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PCM1753-Q1: Filter between PCM5173-Q1 and class D amplifier

domenyko
Genius 9655 points
Part Number: PCM1753-Q1
Other Parts Discussed in Thread: TAS5411-Q1

Dear all,

one of my AA is going to use the PCM1753-Q1 followed by TAS5411-Q1 (mono application).

Is it possible to configure the Left and right channel of the PCM1753-Q1 as a differential output in order to drive the TAS5411-Q1 ?

Which filter do you suggest between the PCM5173-Q1 and the class D amplifier ? The PCM5173-Q1 has already a low pass filter but it could be not enogh to cut out-band noise intoduced by the sigma delta.

thanks,

Domenico

  • 0
    TI__Guru 53433 points

    Hi Dominico,

    The PCM1753-Q1 does not support the differential output mode, thought I suppose it could be possible for this to be implemented be digitally if the system has a DSP or MCU.

    At the very minimum there should be an external RC filter, but better OoB noise performance can be achieved with a higher order active filter.  Figure 29 in the PDS shows an example of this filter.

    Thanks!

    Paul

  • 0 in reply to Paul_Frost
    TI__Genius 9655 points
    Dear Paul,

    thanks for the suggestions.

    The customer is going to implement the differential output in digital way.

    Since the customer has provided me schematic and bom for review, can I sent them to you by email?

    regards,

    Domenico