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ouyang
Explorer II
March 10, 2025
Solved

How to set the gain of the TDA7491 HV 30/31 pin GAIN 0/ GAIN pin?

How to set the gain of GAIN0/GAIN1 pins 30/31 of TDA7491HV?

ouyang_0-1741596400626.png

 

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Peter BENSCH
Peter BENSCHBest answer
ST Technical Moderator
March 10, 2025

Welcome @ouyang, to the community!

You can configure the two pins according to the desired closed-loop gain. According to the data sheet, table 7, you can choose between 20/26/30/32dB.

In the picture you have inserted, both pins are set to VDDS = H, which corresponds to an open-loop gain of 32dB.

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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2 replies

Peter BENSCH
Peter BENSCHBest answer
ST Technical Moderator
March 10, 2025

Welcome @ouyang, to the community!

You can configure the two pins according to the desired closed-loop gain. According to the data sheet, table 7, you can choose between 20/26/30/32dB.

In the picture you have inserted, both pins are set to VDDS = H, which corresponds to an open-loop gain of 32dB.

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.
    AScha.3
    AScha.3
    Super User
    March 10, 2025

    See ds , figure 22 :

    Gain settings: 0+0 V -> 20dB , 3+3 V -> 32dB , etc.

    If you feel a post has answered your question, please click on " Best Answer ".
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