TLV320DAC3203: Using the internal Clock for PLL and DAC (Digital Microphone)

user5276363

Part Number: TLV320DAC3203

Hello there,

we're currently evaluating the mentioned codec. Our use case is to read from a digital microphone and direct the output to a speaker. This function works perfectly on the TLV320DAC3203EVM, but our target hardware will have no MCLK to provide to the codec. So we're trying to configure the codec to use the internal clock (BCLK?) to drive the PLL and therefore the microphone and DAC - but we're struggling at this point, as we're only seeing an output of 1 Hz from the BCLK pin.

Could you help us setting up the correct registers, so the TLV320 can run "standalone", without MCLK?

Thanks in advance,

Philipp

over 5 years ago

0 Ivan Salazar over 5 years ago

TI__Guru* 95455 points

Hi Philipp,

This device can use BCLK as input to PLL the same way it use MCLK. But either of these signals must be an input to the device, you cannot use BCLK as input to PLL if there is no external BCLK signal coming into the device.
Unfortunately this device does not have an internal oscillator to feed the PLL.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

0 user5276363 over 5 years ago in reply to Ivan Salazar

Intellectual 300 points

Hey Ivan,

thank you very much for your fast and clarifying response. Would it be possible to connect an external crystal (say 12 or 16 MHz) to MCLK or BCLK to operate the TLV320?

Thanks again,
Philipp

0 Ivan Salazar over 5 years ago in reply to user5276363

TI__Guru* 95455 points

Hi Philipp,

Yes, that is possible, I would recommend to connect the external crystal to MCLK so that you can generate BCLK internally if the device is used in Master mode.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

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TLV320DAC3203: Using the internal Clock for PLL and DAC (Digital Microphone)