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HMC830 LD_SDO

Question asked by IHPGY on May 5, 2015
Latest reply on May 7, 2015 by IHPGY

Hello, I encounter a problem with the output voltage of HMC830 LD_SDO pin. The output  voltage drops to 0.7V or 2.0v or other else between them after the device works for sometime. The output signal retains locked and eventhough the REG 0Fh is written 0000A0, the output voltage stays low. The device was working normal but lockdetect signal is missing. I have put a 1k resistor in series with the LD_SDO pin and the load of LD_SDO is about 4.7kΩ. The proportion of bad device is about 20%. I want to know how to protect this pin to prevent it to be disworked.

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