• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 21 subscribers
  • Views 82 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LMK04832-SEP: Is it necessary to power any of the power pins w/ an LDO?

Lauren Mayfield
Expert 7935 points
Part Number: LMK04832-SEP
Other Parts Discussed in Thread: TIDA-010274, TIDA-010260, , LMX2694-SEP

Tool/software:

In the TIDA010260 it does not use an LDO to power the LMKx, however TIDA-010274 does. It does not specify on the datasheet but given some inconsistencies between reference designs I wanted to be sure.

  • 0
    TI__Mastermind 33790 points

    The LMK04832-SEP (and the LMX2694-SEP) can be operated from switching supplies. Whether or not this is a good idea is application-dependent. The plots in section 3.6 of the TIDA-010260 design report show enormous 1MHz spurs from the DC-DC converters, which no doubt include some spurs coupled in from the clocking ICs. But if these spurs are already anticipated from other AFE rails, or the clock IC contributions are small enough that other sources are dominant, or if the application signal processing can arrange for filtering or ignoring the DC-DC spurs, using DC-DC converters may be a useful optimization.