TLV320AIC3107: TLV320AIC3107 playback noise issue

Hi Neethu,

Registers 8 and 9 are the ones that control I2S interface. BCLK and WCLK should be outputs since you intend to use master mode, correct? Also confirm you have the right word length (16bit) in I2S mode. 

Can you share a schematic and some waveforms of your clocks/data? Is there anyway to measure the noise performance coming out of the microcontroller before the codec?

Best regards,

Jeff

Hi Jeff,

Thank you for your response.

In our case controller is the master and codec is the slave.When we tried to play speech , audio was clean only.But when we tried to play sine tones ,noise is there.our register configurations is as follows.

register:data 

 0x07 0x80
 0x07 0x0A
 0x03 0x91
 0x04 0x40
 0x66 0x00
 0x0a 0x00
 0x09 0x00
 0x25 0xc0
 0x29 0x02
 0x2b 0x00
 0x52 0x80
 0x5c 0x80
 0x4b 0x80
 0x4e 0x80
 0x56 0x09
 0x5d 0x09
 0x4f 0x09

I will share the waveform and schematics

Hi Neethu,

Are you measuring the noise with an FFT, or is it just that the noise can't be heard with speech data?

I looked through your registers and noticed you are writing to 4f, 4b, and 4e, which are listed as reserved in the datasheet. What is the goal of writing over those?

Best regards,

Jeff

Hi Jeff,

I am not checking the  Noise with FFT. Writing reserved registers was my mistake.We are planning to test with another audio codec in the same series.ie TLV320AIC3100 with MCU. For this codec what all configurations are needed.Do you have any controller compatible driver for this audio codec?

Hi Neethu,

We only have the drivers available on the product page, which are the linux drivers. The EVM user guide will help you set up the EVM. From there the registers need to be set accordingly to how you want the MCU to interface with the device. For example if the MCU is the master of the system, then the codec should be in slave mode, etc.

Best regards,

Jeff

Hi Jeff,

Thank you for the response.I have one more doubt .In my case controller is the master and I want to set audio codec in 16KHz ,16bit mono mode.in datasheet it is mentioned that audio codec is 24bit But I have seen there is a provision to set 16 bit via register.I just want to double confirm on the same.is there any limitations to set the codec in 16khz ,16bit mono?

Hi Jeff ,

Thank you Jeff,I will check and get back to you

Ok Neethu,

Reply back once you have an update.

Thank you,

Jeff