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AGND and DGND Issue in DDS Chip - AD9951

Question asked by MohitH on Jul 24, 2013
Latest reply on Jul 26, 2013 by MohitH

Hi,

 

I have recently procured 2 Qty. AD9951 - DDS Chips.

 

When I test the chip separately (Dis-connected from the PCB), I find that pin5.0 and pin7.0 i.e. AGND are not showing short

but a resistance of 100 ohm within them. Again DGND pin3.0 and AGND pad at the bottom shows a resistance of 72 ohms

approximately.

 

I have not powered on the chip yet but i want to know whether is this normal behavior or characteristics of the chip.

 

Please reply urgently as we are stuck in our development due to this strange behavior.

 

Thanks all...

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