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TAS5710 in PBTL mode

Paulo Marques1
Prodigy 20 points
Other Parts Discussed in Thread: TAS5710, TAS5760MD, TAS5760M

Hi all,

I have an application that could use a TAS5710 amplifier in PBTL mode, to drive a single 4ohm speaker.

The datasheet doesn't say much about how to use it this mode, except for the electrical specifications that say it should support a 4 ohm speaker.

Since the amplifier has an output multiplex register, can we configure output1 to OUTA and OUTB and ~output1 to OUTC and OUTD and connect A+B together to one side of the output filter and C+D together to the other side?

This seems like it should work, but I just wanted to be sure before trying it.

Thanks in advance,

  • 0
    TI__Guru**** 189399 points

    Hi, Paulo,

    The TAS5710 is quite an old product. I'd suggest you look at one of our newer devices.

    For the TAS5710, you have to have an inductor on each output, and then you connect the PBTL after the inductors.

    If you look at one of our newer products like TAS5760MD, you'll see a PBTL pin which locks the two output bridges together, allowing you to use only two inductors for PBTL. Of course, those inductors much be sized for the appropriate current.

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 20 points

    Hi,

    Thanks for your fast reply!

    The TAS5760M does seem like the right choice for us. We don't need the TAS5760MD version, as the headphone / line out amplifier is of no use for this project.

    There are a few differences that I'm just posting in the interest of future readers of this thread (and please correct me if I'm wrong in any of them).

    Disadvantages:

    - TAS5760 is just slightly more expensive

    - the TAS5710 accepts the MCLK to be at just x64 FS when playing 44.1kHz or 48kHz audio. Since the serial clock can also be x64 FS, we can use a single clock source to drive both clocks when running in this mode. The TAS5760 requires the MCLK to be at least x128 FS which doesn't allow this. This might matter depending on the device that is driving the amplifier.

    - TAS5760 doesn't have the same complex internal digital processing block to allow for equalization and other sound effects

    Advantages:

    - more modern design with overall better audio characteristics (THD, idle noise, etc.)

    - supports 4ohm speakers in BTL stereo mode (or 2ohm in PBTL mode)

    - supports PBTL mode with just one output filter

    - easier to use with less registers to program, or even no registers to program (in hardware control mode)

    - supports 88.2 and 96 kHz sample rates

    Anyway, we are definitely going to use the TAS5760 for this design. Thanks for your help.