SI5351-B Datasheet, PDF (20/41 Pages) Silicon Laboratories – Supports static phase offset

Si5351A/B/C-B
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.
27 MHz
XA
OSC
PLL
XB
Si5351A
Multi
Synth
0
Multi
Synth
1
Multi
Synth
2
Multi
Synth
3
Multi
Synth
4
Multi
Synth
5
Multi
Synth
6
Multi
Synth
7
Note: Si5351A replaces crystals, XOs, and PLLs.
CLK0
CLK1
125 MHz
48 MHz
CLK2
CLK3
28.322 MHz
74.25 MHz
CLK4 _{74.25/1.001 MHz}
CLK5
24.576 MHz
CLK6
CLK7
22.5792 MHz
33.3333 MHz
Ethernet
PHY
USB
Controller
HDMI
Port
Video/Audio
Processor
CPU
Figure 13. Using the Si5351A to Replace Multiple Crystals, Crystal Oscillators, and PLLs
5.4. Replacing Crystals, Crystal Oscillators, and VCXOs
The Si5351B combines free-running clock generation and a VCXO in a single package for cost sensitive video
applications. An example is shown in Figure 14.
XA
27 MHz
OSC
PLL
XB
VC
VCXO
Si5351B
Multi
Synth
0
Multi
Synth
1
Multi
Synth
2
Multi
Synth
3
Multi
Synth
4
Multi
Synth
5
CLK0
Free-running
Clocks
125 MHz
CLK1
48 MHz
CLK2
28.322 MHz
CLK3
74.25 MHz
CLK4 _{74.25/1.001 MHz}
CLK5
24.576 MHz
VCXO Clock
Outputs
Ethernet
PHY
USB
Controller
HDMI
Port
Video/Audio
Processor
Note: FBW = 10 kHz
Figure 14. Using the Si5351B to Replace Crystals, Crystal Oscillators, VCXOs, and PLLs
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Rev. 1.0