Q: I would like to make a phase lock module that can rapidly switch between different frequencies using the MAX2871. I checked the data sheet, and it mentions that it has a built-in VCO including 64 sub-VCO, but the data sheet does not mention the frequency range of each VCO. If I manually select the VCO to speed up the lock time, is it possible to provide the appropriate parameters?
A: The VCO frequency range of MAX2871 differs depending on the different chips. We recommend you set the VAS ON first, read each frequency point of Register 6 and build a corresponding lookup table. Then, shut off the VAS and setup the VCO based on the lookup table.