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I am planning to use TDA7498E in one of my projects and was going through the datasheet of the same and got confused at one point. In the absolute maximum ratings, it is written that the INPA, INNA, INPB, INNB have the maximum input ratings of -0.3V to +4V.

The thing which got me confused is that since the analog audio signal is more or less like a sine wave with equal peaks both in positive and negative, then how are we supposed to provide the input to the TDA7498E?

Any audio source will at one point give an audio signal greater than -0.3V (In absolute terms). Please let me know if I am thinking in the wrong direction.

Absolute Ratings

Datasheet

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  • \$\begingroup\$ Another thing that confuses me is that why have rated digital signals along with Analog signals. Two are completely different domains... \$\endgroup\$
    – DodZi
    Mar 3, 2021 at 19:01

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Audio is fed in differentially.

Page 7 of the datasheet has an example schematic that shows how it is done.

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  • \$\begingroup\$ Sorry, I missed that part but I intend to use this as single-ended Input. \$\endgroup\$
    – DodZi
    Mar 3, 2021 at 18:57
  • \$\begingroup\$ Yes, the schematic explains how you connect a single ended source into the chip which has differential inputs. \$\endgroup\$
    – Justme
    Mar 3, 2021 at 19:01
  • \$\begingroup\$ Supposing that my single-ended signal is a sine wave of 1Khz, 1Vp-p. How should I input this to TDA7498E? Should I bias it to a DC offset voltage? Because the negative half of the wave will kill the IC. \$\endgroup\$
    – DodZi
    Mar 3, 2021 at 19:03
  • \$\begingroup\$ Would you please actually look at the datasheet schematics to see how it is done. \$\endgroup\$
    – Justme
    Mar 3, 2021 at 19:04
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    \$\begingroup\$ OK, so why do you think TDA7498E does not provide a DC bias? Where does it say that it doesn't? If they provide the evaluation board schematics and say it can be connected to an audio source such as a DVD player or test equipment priced more than a new car, it would not make sense the chip just blows up. \$\endgroup\$
    – Justme
    Mar 3, 2021 at 22:43

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