TLV320AIC3204 AGC MAXIMUM GAIN

Paolo Martinetti

Hi,

I use a Soc based on C5505 / AIC3204 codec. Codec is configured at 192 Khz in this way:

_AIC3204_rx:
	 ; Point to page 0
        AC1 = #0
        AR1 = #0x0
        call i2c_WriteData8

        ;reset codec
        AC1 = #1
        AR1 = #0x1
        call i2c_WriteData8

	 ; Point to page 1
        AC1 = #0
        AR1 = #0x1
        call i2c_WriteData8

        ;Disable crude AVDD generation from DVDD
        AC1 = #1
        AR1 = #0x08
        call i2c_WriteData8

        ;Enable Analog Blocks and LDO
        AC1 = #2
        AR1 = #0x01
        call i2c_WriteData8

        ;***********************************************************************
        ;* PLL and Clocks config and Power Up
        ;***********************************************************************

    ; Point to page 0
        AC1 = #0
        AR1 = #0x0
        call i2c_WriteData8

        ;BCLK and WCLK is set as op to AIC3204(Master) - 16 bits word
        AC1 = #27
        AR1 = #0x0D
        call i2c_WriteData8

        ;PLL setting: PLLCLK <- MCLK and CODEC_CLKIN <-PLL CLK
        AC1 = #4
        AR1 = #0x03
        call i2c_WriteData8

        ;PLL Power up; PLL Divider params: P = 1, R = 1
        AC1 = #5
        AR1 = #0x91
        call i2c_WriteData8

        ;PLL setting: J=8
        AC1 = #6
        AR1 = #0x08
        call i2c_WriteData8

        ;PLL setting: HI_BYTE(D) for D=0
        AC1 = #7
        AR1 = #0x07
        ;AR1 = #0x00
        call i2c_WriteData8

        ;PLL setting: LO_BYTE(D) for D=0
        AC1 = #8
        AR1 = #0x80
        ;AR1 = #0x00
        call i2c_WriteData8

        ;NDAC = 2
        AC1 = #11
        AR1 = #0x82
        call i2c_WriteData8

        ;MDAC = 8
        AC1 = #12
        AR1 = #0x88
        call i2c_WriteData8

        ;DOSR H  (DOSR = 32)
        AC1 = #13
        AR1 = #0x00
        call i2c_WriteData8

        ;DOSR L  (DOSR = 32)
        AC1 = #14
        AR1 = #0x20
        call i2c_WriteData8

        ;Clock Setting Register 11, BCLK N Divider N = 7
        AC1 = #30
        AR1 = #0x87
        call i2c_WriteData8

        ;Power up NADC and set NADC value to 2
	    AC1 = #18
	    AR1 = #0x82
	    call i2c_WriteData8

	    ;Power up MADC and set MADC value to 4 (ex 8)
	    AC1 = #19
	    AR1 = #0x88
	    call i2c_WriteData8

	    ;AOSR for AOSR = 64 (ex 32)
	    AC1 = #20
	    AR1 = #0x20
	    call i2c_WriteData8


    	; Point to page 0
        AC1 = #0
        AR1 = #0x0
        call i2c_WriteData8

		; DAC PRB
		AC1 = #60
        AR1 = #16
        call i2c_WriteData8

        ; ADC PRB
		AC1 = #61
        AR1 = #7
        call i2c_WriteData8

 ;***********************************************************************
 ;* DAC ROUTING and Power Up
 ;***********************************************************************

        ;Select page 1
        AC1 = #0
        AR1 = #0x01
        call i2c_WriteData8

        ;Left Channel DAC reconstruction filter's positive terminal is routed to HPL
        AC1 = #12
        AR1 = #0x08
        call i2c_WriteData8

        ;Select page 0
        AC1 = #0
        AR1 = #0x00
        call i2c_WriteData8

        ;Left and Right Channel have independent volume control
        AC1 = #64
        AR1 = #0x04
        call i2c_WriteData8

