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Original question:

PCM1865: PCM1865 dual TDM mode

PCM1865: Dual ADC's sharing the TDM line - Power down?

T_DK
Prodigy 50 points
Part Number: PCM1865
Other Parts Discussed in Thread: PCM1862,

Hi,

the datasheet mentions the dual TDM mode for 2 PCM186x chips.

I have one DSP master and 2 slave ADC's.

1) Is it possible to reduce power consumption by setting either ADC1 or ADC2 in Idle, Sleep or Standby and get the Hi-Z mode on that DOUT, when the other ADC is running?

2) It is possible to set a PCM1865 (4ch) and a PCM1862 (2ch) on the same TDM-line? What happens with the not used frames?

Thank you!

Thomas

  • 0
    TI__Genius 13610 points

    1. You could but whatever is receiving the data will be interpreting as two separate TDM streams and slow down the audio capture as you switch between devices

    2. You can put on same TDM line you just need to program so data comes out on different channels/slots if both devices are on at same time, this would let what's receiving the data interpret as a single TDM stream

    Best Regards,

    Carson

    LPA Applications Engineer

  • 0 in reply to Carson Allen
    Prodigy 50 points

    Hi Carson

    Thank you for your response. I have a small follow up for 1), as it's not quite obvious what happens.

    I control the receiving DSP setup, so I got that covered.

    It does not state in the datasheet if the DOUT is Hi-Z in which modes. 

    Can DOUT it be Hi-Z, even if I put it into lowest power standby-mode? Or is the DOUT circuitry unpowered in this state, clamping the DOUT to 0V?

    Do you have any more detailed datasheets describing this?

  • 0 in reply to T_DK
    TI__Genius 13610 points

    Yes DOUT will be maintained as Hi-Z if its output is muted and when you put in low power mode the output automatically becomes muted.

    Best,

    Carson