HMC531 operating temperature

Question

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?

MRichardson · Accepted Answer

Disabling Vcc1 will not impact performance at RFOUT or RFOUT/2 ports. Even with Vcc1 disabled the device will dissipate about 1W. There are a lot of factors with respect to a printed circuit board and its layout that can impact the dissipation of this heat. To be safe, I recommend that you consider mounting the board to a heat sink to minimize the thermal rise on the HMC531.)

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HMC531 operating temperature