DA7212 system clock range

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Last post
Wed, 2018-07-25 21:53
#1
pawelp28
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DA7212 system clock range

Hello,

I would like some clarification on the DA7212 System Clock. From the datasheet it seems that we can provide the codec with frequencies 2-50MHz. However the Beep Generator section (13.9) talks about 12.288MHz and 11.288MHz. If we provide MCLK of 4MHz will the beep generator still work?

Also if we us the codec for analog paths only (no I2S digital interface) do we need to provide an MCLK? Same question for beep generator, does MCLK need to be provided?

thanks!

Device:
DA14580
星期四,2018-07-26 09:23
ED_Dialog
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加入:2017-09-18 11:54
Hello Pawelp28,

Hello Pawelp28,

  • 锁相环可以通用nerate the 12.288 MHz from the incoming 4Mhz clock, so the 4MHz clock should be ok.
  • So if you use the Audio codec for analog paths only, then you do not need the MCLK. However if you are using tthe DAC or ADC without I2C then make sure PC_COUNT register 0x94 is set to FREERUN (0x01).
  • The beep generator will generate a beep without MCLK, but the frequency will not be correct and can vary up to 50% accross different tempertures.

Kind regards,
Elliott Dexter

Accepted answer
Mon, 2018-07-30 17:47
pawelp28
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Thank you!

Thank you!