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Y.Vosko
Y.Vosko
Associate
February 5, 2023
Solved

DD-out pin on the TDA7376B

Hello everyone.

what the DD-out pint is used for on the TDA7376B?

Does it cancel out the channel when it detect clipping on that channel?

    This topic has been closed for replies.
    Peter BENSCH
    Peter BENSCHBest answer
    ST Technical Moderator
    February 6, 2023

    Welcome, @Y.Vosko​, to the community!

    The TDA7376B does indeed contain the THD Detection function, which includes the DD OUT and THD SET pins. The datasheet says:

    The TDA7376B is equipped with a programmable clipping distortion detector circuitry that allows to signal out the output stage saturation by providing a current sinking into an open collector output (DD OUT) when the total harmonic distortion of the output signal reaches the preset level.

    It further mentions that the voltage at THD SET should be proportional to the supply voltage, which is realised e.g. with the voltage divider in Fig. 3, 4 or 5.

    The quoted paragraph states that the function only detects when the THD limit is exceeded and then activates an open collector at the DD OUT output so that an external circuitry can do the intended reaction (limiting the volume, stronger compression or similar).

    Does it answer your question?

    Regards

    /Peter

    In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
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    3 replies

    Peter BENSCH
    Peter BENSCHBest answer
    ST Technical Moderator
    February 6, 2023

    Welcome, @Y.Vosko​, to the community!

    The TDA7376B does indeed contain the THD Detection function, which includes the DD OUT and THD SET pins. The datasheet says:

    The TDA7376B is equipped with a programmable clipping distortion detector circuitry that allows to signal out the output stage saturation by providing a current sinking into an open collector output (DD OUT) when the total harmonic distortion of the output signal reaches the preset level.

    It further mentions that the voltage at THD SET should be proportional to the supply voltage, which is realised e.g. with the voltage divider in Fig. 3, 4 or 5.

    The quoted paragraph states that the function only detects when the THD limit is exceeded and then activates an open collector at the DD OUT output so that an external circuitry can do the intended reaction (limiting the volume, stronger compression or similar).

    Does it answer your question?

    Regards

    /Peter

    In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
    Y.Vosko
    Y.VoskoAuthor
    Associate
    February 6, 2023

    Yes thank alot .

    Just for conclusion the DD out wount do nothing regarding the output it just an indicator .

    Peter BENSCH
    Peter BENSCH
    ST Technical Moderator
    February 6, 2023

    Yes, correct.

    If the problem is solved, please mark this thread as answered by selecting Select as best, as also explained here. This will help other users find that answer faster.

    Good luck!

    /Peter

    In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
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