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TPA6211A1: Looking for a Diff amp to integrate to PCM1782

Nigel Taylor
Intellectual 345 points
Part Number: TPA6211A1
Other Parts Discussed in Thread: TPA2038D1, TPA2011D1, LM4871, PCM1789, TAS2552, LM48511

looking at using the TPA6211A1 for an output to a 3.125W amplifier into 8 ohm however this only appears to go to ~1.3W im looking for around 3.12W do you have any alternatives again its a diff input of the same Voltage ?

  • 0
    TI__Mastermind 20085 points
    Hi Nigel,

    TPA6211A1 can achieve an output power of 3.1 W, but you need to use a load of 3Ω.
    You could have a look at the following devices: TPA2038D1, LM4871, and TPA2011D1. These devices can handle this output power with a load lower than 8Ω.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer
  • 0 in reply to José Luis
    Intellectual 345 points

    Hi José,

    Looked through the data sheets these all seem to run at a lower power rating when going into an 8 ohm load I did look at the TAS2552 which appears to output a max 4W into an 8ohm load, because I'm using analogue signals from the PCM1789 then I would not need to use the Digital Audio input but unclear what I would do with these inputs. Would I need to attenuate the PCM1789 diff outputs?

    Thanks

    Nigel

  • 0 in reply to Nigel Taylor
    TI__Mastermind 20085 points
    Hi Nigel,

    I think that you could try the next alternatives. You can use TAS2552's digital audio input instead of PCM1789 or you can connect the PCM1789 to TAS2552's analog audio input.
    Please let me know your thoughts.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer
  • 0 in reply to José Luis
    Intellectual 345 points
    Hi José,

    Thanks for the quick response the problem I have with the integral DAC of the TAS2552 is that it is 16 bit only I'm using 24 bit DACs so no good for my requirement unfortunately looking at my requirement it reads: The output channels shall be capable of driving into loads as low as 8ohms with a full-scale voltage of 5Vpp which looking at the first device I selected appears to fit the solution I had assumed that the Watts that I required where the calculation of 5Vpp into an 8 ohm load I now believe that I can revert back to the TPA6211A1 .

    Thanks
    Nigel
  • 0 in reply to Nigel Taylor
    TI__Mastermind 20085 points
    Nigel,

    I understand about bus capacity. But you can connect PCM1789 to the TAS2552's analog audio input.
    Another alternative could be to use the LM48511. This device can achieve an output power of 3W with a load of 8Ω.
    Please let me know your thoughts.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer
  • 0 in reply to José Luis
    Intellectual 345 points

    Hi José,

    Thanks very much for the response, I'm liking the both the TAS2552 and the LM48511 and not much price difference between the two, however for future scope I think the TAS2552 looks more applicable has it gives me the option of both analogue and digital inputs for future products.

    I just now need to take a look at the analogue interface between the PCM1789 and to check the Vpp is with in range because the PCM1789 outputs 4Vpp on each diff pair might have to attenuate the input.

    Thanks

    Nigel