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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
reference"
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
resolution.

 

 

Please orrect me if i a wrong in my
Understanding .

 

 

Thanks

 

 

Pranesh

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