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ad7401 discussion

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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  • Hi Johnny ,

    Thxs a lot.  I am tring to develop a simple Bus functional model for AD7401A in order to test my design . I have few silly doubts could you please clarify me .

    From the Page 1 of AD7401A data sheet there is a functional block diagram.

    When going through the block digaram i have noticed there is  sigma delta modulation , control Logic . etc

    I have understood what is the behviour of the sigma delta modulation i detail . But not the control logic.

    1.  could you please tel me short brief descripton on the Control Logic block if possible.

    2. Can i test My design just by developing the Bus functional Model for A7401A using the Sigma Delta modulator 

        only ?

    Thanks Regards,

    M.Pranesh

Reply
  • Hi Johnny ,

    Thxs a lot.  I am tring to develop a simple Bus functional model for AD7401A in order to test my design . I have few silly doubts could you please clarify me .

    From the Page 1 of AD7401A data sheet there is a functional block diagram.

    When going through the block digaram i have noticed there is  sigma delta modulation , control Logic . etc

    I have understood what is the behviour of the sigma delta modulation i detail . But not the control logic.

    1.  could you please tel me short brief descripton on the Control Logic block if possible.

    2. Can i test My design just by developing the Bus functional Model for A7401A using the Sigma Delta modulator 

        only ?

    Thanks Regards,

    M.Pranesh

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