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DIR9001-Q1: Does this device support TDM?

Johnny Guo
Expert 4910 points
Part Number: DIR9001-Q1
Other Parts Discussed in Thread: DIR9001, PCM9211

Hi, team,

May I ask the question that is DIR9001-Q1 support TDM? Or only I2S?

Thanks.

Johnny

  • 0
    TI__Guru 62085 points

    Hello Johnny,

    No, the DIR9001 does not support TDM outputs.  It supports I2S, LJ, and RJ.

    The PCM9211 also features a DIR, but it also only supports I2S, LJ, and RJ.

  • 0 in reply to Collin Wells
    TI__Expert 4910 points

    Thanks Collin for clarify this.

  • 0 in reply to Collin Wells
    TI__Expert 4910 points

    Hi, Collin,

    One more question for DIR9001-Q1. In system test, DIR9001-Q1 is set as Master and Audio processor is set as Slave.

    Can we exchange the role of two devices? That is DIR9001-Q1 as Slave and audio processor as master?

    Thanks.

    Johnny

  • 0 in reply to Johnny Guo
    TI__Guru 62085 points

    Hi Johnny,

    It's not possible to operate the DIR9001-Q1 as an Audio Serial Interface (ASI) bus slave device, which would mean that the SCLK, BCLK, and LRCLK signals would be inputs to the DIR9001, and only DOUT would be an output. The SCLK, BCLK, and LRCLK signals are always outputs with the DIR9001.  

    However, it is possible to synchronize the SCLK, BCLK, and LRCLK with an external master by feeding in a 5V, 24.576MHz clock as described on Page 16 in the "XTI Clock Source and Oscillation Amplifier" section of the datasheet. 

    If you look at Figure 7 it shows the clocking tree for the different outputs and that the XTI clock input will directly divide down to drive the SCK/BCK/LRCK outputs which may meet your requirements.

  • 0 in reply to Collin Wells
    TI__Expert 4910 points

    Hi, Collin,

    I have one question about DIR9001 EVM.

    Below is waveform we tested on EVM through SN74LVU04 to DIR9001 RXIN. Vcc is 3.3V. We tested input signal and pin 1/2/4 signal waveform. My questions:

    1. In EVM user guide BOM, R002 is 47ohm, not 47kohm in schematic. Which one is correct for EVM?

    2. For SN74LVU04 on EVM, how to design R002 and R003 resistor divider? Inverter output voltage is supposed to be equal to Vcc, but from calculation, pkpk voltage on pin2 is not the same as we tested by scope.

    SN74LVU04 schematic in EVM user guide.

    CN001 input signal. pkpk is 520mV.

    SN74LVU04 pin1 signal, pkpk is 550mV, offset is 1.5V.

    SN74LVU04 pin2 signal, pkpk is 2.82V.

    SN74LVU04 pin4 signal, pkpk is 3.3V, equal to Vcc.

    Thanks,

    Johnny

  • 0 in reply to Johnny Guo
    TI__Guru 62085 points

    Hello,

    I double-checked the BOM that's used to build the EVMs and the R002 component value is supposed to be 47kOhms and R003 is 2.2kOhms which matches the schematic drawing.

    There are two things which contribute to the pin 2 behavior

    1.)  The load is 2.2k which will reduce the VOH/VOL levels due to the increased output current. 

    2.)  When the input to a digital circuit is not a strong logic "0/1" as shown on the Pin 1 voltage, then the output is not driven as strong as it would be if it was.

    This is why an additional inverter was added and the Pin 4 output is used for the DIR9001 input.