TAS5825PEVM: TAS5825P

Hi Ti Team，

When music is playing, I can hear the music, but the speaker makes an intermittent hiss (which is louder than the music).
When the music stopped, so did the sizzling sounds.
Do you know why? Please give suggestions for troubleshooting.

Best Regards,

Dingxin.Jin

Kailyn Chen：

Hello， do you use the TAS5825PEVM board or your own board?

If your own board, please attach your schematic,  adding  0.1uF decoupling caps to GND  close to all the AVCC pins  and also adding a 0.1uF decoupling cap on the input pin to check if it could improve for the sizzling.

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?? ?：

thank you.

I am using TI’s demo board, TAS5825PEVM.

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?? ?：

Hello, I feel the description is not clear enough

The audio file I played is shown below

Then, I used my mobile phone to record the sound played from the speaker, as shown in the picture below:

I found that the noise is particularly obvious.

The speaker is 8Ω, 2W.

Do you have any suggestions for using the TAS5825PEVM demo board?

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Kailyn Chen：

Could you please check the PVDD? It should not be the problem of the EVM board.

Except the PVDD, I also advise to check the input signa if it has coupled some noise to cause the sizzling.

In addition,  when recording, please try a  lowering the gain setting  and  step it up in small increments.

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?? ?：

Hi Kailyn,

I am using the Battery on the TAS5825PEVM for power supply (5V) and do not use PVDD.Does this situation have anything to do with register configuration? If it matters, please tell me which registers I should register.

Best Regards,

Dingxin.Jin

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Kailyn Chen：

Have you requested the PPC3 software in convenience to help configuration?

As to the noise, we should first to decide the where is the noise from, input signal, clock input or power supply or any other operation.

If the SCLK, BCK, LRCK are the correct the timing and frequency relationship? 

In addition, about the record noise, if the board is closer to the phone and record it? 

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?? ?：

I requested PPC3 software, but it was rejected. TI replied that it was due to trade regulations. Can you help with this?

I don't know much about hardware and I'm not sure where the noise comes from. What I want to determine now is whether there is a problem with the register configuration?

The timing and frequency relationships of SCLK, BCK, and LRCK are correct.

Now the board is very close to the mobile phone, and then the recording is recorded. When playing audio, noise can be heard. I compared and analyzed the spectrum of the recording file and the spectrum of the audio file, and found that the newly added frequency components in the recording file were concentrated in 0Hz~200HZ.

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Kailyn Chen：

?? ? said:I requested PPC3 software, but it was rejected. TI replied that it was due to trade regulations. Can you help with this?

I am sorry that I have no idea about it. 

?? ? said:What I want to determine now is whether there is a problem with the register configuration?

What is your configuration? You could attach it for reference.

Or change the gain to try if decrease the gain would improve? 

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?? ?：

Thank you.

Lower the analog gain and the effect will improve and the noise will become smaller, but still present.

{ 0x00, 0x00 },{ 0x7f, 0x00 }, // Go to Book 0, Page 0{ 0x03, 0x02 }, // HI-Z{ 0x01, 0x11 }, // Reset Control Port Registers and Full Digital Core{ 0x00, 0x00 },{ 0x7f, 0x00 }, // Go to Book 0, Page 0{ 0x03, 0x02 }, // HI-Z

{ 0x00, 0x00 },{ 0x7f, 0x00 }, // Go to Book 0, Page 0{ 0x03, 0x00 }, // Deep Sleep{ 0x00, 0x00 },{ 0x7f, 0x00 }, // Go to Book 0, Page 0{ 0x46, 0x01 }, // 96kHz process flow

{ 0x00, 0x00 },{ 0x7f, 0x00 }, // Go to Book 0, Page 0{ 0x03, 0x02 }, // HI-Z{ 0x00, 0x00 },{ 0x7f, 0x00 },{ 0x78, 0x80 }, // Fault clear (Not required, but recommended)

{ 0x00, 0x00 },{ 0x7f, 0x00 }, // Go to Book 0, Page 0{ 0x60, 0x07 }, { 0x61, 0x0b },{ 0x62, 0x09 },{ 0x63, 0x08 },

{ 0x00, 0x00 }, // Go to Page 0{ 0x4e, 0xbb },{ 0x4f, 0xb0 },{ 0x02, 0x00 }, // BD, 384k BTL{ 0x53, 0x00 }, // BW: 100k{ 0x54, 0x1e }, // Amp Peak Output Voltage: 4.95V{ 0x6B, 0x03 }, // Spread Spectrum: Triangle SS Enabled{ 0x6C, 0x03 }, // Spread Spectrum: 24k, 25%, No Random/Dither{ 0x6D, 0x50 }, // Spread Spectrum: Ensure Value is 0x50

