LMX2594EVM: LMX2594EVM Information

Hi Kaustubh,
I am sure if the customer ever read the datasheet and the EVM user's guide, he should be able to find most of the answers.
I would like to take question 5, which is an interesting question. The duty cycle is not configurable.

Dear Noel,

Many thanks for your answer to question 5. However, I can assure you I have read the user manual and that the questions I ask are not obviously answered therein.

Could we possibly arrange a call to discuss?

Best wishes,

Dr M. J. Applegate

Dr. Applegate,
Let me respond to a few more:

1. How easy is it to get up and running with the kit and the software? Can you provide any training?
-> It is quite easy and the TICSPro software is easy to use. You can download and test it without the EVM. We don't have any additional training except for the datasheet, EVM instructions, and TICSPro software.

2. What is the form of the output (Is it a square wave, a sine wave or other)?
-> This is open collector. At higher frequencies, it looks more like a square wave at lower frequencies and a clipped sine wave or pure sine wave at igher frequencies.

3. Can the phase of the output be varied, and if so what is the smallest amount by which it can be adjusted?
-> Yes it can be varied and the amount is far finer than you would ever need. This amount is the output period divided by the fractional denominator (which is huge). So << 1 ps.

4. Can the amplitude of the output be varied, and if so what is the smallest amount by which it can be adjusted?
-> Yes, this can be varied by changing OUTA_PWR and OUTB_PWR. The size of the steps vary, but something on the order of 0.5 dB per step.

5. Can the duty cycle of the output be varied, and if so what is the smallest amount by which it can be adjusted?
-> No, this can not.

6. Is a signal strength of 200 mV peak-to-peak (-10dBm) acceptable for the external reference signal?
-> No. This violates our minimum input spec. The part would probably lock to this, but he spurs and phase noise would be bad and we would not guarantee that it would lock.

7. What other requirements on the external reference signal are there?
-> It should be clean as this noise goes straight to the output.

8. Depopulation of board for single-ended signal?
For this, disconnect the power to the XO and switch the input to go to the OSCinP SMA. We have a 100 ohm differential resistor. Remove this and put 50 ohm to ground instead.


9. How to use differential pair?
For this, disconnect the power to the XO, switch the resistor to allow signal to OSCinP and drive OSCinP and OSCinM.

Could anyone help me this please?