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What is the name of the Analog Low Power Bypass Amp?

MikeH
Guru 15580 points


I am using the AIC3204 and am trying to initialize the Low Power Analog Bypass from IN1 to HP outs. But only one of the channels is actually passing audio. I have not initialized the "bypass amp" and suspect that it may be at max attenuation. However, I cannot find the name of this amp (attenuator) in the datasheet, nor its register. Can someone point out the register number/name for this amp?

thx

MikeH

 

  • 0
    Guru 15580 points

    6.2.125 Page 1 / Register 22: IN1L to HPL Volume Control Register

    6.2.126 Page 1 / Register 23: IN1R to HPR Volume Control Register

    However, setting these did not fix the problem. I still have only left channel audio.

  • 0 in reply to MikeH
    TI__Mastermind 46195 points

    Mike,

    The code below (hex) bypasses IN1L/R to HPL/R. Note that this is using external AVDD supply, so it should be modified accordingly if internal ALDO is used.

    ###############################################
    # Software Reset
    ###############################################
    #
    # Select Page 0
    w 30 00 00
    #
    # Initialize the device through software reset
    w 30 01 01
    #
    ###############################################

    ###############################################
    # Initialize Codec
    ###############################################
    #
    # Select Page 1
    w 30 00 01
    #
    # Disable weak AVDD in presence of external
    # AVDD supply
    w 30 01 08
    #
    # Enable Master Analog Power Control
    w 30 02 00
    #
    # Set the input powerup time to 3.1ms (for ADC)
    # w 30 47 32
    #
    # Set the REF charging time to 40ms
    w 30 7b 01
    #
    ###############################################

    ###############################################
    # Playback Setup
    ###############################################
    #
    # Select Page 1
    w 30 00 01
    #
    # De-pop
    w 30 14 25
    #
    # Direct Bypass Gain = 0dB
    w 30 16 00 00
    #
    # Route IN_1L/R to HPL/R
    w 30 0C 04 04
    #
    # Power up HPL/HPR drivers
    w 30 09 30
    #
    # Unmute HPL/HPR driver, 0dB Gain
    w 30 10 00 00
    #
    ###############################################

     

    Regards,

    J-