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PGA2320 more output current

keith ong

Other Parts Discussed in Thread: PGA2320, LME49600, LME49720

I would like to have more output current (Short-Circuit Current) for my audio device. would it be possible to connect 2 or 3 PGA2320 in parallel? (meaning shorting pin1 of the first PGA2320 to pin 1 of the 2nd PGA2320 and so on for every pin on the first PGA2320 to the 2nd PGA2320) 

other suggestions are also welcomed

Thank you 

  • 0
    TI__Guru**** 189401 points

    Hi, Keith,

    Not that I don't like selling lots of PGA2320s, but wouldn't it make more sense to use some kind of high-current buffer on the output of a single PGA2320?

    What advantage do you see in paralleling multiple PGAs? 

    -d2

  • 0 in reply to Don Dapkus

    Hi Don,

    Thanks for the quick reply. Could you recommend me a high fidelity audio buffer that i could use with the PGA2320.

    Thanks 

  • 0 in reply to keith ong
    TI__Guru**** 189401 points

    Hi, Keith,

    How about the LME49600? It has 250 mA of output capability. You can run it off the same +/-15V supplies as the PGA2320.

    -d2

  • 0 in reply to Don Dapkus

    Hello Don,

    Happy new year and well-wishes to you. i have looked into the LME49600 and it is a really good chip with top specs, which is what i am looking for. the only problem is that it needs to be inside the feedback loop of an OP-Amp, which is not possible as the feedback loop of the PGA2320 is inside the chip and not accessible to me. are there any other good buffers that can just simply be connected to the output of the PGA2320?

    Thanks again

    Keith Ong

  • 0 in reply to keith ong
    TI__Expert 3840 points

    Hi Keith,

    I haven't tried it, but you should theoretically be able to drive the LME49600 directly from the PGA2320 without an extra op amp. However, using an op amp with the LME49600 will correct for offset and ensure stability. If you find that there are stability problems from just using the LME49600, I would recommend selecting one of the op amps suggested below.

    Typically op amps don't supply a lot of output current to keep their size small.

    As a way to bump up output current, we have provided the LME49600 to work in conjunction with an op amp for just this solution. We offer many really good op amps to work with the LME49600, including the LME49710 (single), LME49720 (dual). An ultimate wide-bandwidth high slew-rate solution would utilize the LME49713 current feedback op amp.

    Using the buffer with the op amp, allows the customer to select the op amp of their choice while providing the extra needed output current.

    If more current than the LME49600 is required, you would then move into the IC power amplifier category.

    Best Regards,

    JD