        ;Left DAC Channel Digital Volume +24dB
        AC1 = #65
        ;AR1 = #0x30
        AR1 = #0x30
        call i2c_WriteData8

        ;Power up left,right data paths and set channel
        AC1 = #63
        AR1 = #0x90
        ;AR1 = #0xB2
        call i2c_WriteData8

        ;Select page 1
        AC1 = #0
        AR1 = #0x01
        call i2c_WriteData8

        ;Unmute HPL , 0dB gain
        AC1 = #16
        AR1 = #0x00
        call i2c_WriteData8

        ;Mute HPR
        AC1 = #17
        AR1 = #0x40
        call i2c_WriteData8

        ;Power up HPL
        AC1 = #9
        AR1 = #0x20
        call i2c_WriteData8

		;DAC FILTER

		;Select page 44
        AC1 = #0
        AR1 = #44
        call i2c_WriteData8

		;BIQ 1 - N0
		AC1 = #12
        AR1 = #0x03
        call i2c_WriteData8

		AC1 = #13
        AR1 = #0x1A
        call i2c_WriteData8

		AC1 = #14
        AR1 = #0x85
        call i2c_WriteData8

		;BIQ 1 - N1
		AC1 = #16
        AR1 = #0x03
        call i2c_WriteData8

		AC1 = #17
        AR1 = #0x1A
        call i2c_WriteData8

		AC1 = #18
        AR1 = #0x85
        call i2c_WriteData8

		;BIQ 1 - N2
		AC1 = #20
        AR1 = #0x03
        call i2c_WriteData8

		AC1 = #21
        AR1 = #0x1A
        call i2c_WriteData8

		AC1 = #22
        AR1 = #0x85
        call i2c_WriteData8


        ;BIQ 1 - D1
		AC1 = #24
        AR1 = #0x63
        call i2c_WriteData8

		AC1 = #25
        AR1 = #0x2F
        call i2c_WriteData8

		AC1 = #26
        AR1 = #0xAC
        call i2c_WriteData8

        ;BIQ 1 - D2
		AC1 = #28
        AR1 = #0xAE
        call i2c_WriteData8

		AC1 = #29
        AR1 = #0xDB
        call i2c_WriteData8

		AC1 = #30
        AR1 = #0x1C
        call i2c_WriteData8


        ;BIQ 2 - N0
		AC1 = #32
        AR1 = #0x7F
        call i2c_WriteData8

		AC1 = #33
        AR1 = #0xFF
        call i2c_WriteData8

		AC1 = #34
        AR1 = #0xFF
        call i2c_WriteData8

        ;BIQ 2 - N1
		AC1 = #36
        AR1 = #0x80
        call i2c_WriteData8

		AC1 = #37
        AR1 = #0x00
        call i2c_WriteData8

		AC1 = #38
        AR1 = #0x01
        call i2c_WriteData8

        ;BIQ 2 - N2
		AC1 = #40
        AR1 = #0x7F
        call i2c_WriteData8

		AC1 = #41
        AR1 = #0xFF
        call i2c_WriteData8

		AC1 = #42
        AR1 = #0xFF
        call i2c_WriteData8


        ;BIQ 2 - D1
		AC1 = #44
        AR1 = #0x7F
        call i2c_WriteData8

		AC1 = #45
        AR1 = #0x5D
        call i2c_WriteData8

		AC1 = #46
        AR1 = #0x67
        call i2c_WriteData8

        ;BIQ 2 - D2
		AC1 = #48
        AR1 = #0x81
        call i2c_WriteData8

		AC1 = #49
        AR1 = #0x44
        call i2c_WriteData8

		AC1 = #50
        AR1 = #0x61
        call i2c_WriteData8

		@BRC0_L = #0x02FF || mmap()
		;localrepeat {
		;	repeat(#0xFFFF)
		;	NOP_16
		;	NOP_16
		;}


