We are trying to cool down AD9361 with heat sink on the shield, because the AD9361 gets really hot when it is working, which is close to the max rating. But the test results with heat sink show the junction temperature of AD9361 read from the temperature sensor is about 107C, but the temperature of the surface of AD9361 is 53C, more than 50C difference. It looking using heat sink on top of the chip is not a good idea to cool the chip down. Is there any instructions about AD9361 thermal design? What is the best way to cool AD9361 down?