MK22FN128 I2S clock mismatch for 44100/48000Hz

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MK22FN128 I2S clock mismatch for 44100/48000Hz

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molave20a
Contributor I

Hi:

   Can anyone tell me the clock mismatch value between i2s  target FS (44100/48000) and real FS ? Because i'm gonna to move my project from STM32F401 to MK22FN128 .

   The picture attached is from STM32F401.

   Thanks!!!

QQ截图20170221213528.png

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Hui_Ma
NXP TechSupport
NXP TechSupport

Hi

Below picture list K22 I2S/SAI module clock source:

pastedImage_1.png

The MCLK could from MCG PLL clock or external input clock.

About MCLK frequency precision is based on clock source, customer could find the MCG PLL clock jitter info from K22 datasheet Table 16. MCG specifications:

pastedImage_2.png

If MCLK clock source from external oscillator, it need to check with external oscillator datasheet about clock accuracy data.


Wish it helps.

Have a great day,
Ma Hui
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