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TAS5534 Headphone Configuration Procedure

Sadanori Kato
Guru 36490 points
Other Parts Discussed in Thread: TAS5548

Hi,

Although we read data sheet, we did not understand the headphone configuration procedure in detail.
So, if you have the application note about this, could you please send us to it?
In addition, could you please tell us the headphone amp that you recommend and the schematic that is included low pass filter?
We found TAS5518EVM user's guide as below.
Can we use this material as a reference?

http://www.ti.com/lit/an/slea061/slea061.pdf

Best Regards,
Kato

  • 0
    TI__Guru**** 189399 points

    Hi, Kato-san,

    Sorry, we don't have any application note.

    I have asked my colleague to work on this issue with you.

    -d2

  • 0 in reply to Don Dapkus
    Guru 36490 points

    Hi Don-san,

    We are looking forward to your reply for this issue.

    Best Regards,
    Kato

  • 0
    TI__Mastermind 37045 points

    Hi, Kato-san,

    You may refer to TAS5548/58 EVM for the low pass filter recommendation. It uses TPA6138 headphone amp and is configured as MFB low pass filter. There is an error on the schematic. Please see the post below -

    http://e2e.ti.com/support/amplifiers/audio_amplifiers/f/6/t/324317.aspx

    Below are some notes on the headphone output -

    Headphone output is in AD mode.

    When using the headphone with mute, please note the following sequences. The first sequence will not produce headphone output -  

    1. In speaker output mode (i.e. /HP_SEL = high), mute the output (i.e. write reg 0x0F = 0xFF)

    2. Switch to headphone (i.e. /HP_SEL = low)

    3. Unmute the output (i.e. write reg 0x0F = 0x00), both headphone and speaker have no output

    The second sequence will provide headphone output -

    1. Start with speaker output, /HP_SEL = high

    2. Disable auto-mute, write reg 0x04 = 0x73

    3. Mute output, write reg 0x0F = 0xFF, now no output in speaker

    4. Switch to headphone, pull /HP_SEL = low. Read reg 0x0F=0x00, read reg 0x04=0x53

    6. Disable auto-mute again, write reg 0x04 = 0x73, there will be headphone output

    reg,

    Paul.

  • 0 in reply to user5276421
    Guru 36490 points

    Hi Paul-san,

    Thank you for your explanation.
    We believe that we modify schematics as below.
    Is our understanding correct?

    Best Regards,
    Kato

  • 0 in reply to Sadanori Kato
    TI__Mastermind 37045 points

    Kato-san,

    That is correct.

    reg,

    Paul.

  • 0 in reply to user5276421
    Guru 36490 points

    Hi Paul-san,

    Thank you for confirming.
    I understood.

    Best Regards,
    Kato