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PCM1773: Input digital code vs Output analog voltage

Kuramochi Tadahiko
Guru 28715 points

Part Number: PCM1773

Hi,

Ideally, is relationship of input digital code and output analog voltage linear as below?

If not, could you tell me ideal relationship of input digital code and output analog voltage?

Best Regards,

Kuramochi

  • 0
    TI__Guru 56153 points

    Hi Kuramochi-san,

    Generally, TI does not specify the linearity for the audio DACs.  These DACs are generally design for AC performance, and usually have an DC blocking capacitor.  Non-linearity error would impact THD+N, so to an extent it is represented in that specification.  The data format for this DAC is a signed (2s complement) 24 bit number.  Negative full scale code (0x800000) would be ~(-0.77*VCC/2 + 0.5*VCC), zero scale (0x000000) would be 0.5*VCC, and full scale (0x7FFFFF) would be ~(0.77*VCC/2 + 0.5*VCC)

    Thanks!

    Paul