to generate 470 - 480 Khz
I think this thread might help you.
You can use aduc848 for a quick setup. Aside from that, it is powered by 3.3 V which is compatible with AD9834 if you wanted low voltage operation.
Literally any MCU you feel comfortable with. One with SPI bus would be cool, but even that is not required (as you can just bit-bang the registry info). You should pick one that runs at the same voltage as Louijie suggested (to avoid level translators).
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