;***********************************************************************
;* ADC ROUTING and Power Up
;***********************************************************************


		;Select page 1
	    AC1 = #0
	    AR1 = #0x01
	    call i2c_WriteData8

		AC1 = #52
	    AR1 = #0xC0
	    call i2c_WriteData8

		;CM_1 (common mode) to LADC_M through 40 kohm
	    AC1 = #54
	    AR1 = #0x03
	    call i2c_WriteData8

		;Left MICPGA Volume Control 24dB
	    AC1 = #59
	    AR1 = #0x5F
	    call i2c_WriteData8

		;MIC_PGA_R unmute
	    AC1 = #60
	    AR1 = #0x80
	    call i2c_WriteData8

;//////////// AGC CONFIGURATION - START ////////////
        ;Select page 0
        AC1 = #0
        AR1 = #0x00
        call i2c_WriteData8

		;Left Channel AGC Control register 1 (Enable / Disable) - Target Level / Gain Hysteresys Control
		AC1 = #86
		AR1 = #0x80
		call i2c_WriteData8

		;Left Channel AGC Control register 2 Hysteresis setting / AGC noise threshod
		AC1 = #87
		AR1 = #0x06
		call i2c_WriteData8

		;Left Channel AGC Control register 3 - Maximum gain setting
		AC1 = #88
		AR1 = #0x00
		call i2c_WriteData8

		;Left Channel AGC Control register 4 - Attack Time setting
		AC1 = #89
		AR1 = #0x00
		call i2c_WriteData8

		;Left Channel AGC Control register 5 - AGC Decay Time setting
		AC1 = #90
		AR1 = #0x00
		call i2c_WriteData8

		;Left Channel AGC Control register 6 - Noise debounce time setting
		AC1 = #91
		AR1 = #0x01
		call i2c_WriteData8

		;Left Channel AGC Control register 7 - Signal debouce time setting
		AC1 = #92
		AR1 = #0x01
		call i2c_WriteData8

		;Left Channel AGC Control register 8 - AGC GAIN FLAG
		;AC1 = #93
		;AR1 = #0x00
		;call i2c_WriteData8

;//////////// AGC CONFIGURATION - END   ////////////

        ;Select page 0
        AC1 = #0
        AR1 = #0x00
        call i2c_WriteData8

        ;Unmute Left ADC and mute Right ADC
        AC1 = #82
        AR1 = #0x08
        call i2c_WriteData8

        ;Powerup Left ADC
        AC1 = #81
        AR1 = #0x80
        ;AR1 = #0x8A
        call i2c_WriteData8

        ;Dummy read
        AC1 = 9
        AR1 = 0xABAB
        call i2c_ReadData8



        return

I'd like to increase furthermore the amplification of my ADC input, because AGC makes it too low.

Any idea?

Thanks in advance

Paolo

over 7 years ago

0 Diego Melendez over 7 years ago

TI__Guru 57800 points

Hi, Paolo,

If the AGC is enabled, the gain of the input signal will be adjusted by the PGA until the signal level reaches the AGC's target level set. From your settings, the AGC is set to the highest value, so you should expect a signal with a decent gain on the output. I notice from your settings that the maximum PGA gain applied by the AGC is set to 0dB, which actually indicates that there is no gain to the ADC signal applied when the AGC needs to act. Please increase this value to 20dB or so to verify an increase of the ADC signal. Then you can modify it according to your system level requirements.

Best Regards,

-Diego Meléndez López
Audio Applications Engineer

0 Paolo Martinetti over 7 years ago in reply to Diego Melendez

Expert 2730 points

Thanks Diego.

My optimal value is obtained increasing, without AGC, the ADC volume at 4 dB (Register Page 0 Reg 83 = 0x08).

So, I increased it at 9.5 dB (0x13) and configured the AGC target level at -5.5 dB since 9.5 dB - 5.5 dB = 4 dB.

