TLV320AIC3204 - ADC "white noise"

Shlomi Yehezkia

Other Parts Discussed in Thread: TLV320AIC3204

Fullscreen 8171.Register Settings.txt Download

  //Page 0

  I2Cwrite(CODEC_ADDR,0x00,0x00);

  I2Cwrite(CODEC_ADDR,0x02,0x60);

  I2Cwrite(CODEC_ADDR,0x04,0x07);

  I2Cwrite(CODEC_ADDR,0x05,0x91);

  I2Cwrite(CODEC_ADDR,0x06,0x08);

  I2Cwrite(CODEC_ADDR,0x12,0x81);

  I2Cwrite(CODEC_ADDR,0x13,0x81);

  I2Cwrite(CODEC_ADDR,0x24,0x44);

  I2Cwrite(CODEC_ADDR,0x51,0xC0);

  I2Cwrite(CODEC_ADDR,0x52,0x00);

 

  //Page1

  I2Cwrite(CODEC_ADDR,0x00,0x01);

  I2Cwrite(CODEC_ADDR,0x01,0x08);

  I2Cwrite(CODEC_ADDR,0x02,0x01);

  I2Cwrite(CODEC_ADDR,0x33,0x40);

 

  //Inputs configuration for single end

  I2Cwrite(CODEC_ADDR,0x34,0x10);//left

  I2Cwrite(CODEC_ADDR,0x36,0x01);//left

 

  if (CodecRegConfig.NumInput==STEREO)

  {

    I2Cwrite(CODEC_ADDR,0x37,0x40);//right

    I2Cwrite(CODEC_ADDR,0x39,0x40);//right

    I2Cwrite(CODEC_ADDR,0x3C,(char)(CodecRegConfig.InputGain/1.25)); //MIC PGA Right:

  }

 

  //Mic PGA: Calc : CodecRegConfig.InputGain (from 0 to 100) / 1.25 = Gain value (Real gain is Gain value/2!)

  I2Cwrite(CODEC_ADDR,0x3B,(char)(CodecRegConfig.InputGain/1.25)); //MIC PGA Left: 0x06 = 3dB, 0x0A = 5dB, 0x28 = 20dB, 0x3C = 30dB, 0x50 = 40dB

 I2Cwrite(CODEC_ADDR,0x3E,0x02);

  I2Cwrite(CODEC_ADDR,0x47,0x32);

  I2Cwrite(CODEC_ADDR,0x7B,0x01);

Hi Team,

My customer platform based on TLV320AIC3204 codec.

It is working correctly but there is ADC "white noise" problem they unable to resolve.

Tried AGC but could not find optimized register settings based on system MIC & HW.

Please find enclosed:

PCB schematics – codec part
Register settings
Audio example attached ( used 12db gain , Reg 0x3C, 0x3B)

BCLK = 256K.

They using codec internal PLL (External MCLK not ued) to generate CODEC_CLKIN = 2.048Mhz.

They using the attached MIC

http://www.puiaudio.com/pdf/TOM-1545P-R.pdf

Can you help?

Thanks,

Shlomi

over 12 years ago

0 Don Dapkus over 12 years ago

TI__Guru**** 189401 points

Hi, Shlomi,

Sorry for the delay. I have highlighted your post to my colleague to answer.

-d2

0 J- over 12 years ago

TI__Mastermind 46195 points

Shlomi,

Schematic and mic look good. Could you ask the customer to put comments on the code for each register to understand what they are trying to do?

Thanks,

J-

0 Shlomi Yehezkia over 12 years ago in reply to J-

Mastermind 6150 points

Hi J,

This is the latest AGC settings we use, but it is still not good enough,

// AGC

// I2Cwrite(CODEC_ADDR,0x0B,0x81);

// I2Cwrite(CODEC_ADDR,0x0C,0x82);

// I2Cwrite(CODEC_ADDR,0x56,0xA2);

// I2Cwrite(CODEC_ADDR,0x57,0x92);

// I2Cwrite(CODEC_ADDR,0x58,0x2E);

// I2Cwrite(CODEC_ADDR,0x59,0x28); // Left Channel AGC Attack Time

// I2Cwrite(CODEC_ADDR,0x5A,0x15); // Left Channel AGC Decay Time

// I2Cwrite(CODEC_ADDR,0x5B,0x0B); //noise debounce 92msec

// I2Cwrite(CODEC_ADDR,0x5C,0x03); //Signal debounce

We simply could not find the best register settings of Attack/Decay/Target/threshold settings with MIC used (http://www.puiaudio.com/pdf/TOM-1545P-R.pdf)

Used AGC example from http://www.ti.com/lit/an/slaa446/slaa446.pdf , but got distorted audio.

Can you provide recommended AGC register settings for 45 db sensitivity MIC ?

Thanks,

Shlomi

0 J- over 12 years ago in reply to Shlomi Yehezkia

TI__Mastermind 46195 points

Shlomi,

This seems to be related to http://e2e.ti.com/support/data_converters/audio_converters/f/64/p/67083/933307.aspx#933307.

Regards,

J-

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TLV320AIC3204 - ADC "white noise"