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TLV320DAC32: Not getting an output with a input to the DAC

RJ
Intellectual 2550 points

Part Number: TLV320DAC32

Hi Team,

Working on a design with the TLV320DAC32EVM and wanted to get some clarification. We are trying to get the most basic functionality out of is before moving to other use case. Starting by getting LINEL or LINER inputs driven on the outputs. Function generator is sourcing a 1kHz tone on the LINER test point on the EVM but there is not tone on the DAC output. Scope shots are attached as well as settings that are being used. 

Both the LEFT and RIGHT DAC output path setting is selected as "Mixed with analog inputs" and both DAC paths are set to mute.

Any suggestions as to why we are not seeing 1kHz on any of the outputs.

Regards,

Ramon

DAC Files.zip

  • 0
    TI__Guru** 114525 points
    Hi Ramon,

    Below is a script for a basic configuration, it uses analog inputs and routes them to HPROUT and HPLOUT as single-ended outputs. HPxCOM outputs are not used in this config. You should set the line bypass and also route the signals to the desired outputs.

    #################################
    ###### Analog Input ######
    ###### Stereo Single Ended ######
    #################################

    ## Device address: 0011000
    ## 00110000 = 0x30

    w 30 00 00 # Go to page 0
    w 30 01 80 # SW reset
    w 30 0E 80 # AC-coupled driver
    w 30 25 20 # HPLCOM independent output
    w 30 26 10 # HPRCOM independent output
    w 30 28 16 # LINEL/LINER bypass, soft-stepping disabled
    w 30 2D 80 # LINEL routed to HPLOUT
    w 30 33 0D # HPLOUT unmute, fully powered up, 0dB
    w 30 3A 04 # HPLCOM muted, not fully powered up
    w 30 3E 80 # LINER to HPROUT
    w 30 41 0D # HPROUT unmute, fully powered up, 0dB
    w 30 48 04 # HPRCOM muted, not fully powered up

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    TI__Intellectual 1170 points

    Hello,

    I am the Field Apps supporting Ramon with this customer. 

    He says the audio output sound a bit crunchy, like maybe the bit depth is too low. Do you know why this might be happening? How does the GUI affect the register settings?

    Thanks,

    Arash Sabet-Payman

  • 0 in reply to Arash Sabet-Payman
    Expert 1840 points

    Hi I'm the customer!

    The script to configure the line input worked perfectly.  I must have had some issue with using the GUI to set up what I wanted.

    The "crunchy" sound came as I moved to using an I2S source of audio.  I will open a new post for that issue.

    Thanks for the solution!

    Arthur

  • 0 in reply to Arthur Thompson27
    TI__Guru** 114525 points
    Arthur,

    Thanks for your inputs. I'll close this thread now.
    Will take a look at your new post accordingly.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators