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TLV320AIC3268: Schematic Review Request

Genius 3175 points

Replies: 3

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Part Number: TLV320AIC3268

Hello,

Could you check if there is any miss in attached schematic?

Regards,

Nicky

Schematic.pptx

  • Nicky, 

    1. All unused analog inputs can be tied together and terminated with a single capacitor.  0.1-0.47uf recommended. 

    2. Codec_line_out  should have some kind of passive LPF to filter out of band noise from the output before it goes to a CLASS-D amplifier. 

    3.if you are not using the Class-D amplifier,  it may make sense to connect that supply to 3.3V and use fewer/smaller decoupling caps. save you some board space and $. 

    -STeve Wilson

  • In reply to Steve-Wilson:

    Hi Steve,

    There is further questions.

    2. Codec_line_out  should have some kind of passive LPF to filter out of band noise from the output before it goes to a CLASS-D amplifier.  

        ==> LPF is composed before Class-D AMP input as attached. Is this LPF sufficient?

    3.if you are not using the Class-D amplifier,  it may make sense to connect that supply to 3.3V and use fewer/smaller decoupling caps. save you some board space and $. 

      ==> Using Class-D AMP as attached. Then Codec supply doesn't need to change to 3.3V?

    Please see attached Class-D AMP schematic.

    Regards,

    Nicky

  • In reply to Nicky Lim:

    Nicky,

    Re2 - The LPF recommended is 

    3. I am referring to the Class-D amplifier in the AIC3262.  if you aren't using it SPK_VDD can be connected to 3.3.  Not a big deal since you aren't using it... 

    best regards,

    -STeve wilson