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HMC531 operating temperature

We use HMC531. But the operating temperature of HMC531 will over 85deg when we turn on our system. IC is very hot.

What situation will cause the temperature to rise on HMC531?

If we don't need power output of RFOUT/4, about this pin, may I connect 50 ohms to the ground or let it open? 

Does it affect the IC's heat?