SI53321 Datasheet, PDF (15/28 Pages) Silicon Laboratories – 1:10 LOW JITTER LVPECL CLOCK BUFFER

Si53321
2.7. Input Mux Noise Isolation
The input clock mux is designed to minimize crosstalk between the CLK0 and CLK1. This improves phase jitter
performance when clocks are present at both the CLK0 and CLK1 inputs. Figure 11 below is a measurement the
input mux’s noise isolation.
LVPECL output@156.25MHz;
Selected clk is active
Unselected clk is static
LVPECL output@156.25MHz;
Selected clk is static
Unselected clk is active
Mux Isolation = 61dB
Figure 11. Input Mux Noise Isolation
2.8. Power Supply Noise Rejection
The device supports on-chip supply voltage regulation to reject noise present on the power supply, simplifying low
jitter operation in real-world environments. This feature enables robust operation alongside FPGAs, ASICs and
SoCs and may reduce board-level filtering requirements. For more information, see “AN491: Power Supply
Rejection for Low Jitter Clocks”.
Rev. 1.0
15