AD9520-0 heating up and output frequency gradually decreases.


I am using AD9520-0 clock generator. I am using it to supply frequency to 8 DDS(AD9959) chips.I am using it in Mode 1(Clk distribution without PLL).

I am using 24Mhz crystal oscillator connected to Refin and RefinB. Initially the frequency at OUT0 to OUT7 are at X hertz, and after few seconds the frequency is reducing at 100kHz/sec..What is the cause for this? Is there any way to lock the output frequency to fixed frequency. The IC heats up, cant even touch with bare hands but still gives output.

Thank you in advance.

Prakash BJ

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