I'm designing a PLL to synthesize 50 MHz to 800 MHz.
So, I need division ratio of 16 for simple design.
When the spurs are considered, which one is better between an external prescaler and internal prescaler?
Choice of prescaler doesn't usually affect performance. Internal is generally easier to work with.I would encourage you to consider the ADF4150HV, which can tune a wideband VCO without an external Op-AMP, or an ADF4351 which covers the range you requested on one chip.
This specification may be part dependent. If you provide a part that you have an interest in, we can hopefully respond with a recommendation.
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