si5351 Silicon Laboratories, si5351 Datasheet
si5351
Manufacturer Part Number
si5351
Description
Si5350a Factory-programmable Cmos Clock Generator
Manufacturer
Silicon Laboratories
Datasheet
1.SI5351.pdf
(42 pages)
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I
Features
Applications
Description
The Si5351 is an I
crystals, crystal oscillators, VCXOs, phase-locked loops (PL), and fanout buffers in
cost-sensitive applications. Based on a PLL/VCXO + high resolution MultiSynth
fractional divider architecture, the Si5351 can generate any frequency up to 133 MHz
on each of its outputs with 0 ppm error. Three versions of the Si5351 are available to
meet a wide variety of applications. The Si5351A generates up to 8 free-running
clocks using an internal oscillator for replacing crystals and crystal oscillators. The
Si5351B adds an internal VCXO and provides the flexibility to replace both free-
running clocks and synchronous clocks. The Si5351B eliminates the need for higher
cost, custom pullable crystals while providing reliable operation over a wide tuning
range. The Si5351C offers the same flexibility but synchronizes to an external
reference clock (CLKIN).
Functional Block Diagram
Rev. 0.1 11/10
2
SSEN
OEB
C - P
Generates up to 8 non-integer
frequencies from 8 kHz to 133 MHz
I
Exact frequency synthesis at each
output (0 ppm error)
Highly linear VCXO
Optional clock input (CLKIN)
Low output period jitter: 100 ps pp
Configurable spread spectrum
selectable at each output
Operates from a low-cost, fixed
frequency crystal: 25 or 27 MHz
HDTV, DVD/Blu-ray, set-top box
Audio/video equipment, gaming
Printers, scanners, projectors
I
2
2
C
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
C user definable configuration
XA
XB
RO G RA M M AB L E
OSC
N = 2 or 7
PLLA
PLLB
2
C configurable clock generator that is ideally suited for replacing
Si5351A
Synth
Synth
Synth
Multi
Multi
Multi
1
N
0
A
N Y
Copyright © 2010 by Silicon Laboratories
- F
SSEN
OEB
I
2
VC
R EQ U E NC Y
C
XA
XB
Glitchless frequency changes
Separate voltage supply pins:
Excellent PSRR eliminates external
power supply filtering
Very low power consumption
Adjustable output-output delay
Available in 3 packages types:
Residential gateways
Networking/communication
Servers, storage
Core VDD: 2.5 V or 3.3 V
Output VDDO: 2.5 V or 3.3 V
10-MSOP: 3 outputs
24-QSOP: 8 outputs
20-QFN (4x4 mm): 8 outputs
OSC
VCXO
PLL
C M O S C
Si5351B
Synth
Synth
Synth
Synth
Synth
Synth
Synth
Synth
Multi
Multi
Multi
Multi
Multi
Multi
Multi
Multi
0
1
2
3
4
5
6
7
L O C K
S i 5 3 5 1 A / B / C
CLKIN
INTR
OEB
I
2
C
XA
XB
G
E N E R A T O R
OSC
Ordering Information:
24-QSOP
20-QFN
10-MSOP
See page 41
PLLA
PLLB
Si5351C
+ V C X O
Si5351A/B/C
Synth
Synth
Synth
Synth
Synth
Synth
Synth
Synth
Multi
Multi
Multi
Multi
Multi
Multi
Multi
Multi
0
1
2
3
4
5
6
7
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