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TAC5242: Migrating from PCM3060 to TAC5242

Jaak Jensen
Prodigy 30 points
Part Number: TAC5242
Other Parts Discussed in Thread: PCM3060

Tool/software:

I'm working on migrating a design from PCM3060 to TAC5242. The design we have is single ended input and single ended output. On the PCM3060, we convert the output from the converter to single-ended using the recommended differential to single ended converter from the datasheet.

I'd like to make the most of the TAC5242's SNR, so I'm interested in using it in differential in / differential out mode.

To do this, I assume I'll need to convert the input signal to differential for the TAC5242 inputs and then convert the output of the TAC5242 from differential to single-ended. The TAC5242 provides no reference design for this but I'm wondering if I can use a similar output circuit from the PCM3060 and then use a simple inversion at the input to convert the input to differential.

Any feedback would be appreciated.


  • +1
    TI__Genius 12995 points

    Hi,

    I think this should work, especially if it worked on the PCM3060. Just keep in mind that on the input side, you may amplify signal noise coming through the input, and would just decrease the noise after the capacitors on the output (this would be especially helpful if you had a long connection between your input and the codec). The TAC5242 has a single ended input option as well that may be fine for your purposes, with ~110dB of SNR. If you experience issues with your SNR with your input converter circuit, you can try just connecting the single ended input. 

    Best,
    Mir

  • 0 in reply to Mir Jeffres
    Prodigy 30 points

    Thanks ! Being able to remove the other op amp by just disconnecting it is a great backup plan. I will add in some extra configuration jumpers to be able to reconfigure the input as single ended just in-case. Thank you.