ADRF5024 SWITCH NOT SWITCHING TO ONE PORT TO ANOTHER

It seems there's no issue with supply sequencing and no AMR value is violated with CTRL and supply pins.

The failures may be due to excessive RF power. Recommended power level for RFC is 27 dBm and 26 dBm if the input is at RF1 / RF2. What's the max. RF power level you work? Also verify you're not applying RF power to an unselected RF pin. 

Hello Yus,

Our RF power input level is much lower than 27 dBm, I would say below 0 dBm. We are also sure that there is no RF power to other pins.
However, we are still having this problem.

Best Regards
Adem

Hello Yus,

I noticed a missing part in my answer.
Yes, we do not apply RF power to a non-working port and the maximum RF power that will come to that port is also below 0 dBm.
I request your quick feedback in order to operate this circuit, which we urgently need, as we want.
Best Regards,
Adem

It seems RF power level is low enough to be a concern. 
I suggest probing Vdd, Vss and Control signals near IC pins with an oscilloscope in order to make sure there's no AMR violation due to ringing or any other system related problem. Please make sure you don't apply control signal when Vdd and Vss of ADRF5024 are off. I also suggest checking Vdd and Vss power up timings with an oscilloscope probing. Please make sure Vdd is turning on before Vss.

I'd like to remind ADRF5024's RF lines are dc-coupled to 0 V and no DC value other than 0V is recommended. You would need a DC blocking capacitor in case the RF line potential is not 0V.

Hello Yus,

I checked the VDD, VSS and CTRL pins with an oscilloscope. VSS comes after VDD and the signal levels are normal.
I also checked the RF lines and verified that there is no DC value and there is no DC signal along the line.
Control signals come after the supply voltages.
4 ICs have already become unusable. Do you have any idea where the problem is caused so that other integrations do not fail?
Thank you in advance for your support
Best Regards
Adem

ADRF5024s were able to switch RF1 and to RF2 before failure at least few times, am I right? What's average failure time or switching count, can you give an approximate number?

"When we switch the CTRL signal to the high position (+3.3V), it switches to RF1, but when we pull it to the low position (0V), it does not switch to RF2 and behaves like in isolation."

Regarding your explanation above: Do both RF1 and RF2 stay in isolation state when you apply logic low and expect to select RF2? Or RF1 is stayed selected (insertion loss mode, showing expected loss)? 

We hope to localize the electrically stressed location in principle. Can you measure RF pin resistance of the failed units. RFC should be around 16k and RF1/2 should be around 3.4k? The expected resistance for the other pins as follows: VSS ~18k, VDD~350k and CTRL >1 Mohm.

Can you measure the VDD, VSS and CTRL pin currents of the failed units? It can be hard to measure this if ADRF5024 share voltage rail with other components. The most convenient way is to utilize the evaluation board if you have it already.

Hello Yus,

The opening of ADRF5024 VDD, Voltage level Translator VDD and ADRF5024 VSS voltages are as in the image. As you can see in the image, VDD voltages come first. Control signals are given after the system is completed.
I will make the measurements you mentioned in your comment today and send them to you.
Best Regards
Adem

Hello Yus,

I can answer your first question by adding this to my comment.
When I apply logic low, the RF1 port is stuck, while the RF2 port behaves like it is in isolation.
When we apply Force 0V from outside, it is short-circuited with +3.3V.

Best Regards,

Adem