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AMC3306M25: digital output code correspoding to the input voltage

Noriyuki Takahashi
Genius 9780 points
Part Number: AMC3306M25

Hi team,

According to the datasheet, 7.3.4 Digital Output, it seems that the digital output code correspoding to the input voltage can follow as below. Is this undertanding correct?

When the differential input is +250mV, digital output code will be 58368.

When the differential input is -250mV, digital output code will be 7168.

So this means that the peak-to-peak voltage is  -250mV to +250mV and the code of the peak-to-peak voltage is 58368 - 7168 = 51200.

This means the amplitude is +250mV, the code range of amplitude is 51200/2 = 25600.

Therefore, when the differentail input is +150mV, digital output code will be 25600*150mV/250mV = about 15360.

Regards,

Noriyuki Takahashi

  • +1
    TI__Guru**** 171496 points

    Hi Takahashi-san,

    Please do keep in mind that there is no 'output code' without using a digital filter on the bit-stream that comes from the AMC3306.  You need to offset your calculation by the mid-scale code, which would be 32768.  Your +150mV input would be around code 48126 after going through a sync3 filter with an OSR of 256.