{ 0x33, 0x17 }, // 32-bit TDM word{ 0x3a, 0xf8 }, // DRBOOST Disabled{ 0x50, 0x00 }, // Automute Disabled{ 0x5f, 0x1e }, // Analog Gain Ramp

{ 0x00, 0x00 },{ 0x7f, 0x00 }, // Go to Book 0,Page 0{ 0x66, 0x87 }, // bypass DRC, EQ, 128 Tap FIR

{ 0x00, 0x00 },{ 0x7f, 0x8c },{ 0x00, 0x0b }, // Book 8C Page 0B{ 0x14, 0x00 }, // Input mixer set to left channel only{ 0x15, 0x80 },{ 0x16, 0x00 },{ 0x17, 0x00 },{ 0x18, 0x00 },{ 0x19, 0x00 },{ 0x1a, 0x00 },{ 0x1b, 0x00 },{ 0x1c, 0x00 },{ 0x1d, 0x00 },{ 0x1e, 0x00 },{ 0x1f, 0x00 },{ 0x20, 0x00 },{ 0x21, 0x80 },{ 0x22, 0x00 },{ 0x23, 0x00 },{ 0x0c, 0x00 }, // volume control –Attenuation 40dB{ 0x0d, 0x01 },{ 0x0e, 0x47 },{ 0x0f, 0xae },{ 0x10, 0x00 },{ 0x11, 0x01 },{ 0x12, 0x47 },{ 0x13, 0xae },

{ 0x00, 0x00 },{ 0x7f, 0x8c }, // Book 8C Page 01{ 0x00, 0x01 }, // Volume Time constant{ 0x2c, 0x00 }, { 0x2d, 0x71 },{ 0x2e, 0x94 },{ 0x2f, 0x9a },

{ 0x00, 0x00 },{ 0x7f, 0x8c }, // Book 8C, page 0B{ 0x00, 0x0b }, // AGL Section{ 0x58, 0x00 }, { 0x59, 0x00 },{ 0x5a, 0x57 },{ 0x5b, 0x62 },{ 0x4c, 0x00 },{ 0x4d, 0xcd },{ 0x4e, 0x7b },{ 0x4f, 0x90 },

{ 0x00, 0x00 },{ 0x7f, 0x8c }, // Book 8C, page 0A{ 0x00, 0x0a }, // Attack Threshold{ 0x34, 0x05 }, { 0x35, 0xb7 },{ 0x36, 0xb1 },{ 0x37, 0x5b },

{ 0x00, 0x00 },{ 0x7f, 0x8c }, // Book 8C, page 01{ 0x00, 0x01 }, // AGL Enable{ 0x28, 0x40 },{ 0x29, 0x00 },{ 0x2a, 0x00 },{ 0x2b, 0x00 },

{ 0x00, 0x00 },{ 0x7f, 0x8c }, // Book 8C, page 0B{ 0x00, 0x0b }, // Softening Filter Alpha{ 0x48, 0x08 }, { 0x49, 0x96 },{ 0x4a, 0x57 },{ 0x4b, 0x44 },

{ 0x00, 0x00 },{ 0x7f, 0x8c }, // Book 8C, page 0B{ 0x00, 0x0b }, // Softening Filter Omega{ 0x54, 0x77 }, { 0x55, 0x69 },{ 0x56, 0xa8 },{ 0x57, 0xbc },

{ 0x00, 0x00 },{ 0x7f, 0x00 }, { 0x30, 0x00 }, { 0x4c, 0x30 },{ 0x03, 0x08 },

// WARNING: nothing should be after this except clearing faults{ 0x00, 0x00 }, // Go to Book 0, Page 0{ 0x7f, 0x00 },{ 0x78, 0x80 }, // Clear faults

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Kailyn Chen：

Hello， I  would confirm with our senior engineer about this question and reply you as soon as possible.

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?? ?：

Thank you, looking forward to your good news.

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Kailyn Chen：

I would reply you as soon as possible.

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Kailyn Chen：

Hello， about this question, I receiver the below reply :

1.can you use AP or oscilloscope to observe what kind of electronic signal is outputted ? also playing some simple signal like sine wave. The figure you shared is hard to see which is audio which is noise.

2.can you share the ppc3 file, that will be much easier for us to understanding what be set in the amp.

3.have customer tried our evm board? that might be easier to find out whether it is config problem or hardware problem.

I would explain to engineer about the question 2 and 3 .