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38Khz tone using the ADSP-21489

Hello, 

for an FM pre-modulator I need to generate a 38Khz tone using the ADSP-21489 (Ez-kit lite) and Sigma Studio 3.12.

The maximum output frequency seems to be limited to 24Khz at the AD1939 DAC's output, also changing the Sample Rate of each block of the circuit. I've attached a very simple project to show the problem: also changing the sample rate to 96KHz the output on the CH0 channel do not exeed the 24Khz. Can someone help me?
 
Thanks and regards.

attachments.zip
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