Low-Jitter Frequency Synthesizer

with Selectable Input Reference

_______________________________________________________________________________________

5

t

INRUSH CURRENT

(mA)

Figure 1. LVPECL Input Inrush Current

REFCLK0

REFCLK1

OUTxx

IN0FAIL

IN1FAIL

LOCK

HIGH

SEL_CLK

LOW

POWER-ON-RESET (~ 20

μs)

HIGH

μs)

PLL LOCKED TO REFCLK0

Figure 2. Power-Up, PLL Locks to REFCLK0