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LMH6525: How to set the oscillation frequency

Meiling Jin
Prodigy 150 points
Part Number: LMH6525

HELLOW

           In the datasheet, setting the oscillation frequency is done through resistors. We attempted to change the resistor, but the oscillation frequency remained unchanged at 62.5MHz. Why is this happening? Could you please help explain

Thank YOU

  • 0
    TI__Genius 16691 points

    Hello Meiling,

    I have few follow-up questions:

    1. Is the oscillator enabled during your testing?

    2. What external oscillator-setting resistors are you using in your circuit?

    3. Are you also setting the amplitude via external resistors?  Or only setting the frequency?  The frequency is set by external resistors on pin 12 (RFA) and pin 13 (RFB).

    4. Have you checked you are setting the correct resistor frequency (RF) pin?  If you set 'A' (pin 12) but expect to see a change in 'B' (pin 13), you may not observe a change.

    Best,

    Alec