DD-out pin on the TDA7376B

Y.Vosko · ‎2023-02-05

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?

Peter BENSCH · ‎2023-02-06

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

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View solution in original post

Peter BENSCH · ‎2023-02-06

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 · ‎2023-02-06

Yes thank alot .

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

Peter BENSCH · ‎2023-02-06

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.