SNAS605AS March 2013 – May 2020 LMK04821 , LMK04826 , LMK04828
PRODUCTION DATA.
CLKin2 may instead be configured as OSCout, which by default is a buffered copy of the PLL1 feedback/PLL2 reference input (OSCin). This reference input is typically a low-noise VCXO or crystal. When using a VCXO, this output can be used to clock external devices such as microcontrollers, FPGAs, and CPLDs, before the LMK0482x is programmed.
The OSCout buffer output type is programmable to LVDS, LVPECL, or LVCMOS. OSCout LVPECL mode only supports 240-Ω emitter resistors.
The VCXO/crystal buffered output can be synchronized to the VCO clock distribution outputs by using cascaded zero-delay mode. The buffered output of VCXO/crystal has a deterministic phase relationship with CLKin.