I need a controllable frequency for use in a radio transceiver with a range of 3–50MHz (i.e., 80m–6m). The frequency needs to be selectable using a microcontroller. Because chips like the Si5351 tend to give birdies, I want to use a DDS. However, that would mean a >100MHz crystal oscillator since as far as I know all DDS chips require an at least twice faster input signal. It's not so easy to get a >100MHz crystal oscillator, and I want to use common parts as much as possible.
Would it be feasible to use a lower frequency crystal oscillator and a PLL to scale it up? Specifically, I'm thinking about the ADF4002 PLL with the AD9913 DDS. Or are there other options that I'm missing?