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CC1125EM-169-RD: Avvd_guard or VDD_GUARD.

Part Number: CC1125EM-169-RD

The CC1125 169 dev schematic has pin 1 as Avdd_guard.  The CC1125 datasheet shows pin 1 as  VDD_GUARD. ?    Assume this connects to a conductive ring on silicon around either digital or analog portion of chip?  Can not find but would love to have more information on all internal supplies etc in attempt to eek out every last drop of performance... ?

  • As the name suggest this power is connected to an internal guard ring. We don't share details about how the chip is designed. Following the reference designs should give the best performance possible.
  • May you at least clear up the discrepancy between the CC1125 data sheet and the CC1125 169mhz reference design schematic? Is it VDD_GUARD (data sheet claim) or is it AVDD_GUARD (ref design schematic claim) ? This portion of my original question(s) was not asking for chip design, it is only asking for clarification of public information. Thank you in advance.
  • The datasheet is always correct when it comes to pin out.

    This is a minor difference since:
    - Both the datasheet and the reference design show the same connection to the pin
    - AVDD is typically used as a name for a supply that goes to the analog part of the circuit. VDD is a generic supply name. In both cases the name indicate that the pin shall be connected to supply.
  • Yes, well aware there are separate (not internally connected to each other) power feeds to 6 analog circuits and 2 to digital. All this for separate bypassing and to decouple noise from one another. Was just trying to figure out how this guard pin fit into the picture. Otherwise I would have just gone with the ref design and never asked the question. Over and out. Thought dropped.