TAS5713: TAS5713 PLL error issue

Eric Lo72350

Intellectual 915 points

Part Number: TAS5713

My KMM customer use TAS5713 and meet the audio output is not stable. sometime is no output.

so they found the register 0x02(ERROR STATUS REGISTER)，value is 0x40 (PLL autolock error).

any comment for this issue?

Below is the schematic and I2S waveform.

5713.pdf

over 5 years ago

0 Matthew Miao over 5 years ago

TI__Expert 6720 points

Hi Eric,

TAS5713 needs to do 'Trim oscillator (write 0x00 to register 0x1B)' during start-up. Please help to check required start up sequency:

Rdgs,

Matthew

0 Eric Lo72350 over 5 years ago in reply to Matthew Miao

TI__Intellectual 915 points

Hi Matthew
yes, customer do 'Trim oscillator (write 0x00 to register 0x1B)' during start-up but issue still there.
Customer modify the register START/STOP PERIOD REGISTER (0x1A) from 0x0a to 0x15 then the issue was gone but the side effect is the output is delay about 4~5 seconds. original 0a is 2 seconds. any comment?

Eric Lo

0 Matthew Miao over 5 years ago in reply to Eric Lo72350

TI__Expert 6720 points

Hi Eric,

Just re-check the schematic. In order to make sure the signal integration of MCLK, could you remove parallel resistance 10k (PR3), which might produce unbalanced rise and fall times. We recommend adding 50ohm impedance matching resistance, and even RC （50ohm + 10pF).

The requirements of MCLK rise/fall time can be found at https://e2e.ti.com/support/audio/f/6/t/485790?tisearch=e2e-quicksearch&keymatch=TAS57*

Regarding the 0x1A register changing, could you help to provide the PWM waveform based on 0x15?

Rdgs,

Matthew

Audio

Audio forum

TAS5713: TAS5713 PLL error issue