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Behavior at high temperature about HMC7044

Category: Hardware
Product Number: HMC7044


I have a question about the high temperature for the HMC7044. 

When the surface temperature test on the IC, observed in which the temperature dropped sharply around 60 ° C.

Looking at the datasheet, I could not find any description about this.

Can you tell me the cause of this?

By the way, the PLL1 and PLL2 are locked from beginning to end.

Best regards.