Dear expert,
My customer is evaluating the DAC3482. They found that the bit 5 of reg 0x05 is always 1 during the operation which means that the PLL is lost lock. I checked the datasheet and it said as below. Is this a reasonable explanation for this issue? I wonder what's the meaning of the "version ID 100b or earlier" . How can we know the version ID of the DAC3482?
Best regard,
Wayne
Hello Wayne,
The alarm_from_pll is a analog PFD detector to detect the current drift between the up/down current of the PFD to determine PLL lock. There should be some standard textbook that talks about the implementation and the potential leakage current affecting the accuracy The DAC348x family of silicons has some problem with this specific lock detector and we have decided to not recommend this to customer usage.
Version ID is read back from 0x7F register. Basically, the production version and earlier beta version of silicons have this problem. This is why we cannot recommend using this lock detector
some reference from wikipedia
-Kang
