that "



The analog input signal is continuously sampled by the modulator and
compared to an internal voltage reference. "

I would like to know what is the "internal voltage
for this device. Could you please help me out in this.


From the page 13 in the terminology section there is a statement "(VIN+ − VIN−), Code 7169
for the 16-bit level, and specified positive full scale, +250 mV (V
IN+ − VIN−), Code 58366
for the 16-bit level..



I would like to knbow how this number
"7169" has been arrived. I would like to know the formulae.



I assume that 1lsb = Vref/2^N. N = adc bit



Please orrect me if i a wrong in my
Understanding .