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PCM2904: ADC input range and DAC output range

Michael LM
Prodigy 240 points
Part Number: PCM2904

Dear fellow developers,

I am currently designing a system which includes the PCM2904. In order to optimally utilize the ADC range and to optimize DAC output gain, I would need the conversation limits of the devices analog I/Os. The datasheet states:

Analog Input:

Input Voltage 0.6*Vccci

Center Voltage 0.5*Vcci

Analog Output:

Output Voltage 0.6*Vccci

Center Voltage 0.5*Vcci

Can I therefore conclude that the ADC/DAC top value in 16-Bit Mode for Vccci=3.3V corresponds to 1.98V and lowest value corresponds to 1.32V? Thus any voltage at the ADC input beyond there values would result in ADC clipping and the maximum peak-to-peak amplitude with respekt to Vccci/2 convertable would be 0.66V?

Kind reagards

  • 0
    TI__Guru 57800 points

    Hi, Michael,

    The analog signal levels specifications from the datasheet of the PCM2904 meant that the maximum peak to peak amplitude of the analog signal at full-scale is 0.6×Vccci (1.98Vpp), this signal is mounted on a DC bias voltage of 0.5×Vccci (1.65V). So, the maximum analog voltage of the analog signal without saturation  would be 2.64V and the minimum value 0.66. Please refer to below image as reference (Vccci=3.3V):


    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    Prodigy 240 points
    Dear Diego,

    thank you for clarifying.

    Kind regrads