Hello, I have some questions about AD9516-3.
When using an external VCO, how the LF pin should be ? Should the LF pin be connected to VS, GND or others ?
And could you tell me other attention when using an external VCO ?
The LF pin can be left floating when using an external VCO. One thing to keep in mind is that the gain of the VCO chosen (Kvco) scales the loop bandwidth. If you are planning to create a low PLL loop bandwidth to attenuate reference noise, a VCO with a smaller frequency tuning range (lower Kvco) is ideal.
You will also want to make sure that you choose a VCO with a level that is accepted by the AD9516 (3.3V CMOS, LVDS, LVPECL are all fine). Feel free to let me know if you have any further questions.
Thank you for your quick response.
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