Yes, the SX2 can be used to clock your external device. Here is how you set this up:
IFCONFIG bit 7 (IFCLKSRC) = 1 to tell the SX2 to use the internal clock
IFCONFIG bit 6 (3048MHZ) = 0 for 30MHz output or 1 for 48MHz output.
IFCONFIG bit 5 (IFCLKOE) = 1 to enable the IFCLK output pin.