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CC2652R7: CC2652R7 Load Impedance Requirement

ChingShiuan Tsai
Prodigy 40 points
Part Number: CC2652R7

Hi TI team,

According to Optimum Load Impedance in Chapter 9 of the "CC13xx/CC26xx Hardware Configuration and PCB Design Considerations" document, there are the following problems,

Does our circuit meet the conditions of differential internal bias? If yes, do we have to satisfy 42+j21 Ω while verifying the load impedance?
Where should it be verified from (1 or 2 or 3) in the circuit? Please refer to the attached file.

Please kindly share your suggestions, thanks a lot.

Best Regards,

ChingShiuan

  • +1
    TI__Mastermind 31330 points

    Hi,

    The load impedance that is specified is the balanced load impedance seen from the chip. i.e. this is the load that the chip wishes to see. So #1 in your figure.

    If you follow the standard reference design, then this requirement is normally met automatically.

    Your schematic is using internal bias since you have no connections to the TxRx line. If TxRx line was used, then it would be external bias. 

  • +1 in reply to RGW
    Prodigy 40 points

    Hi RGW,

    Thank you very much for your support.

    Best Regards,

    ChingShiuan