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ADF4113HV PLL fail problem?

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HamtaroRF

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Dear ,,,
I have tried the PLL ADF4113HV from the analog device to control a wideband VCO about 1 octave(VCC=12volt, Vt=1-->14volt).
the PLL will lock for 1 min + or - and after a while it burn!!!.
I have tried many chips and the problem still exists!
I followed the data sheet carefuly , but the problem still exist , it seems to me that the chip still new , and I didn't find reviews !
Please if somebody know something about such failure .. let me know ..

thanks in advance
 

You might want to try to find out which part of the chip fails. I have had an issue with unexpected failures from ADF4213 chips and it turned out that, while I could program it via spi, drive the charge pump high/low and see the ref. divider output, the RF ports were mysteriously gone. I solved the problem by protecting the two RF inputs with antiparallel schottky diodes.
 

What color smoke?

You must either be overvoltaging one of the pins or have a short on your board. those things are pretty bulletproof.
 

If there is a voltage difference between AVdd and DVdd, or if these two pins are not well decoupled there is possibility to happen this.
 

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