DSD Counts to Voltage

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User16575
Level 1
Level 1
Hi,

Im using the the Delta sigma demodulator with an external DSD that has ±250-mV input range. I have the clock and dout connected to a DSD IC and I'm having trouble reading a full scale voltage.

Im injecting a 500mV Vpp , 1 Hz, 0V offset sine wave and the largest value I read is 220mV Volts.

My understanding of how to calculate volts:



CIC = 32. Filter = Sinc3


Meaning that Vout = dsd result * ( 0.250 / 2^15)

Meaning that at 250 mV I would have 32768 * (1.0 / 2^15)

Can I get confirmation that my understanding is correct of how to convert counts to a voltage reading ?
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Vasanth
Moderator
Moderator
Moderator
250 sign-ins 500 solutions authored First question asked
Hi,

Could you let us know how you are using the DSD ? Are you using the DS_ADC_DEMOD App ? Could you share the code snippet or configuration information? Additionally what external DSD are you using ?

Best Regards,
Vasanth
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