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TAS5825MEVM: DRC and FSMODE

Mario Michel
Prodigy 40 points
Part Number: TAS5825MEVM
Other Parts Discussed in Thread: TAS5825M

Dear TI Team, 

I have questions about understanding the sample rate and DRC on the TAS5825M. We feed the TAS with variable sample rates up to 44.1kHz, 48kHz, 88.2kHz and 96kHz. Our test setup is a PurePath Console motherboard equipped with a TAS5825EVM. Among other things a 3-band EQ is programmed (on a 48kHz process-flow). Basically everything works. What would be the optimal setting for the parameters in the field Sample Rate Conversion (Base Sample Rate and Input Sample Rate) and for the register bits FSMODE? If the Base Sampling Rate is the rate at which the coefficients are calculated, why should the FSMODE bits be set manually for e.g. 44.1kHz? If the Base Sampling Rate is set to As Input, why is the Input Sampling Rate only displayed as 48kHz?

How do the above settings affect the EQ coefficients? Are they changed in the generated header file according to what?

Many thanks and best regards
Mario

  • 0
    TI__Genius 13970 points

    Hello Mario,

    We say in the datasheet that you "Need to set it manually If the input Fs is 44.1kHz/88.2kHz/176.4kHz" is that TAS5825 does not make a difference with 48kHz & 44.1kHz, 96kHz & 88.2kHz... which means the PLL frequency factors are the same.

    It's highly suggested to keep these bits to default Auto detection configuration if you do not mind the PWM switching frequency varies between 384kHz & 354.2kHz. However if you do set the FSMODE the PWM frequency will still be 352.8kHz but it would allow for capability for switching the EQ bank for supported modes(2 Band DRC & AGL flow).

    best regards,

    Luis