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TPA6120A2: Using TPA6120A2 in differential output mode

sebastien castel
Prodigy 160 points
Part Number: TPA6120A2
Other Parts Discussed in Thread: TLV320AIC3268, OPA2134, OPA132

Tool/software:

Hello,

i planned to connect the TPA6120A2  to the TLV320AIC3268 (SPKP/M or RECP/M or HPL/R) then connect it to a mono speaker from 8 to 300 ohms.

Would you recommend any schematics for this configuration ? as the datasheet mentions only the stereo configuration.

Your help would be very appreciate.

Thank you

Sebastien

  • 0
    TI__Genius 16645 points

    Hi Sebastien,

    I can look for any additional schematics but most of the schematics or example design circuits for this device will be in the datasheet. For a speaker connection it would be very similar to the schematics we share. I am not sure about the connection from the amplifier to the TLV320AIC3268 and what it is meant to drive. However as long as the TPA6120A2 is configured with the correct Rf (1kOhms ideally) in a standard configuration, I do not see why you couldn't connect to the TLV320AIC3268. I would create a separate thread with the TLV320AIC3268 and get more information on the requirements for driving the analog input portion of the device.

    Best Regards,

    Ignacio

  • 0 in reply to Ignacio Vazquez Lam1
    Prodigy 160 points

    Hello Ignacio,

    Thank you for your reply.
    I'm not sure how to adapt the examples to a configuration where ROUT and LOUT are 180° out of phase.
    One important point: I'd like to operate the TPA6120A2 with a single supply (0V / +12V), unless that's not recommended.
    Also, the examples mention using an OPA2134 between the DAC and the TPA6120A2 — is this necessary when using the TLV320AIC3268? I'm aiming for something simple.

    Sebastien

  • 0 in reply to sebastien castel
    TI__Genius 16645 points

    Hi Sebastien,

    Just for some clarity, do you mean the signal you require is a differential signal or is the incoming signal differential and need single-ended. The device can operate on a single supply, however additional circuitry such as DC-blocking caps would likely be required as your output is now biased to mid-supply. For the example you are referencing, that specific DAC outputs current which requires a transimpedance stage prior to the TPA6120A2, which is what the OPA132 was used for. I do not believe the TLV320AIC3268 outputs current, but this would have to be confirmed with the team of this device by opening a separate thread. It seems like the device is capable of driving some kind of load directly without any amplifier, but this would also have to be confirmed with that team.

    Best Regards,

    Ignacio

  • 0 in reply to Ignacio Vazquez Lam1
    Prodigy 160 points

    Hi Ignacio,

    i need a differential output such like this: 

  • 0 in reply to sebastien castel
    TI__Genius 16645 points

    Hi Sebastien,

    The way it is shown, you could configure the TPA6120A2 channels in a non-inverting gain. I am not sure you need a transimpedance stage as I believe it is a voltage output. Since you will be using this device in a single supply, and it appears the outputs of the TLV320AIC3268 are centered around ground, you would have to use dc-blocking caps both at the input and output. To not violate your input common-mode voltage range, you would also have to bias your circuit to mid-supply.

    Best Regards,

    Ignacio