I just bought a couple of these and they seem to do the trick. I've only tested them to 100 kHz because that far exceeds my needs but the output is at the expected frequency and reasonably clean (although additional high frequency filtering my be a good idea).
Controlling the module is simple. I'm using the serial interface. Shift out 32 bits for the frequency, 8 bits for phase modulation and control (%00000000 is probably the right answer) and strobe the FQ_UL pin.
I couldn't find a schematic anyplace for these, but ebay seller "nooelec" does have a pinout diagram...and stock in the US/Canada.