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AWR2243: unused LO input pins

Jason Lo
Prodigy 250 points
Part Number: AWR2243
Question:  Will the AWR2243P function properly in a single-chip configuration if pin B1 is grounded and pin D15 is open (unconnected)?
The AWR2243P has two possible inputs for 20 GHz LO input (pins B1 and D15).  In our custom application, the PCB has a single AWR2243P chip (no cascading):
  • B1 is directly connected to ground. 
  • D15 is routed to an RF connector.
The reason we have D15 routed out is that we eventually want to take some measurements at this pin.  However, the PCB and AWR2243P still needs to operate normally when no measurement equipment is attached to the connector at D15.
  • 0
    TI__Genius 13805 points

    Hi,

               You can refer the Design Guides on below links for more details.

    1. Single Chip Configuration Schematic Checklist: https://www.ti.com/lit/zip/swrr152

    2. Cascade Design Guide : https://www.ti.com/lit/zip/sprr407

    If the pins are not used/not connected they can always be disabled internally from registers.

    Regards

  • 0 in reply to Abhed Misra
    Prodigy 250 points

    Hi Abhed,

    I reviewed SWRR152 and SPRR407 previously.  For single-chip case, SWRR152 states that B1 and D15 should be grounded, while SPRR407 suggests that unused pins can be left floating an disabled internally via API.  Reviewing the "mmWave Radar Interface Control Document (Revision 2.19)," I did not see any API that specifically disables the FMCW_SYNCIN1 and FMCW_SYNCIN2 pins.

    I am thinking that FMCW_SYNCIN and FMCW_SYNCOUT pins are automatically disabled when device is configured for single-chip operation.  However, I would like verification that my setup described in original post is valid.

    Thanks.