The Texas Instruments LMK02000ISQX/NOPB is a clock conditioner with an integrated PLL, designed to clean up jitter on reference clocks and distribute low-phase-noise timing to multiple destinations. It accepts LVCMOS, LVDS, or LVPECL inputs and provides eight differential LVDS or LVPECL outputs from two input references, with a maximum output frequency of 800 MHz.
800 MHz ceiling and the 3.3V supply rail
The 800 MHz maximum frequency sets the upper bound for the clock-tree tier this part can serve — it handles 10GbE reference clocks, FPGA transceiver refclks, and ADC/DAC sampling clocks in that band. The supply range is 3.15 V to 3.45 V, a tight 3.3 V ±0.15 V window; the board's 3.3 V rail must stay within that envelope under load, or the PLL may lose lock or the output jitter degrades.