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PCM1795: Actual sample rate

Yu Yi
Prodigy 70 points

Part Number: PCM1795
Other Parts Discussed in Thread: PCM5142, PCM5242

I am about to make a purchase on this board build by PCM1795

Question I have is when it play DSD256 music source on DoP, what actual bitrate will it play since it is limited to 192K at the highest?

  • 0
    TI__Guru 56923 points

    Hi Yu,

    This is kind of a complicated question, as the PCM1795 will at some point convert the DSD data internally to a format that the advanced segment architecture and utilize.  A sample rate of 192k is the highest input fS, but the device can still oversample above that.  Take a look at table 39 to best calculate the final sample rate with you input DBCK rate.

    Let me know if that clarifies things.

    Thanks!

    Paul

  • 0 in reply to Paul_Frost
    Prodigy 70 points
    Thanks for the info Paul, it was a pleasure to meet you during CES this year, my name is Yu Yi, from Gilbert, Arizona.

    The question has been answered and we don't know the exact answer not until we actual set it up and hear it.

    Additional question I have: what tools you can recommend for read/write/status registers for TI DACs?
  • 0 in reply to Yu Yi
    TI__Guru 56923 points
    Hi Yu! Great to hear from you!

    So the software for the various TI PCM DACs is a bit scattered.

    PCM512X - Purepath studios, and PurePath Console 1.16
    PCM5142 - Purepath studios and PurePath Console 1.16
    PCM5242 - PurePath Console 2

    We current do not have EVMs for the PCM17XX series devices - but I am actively trying to create new ones. Most of those devices have pretty straight forward digital interfaces and register maps - most MCUs and digital IO tools should be able to handle them.

    Thanks!
    Paul
  • 0 in reply to Paul_Frost
    Prodigy 70 points
    Thx, ordered the board and it will gets to PHX around 2 weeks and let you know the result.

    Meanwhile, have you use BeagleBoard? Had one set of BBG (BeagleBone Green) wiki.seeed.cc/.../
    Believe it use most TI chips and it has 2 PRUs (Programmable Real-time Unit) MCUs built-in running 200MHz, 32-Bit

    events.static.linuxfound.org/.../Enhancing RT Capabilities with the PRU final.pdf

    My ideal goal will be running Volumio on BBG and be able to control everything with less boards:

    => MCU => DAC
    BBG => USB-transceiver => DAC

    Question is will it work that way?

    Any input is appreciated, thx!
  • 0 in reply to Yu Yi
    TI__Guru 56923 points
    Hi Yu,

    Unfortunately I do not have any experience with the BBG or the PRUs - I think you should check out the MCU forums and see if they have any input.

    Thanks!
    Paul
  • 0 in reply to Yu Yi
    Prodigy 70 points
    ARM section under MCU is read-only for some reason