The si4734/4735 FM receiver has two options for clock input, one is to use the typical crystal oscillator (a crystal + pair of capacitors to ground), attached to the DCLK+RCLK pins, the other is to feed a "finished" clock source to just the RCLK pin. The first is the most common design, all the examples and app notes I saw use it. But this limits you to use its analog audio outputs, since for digital audio output the DCKL pin is needed.
Has anyone tried the second option? Any recommendations for a good (small+cheap) clock source circuit?