The result is i have no output to the speaker. What's wrong? ( here is my code of ADC / AGC configuration):

;***********************************************************************
;* ADC ROUTING and Power Up
;***********************************************************************



		;Select page 1
	    AC1 = #0
	    AR1 = #0x01
	    call i2c_WriteData8

		AC1 = #52
	    AR1 = #0xC0
	    call i2c_WriteData8

		;CM_1 (common mode) to LADC_M through 40 kohm
	    AC1 = #54
	    AR1 = #0xC0
	    call i2c_WriteData8

		;Left MICPGA Volume Control 24dB
	    AC1 = #59
	    AR1 = #0x5F
	    ;AR1 = #0x80
	    call i2c_WriteData8


		;MIC_PGA_R unmute
	    AC1 = #60
	    AR1 = #0x80
	    call i2c_WriteData8

;//////////// AGC CONFIGURATION - START ////////////
        ;Select page 0
        AC1 = #0
        AR1 = #0x00
        call i2c_WriteData8

		;Left Channel AGC Control register 1 (Enable / Disable) - Target Level / Gain Hysteresys Control
		AC1 = #86
		AR1 = #0x80
		call i2c_WriteData8

		;Left Channel AGC Control register 2 Hysteresis setting / AGC noise threshod
		AC1 = #87
		AR1 = #0x02
		call i2c_WriteData8

		;Left Channel AGC Control register 3 - Maximum gain setting
		AC1 = #88
		AR1 = #0x7F
		call i2c_WriteData8

		;Left Channel AGC Control register 4 - Attack Time setting
		AC1 = #89
		AR1 = #0x00
		call i2c_WriteData8

		;Left Channel AGC Control register 5 - AGC Decay Time setting
		AC1 = #90
		AR1 = #0x00
		call i2c_WriteData8

		;Left Channel AGC Control register 6 - Noise debounce time setting
		AC1 = #91
		AR1 = #0x01
		call i2c_WriteData8

		;Left Channel AGC Control register 7 - Signal debouce time setting
		AC1 = #92
		AR1 = #0x01
		call i2c_WriteData8

		;Left Channel AGC Control register 8 - AGC GAIN FLAG
		;AC1 = #93
		;AR1 = #0x00
		;call i2c_WriteData8

;//////////// AGC CONFIGURATION - END   ////////////

        ;Select page 0
        AC1 = #0
        AR1 = #0x00
        call i2c_WriteData8

	    ; Volume control?
	    AC1 = #83
	    AR1 = #0x13
	    ;AR1 = #0x80
	    call i2c_WriteData8

        ;Unmute Left ADC and mute Right ADC
        AC1 = #82
        AR1 = #0x08
        call i2c_WriteData8

        ;Powerup Left ADC
        AC1 = #81
        AR1 = #0x80
        ;AR1 = #0x8A
        call i2c_WriteData8

        ;Dummy read
        AC1 = 9
        AR1 = 0xABAB
        call i2c_ReadData8

Thanks in Advance

Paolo

0 Paolo Martinetti over 7 years ago in reply to Paolo Martinetti

Expert 2730 points

Any tip from someone?
Thanks a lot!

Paolo

0 Diego Melendez over 7 years ago in reply to Paolo Martinetti

TI__Guru 57800 points

Paolo,

When the AGC is enabled, any change on the ADC volume gain does not affect the amplitude of the signal as the AGC controls both PGA and digital volume.

I will try to find time to replicate your register configuration on my end and see if there is some issue with your settings.

Best Regards,

-Diego Meléndez López
Audio Applications Engineer

0 Paolo Martinetti over 7 years ago in reply to Diego Melendez

Expert 2730 points

Hi Diego,

thanks you so much for your precious support.

Paolo

0 Paolo Martinetti over 7 years ago in reply to Diego Melendez

Expert 2730 points

Hi Diego,

I solved my problem: the target level was not set correctly

Thanks a lot

Best Regards,

Paolo

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TLV320AIC3204 AGC MAXIMUM GAIN