Si5351 Application Examples; Replacing Crystals And Crystal Oscillators - Silicon Laboratories SI5351A/B/C Product Manual

Si5351A/B/C

5.2. Si5351 Application Examples

The Si5351 is a versatile clock generator which serves a wide variety of applications. The following examples show
how it can be used to replace crystals, crystal oscillators, VCXOs, and PLLs.

5.3. Replacing Crystals and Crystal Oscillators

Using an inexpensive external crystal, the Si5351A can generate up to 8 different free-running clock frequencies
for replacing crystals and crystal oscillators. A 3-output version packaged in a small 10-MSOP is also available for
applications that require fewer clocks. An example is shown in Figure 13.
XA
27 MHz
XB
Figure 13. Using the Si5351A to Replace Multiple Crystals, Crystal Oscillators, and PLLs
18
Multi
Synth
0
OSC
PLL
Multi
Synth
1
Multi
Synth
2
Multi
Synth
3
Multi
Synth
4
Multi
Synth
5
Multi
Synth
6
Multi
Synth
Si5351A
7
Note: Si5351A replaces crystals, XOs, and PLLs.
Preliminary Rev. 0.95
CLK0
125 MHz
Ethernet
PHY
CLK1
48 MHz
USB
Controller
CLK2
28.322 MHz
HDMI
Port
CLK3
74.25 MHz
CLK4
74.25/1.001 MHz
Video/Audio
CLK5
Processor
24.576 MHz
CLK6
22.5792 MHz
CLK7
33.3333 MHz
CPU