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What is the status of the LOCK_DETECT pin when the TRF3761 CHIP_ENABLE is low?

Roland Sperlich
Prodigy 90 points

Hello,

What is the status of the LOCK_DETECT pin when the TRF3761 CHIP_ENABLE is low (OFF)?

Thanks. 

  • 0
    TI__Prodigy 90 points

    Hello,

    It looks like the lock-detect circuit is also disabled when the CHIP_EN (pin 2) is disabled (low) – this in turn will cause unstable behavior on the MUX_OUT pin (pin 39).

    The MUX_OUT pin is configured according to page 40 of the datasheet, and often used as a lock-detect indicator.

    There is no difference in the digital lock detect behavior versus the analog lock detect, we tested this on the EVM and the behavior remained inconsistent when the part is disabled. 

    Thanks!