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TAD5142: How to connect TAD5142 to a 3.5mm headphone jack

Sadanori Kato
Guru 36530 points
Part Number: TAD5142

Tool/software:

Hi,

Could you please tell me how to connect TAD5142 to a 3.5mm headphone jack with pseudo-differential output as stereo headphone amplifier?
I think I need to replace GND with common mode voltage. Is this possible to use it like this?

I would like to use TAD5142 in single-ended mode, so please let me know if there is a way to connect it to a 3.5mm headphone jack.

Best regards,
Kato

  • +1
    TI__Mastermind 23920 points

    Hi Kato,

    You can do it the way you described.  As a guide you can  refer to the schematic below for different options that we have added on EVM. ( users guide)

    Jumper configuration at DAC output

    TAD5142 in single-ended mode can be done for Lineout only as described  in table 6.9. of datasheet.

    Regards,

    Arash 

  • 0 in reply to Arash Loloee
    Guru 36530 points

    Hi Arash-san,

    Thank you for your prompt reply.

    I would like to confirm just in case, is my understanding correct that pseudo-differential mode is a stereo output such as Lch is channel-1 and Rch is channel-2 ? Or is pseudo-differential mode a mono?
    Where should the sleeve of jack be connected on EVM if TAD5142 is used with pseudo-differential mode? I cannot find where IN1M and IN2M of J30 are connected.

    Best regards,
    Kato

  • +1 in reply to Sadanori Kato
    TI__Mastermind 23920 points

    Hello Kato-san,

    in Pseudo differential, the INM is connected to VCM,  thus the OUTM is sitting at VCM (wrt GND), The outputs are still taken differentially  from VOUTP and VOUTM , however in this case VOUTN is sitting at VCOM and thus the name is Pseudo differential. So you can connect the jumper to INM1 for channel one.

    Regards,

    Arash 

  • 0 in reply to Arash Loloee
    Guru 36530 points

    Hi Arash-san,

    Thank you for your response.

    According to TAD5142 datasheet, OUT2M should be connected to the common mode voltage VCM for pseudo differential. The sleeve(VCM) is connected to INM1 with jumper J30. What jumper should I set on the EVM to connect VOUT2M to VCM?

    Please let me ask one more basic question. Is it correct that the Lch data is output from OUT1P and the Rch data is output from OUT2P in pseudo-differential? That is, stereo data is output. Or is it a mono output where the Lch data is output to OUT1P and OUT2P?

    Best regards,
    Kato

  • +1 in reply to Sadanori Kato
    TI__Mastermind 23920 points

    Hello Kato-san,

    For output configuration please refer to the following 2 tables in datasheet: Table 6-1. Pin Selectable Configurations Summary   and  Table 6-9. Analog Output Configurations   

     This is also briefly tabulated for all ADC/DAC function in the users guide,  section 2.3.3.4 MD4 and MD5 Hardware Configurations.

    This DAC is a stereo (2 Ch) DAC, and one set of output is for CH1 and anther set of output is for Ch2. In  the PD  case,  you still get  stereo output, one channel from OUTP2 and one channel form OUTP1 . 

    Regards,

    Arash

  • 0 in reply to Arash Loloee
    Guru 36530 points

    Hi Arash-san,

    Thank you for your information.

    I understand.

    Best regards,
    Kato