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TAS5760MD: about DCE function

toshi-e2e
Genius 4760 points
Other Parts Discussed in Thread: TAS5760MD

Hi all,

I have some questions about DCE specification.

Q1: According to the datasheet of TAS5670MD of P7, DCE (thres) is 2.6V as a typical value.
However, explanation of P33 is mentioned that this value is the minimum output offset voltage.
Which is the right expression in "typical threshold voltage" or the "minimum output offset voltage"?

P33: DC DETECT PROTECTION

The minimum output offset voltages required to trigger the DC detect are show in Table 2. The outputs must
remain at or above the voltage listed in the table for more than 420 msec to trigger the DC detect.

Q2: The dasheet  described that   "The TAS5760MD has circuitry which will protect the speakers from DC current  
        which might occur due to an internal amplifier error."

        What kind of case are considered as a possibility of an internal error?
        When an error occurs, can the device return normally? Is there any possibility of break?

Regards,
Toshi

  • 0
    TI__Mastermind 34705 points

    Toshi-san,

    Q1:

    The values in table 2 on P33 of TAS5760MD d/s are typical DCE threshold values obtained when ramping the DC voltage low to high at the syated PVDD voltages. Sorry for the confusion, minimum was used to imply the direction of the ramp low to high, not to specify a minimum value.

    Q2:

    - If there is a large signal <4Hz and the HPF is unable to roll-off the signal to an acceptable level  or If one of the output half-brige is shorted to ground while playing audio. The DCE will trigger to protect the speakers.

    - DCE are latching error, which will shutdown the class D output and will require /SPK_SD to be toggled or /Tspk_fault time passes.