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How to generate 40KHz signal using ADAU1401A?

Question asked by Shu on Dec 7, 2016
Latest reply on Dec 8, 2016 by Shu

Dear all,

 

My project need to work at 40KHz. I am trying to use a simple test circuit to get a 40KHz sinusoidal wave first. I connect a source to the output directly. I set the sample rate to 96KHz. However, the highest frequency i can get is around 20KHz. After I set the sample rate to 192KHz, the highest frequency is about 22KHz. The PLL_MODE0 is 0 and PLL_MODE1 is 1.

 

The figure 8, 9, and 10 in the datasheet show there is a filter to stop the signal at 22KHz. But I believe it should work for 40KHz signal under the 96KHz and 192KHz sample rate.

 

Could you please tell me how to get high frequency using ADAU1401A?

 

Thanks,

Shu

 

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