Si516
D
U A L
F
REQUENCY
V
OLTAGE
- C
ON TROLLED
C
R YS TA L
O
SCILLATOR
( V C X O ) 1 0 0 k H
Z T O
250 M H
Z
Features
Supports any frequency from
100 kHz to 250 MHz
Two selectable output frequencies
1 ps rms jitter (typ)
Short lead times: <2 weeks
AT-cut fundamental mode crystal
ensures high reliability/low aging
High power supply noise rejection
1% control voltage linearity
Available CMOS, LVPECL,
LVDS, and HCSL outputs
Optional 1:2 CMOS fanout buffer
3.3 and 2.5 V supply options
Industry-standard 3.2 x 5.0 mm
and 5 x 7 mm package/pinouts
Pb-free/RoHS-compliant
Selectable Kv (60, 90, 120,
150 ppm/V)
Si5602
Ordering Information:
See page 11.
Applications
SONET/SDH/OTN
PON
Low Jitter PLLs
xDSL
Broadcast video
Telecom
Switches/routers
FPGA/ASIC clock generation
Pin Assignments:
See page 9.
Vc 1
FS
GND
2
3
6 V
DD
5 NC
4 CLK
Description
The Si516 dual frequency VCXO utilizes Silicon Laboratories' advanced PLL
technology to provide any frequency from 100 kHz to 250 MHz. Unlike a
traditional VCXO where a different crystal is required for each output
frequency, the Si516 uses one fixed crystal and Silicon Labs’ proprietary
synthesizer to generate any frequency across this range. This IC-based
approach allows the crystal resonator to provide enhanced reliability,
improved mechanical robustness, and excellent stability. In addition, this
solution provides superior control voltage linearity and supply noise
rejection, improving PLL stability and simplifying low jitter PLL design in
noisy environments. The Si516 is factory-configurable for a wide variety of
user specifications, including frequency, supply voltage, output format,
tuning slope and stability. Specific configurations are factory-programmed at
time of shipment, eliminating long lead times and non-recurring engineering
charges associated with custom frequency oscillators.
CMOS Dual VCXO
Vc
FS
G ND
1
2
3
6 V
DD
5 CLK–
4 CLK+
LVPECL/LVDS/HCSL/Dual CM OS
Dual VCXO
Functional Block Diagram
Preliminary Rev. 0.9 3/11
Copyright © 2011 by Silicon Laboratories
Si516
Si516
T
ABLE O F
C
ONTENTS
Section
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
2.1. Dual CMOS Buffer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4. Si516 Mark Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
5. Package Outline Diagram: 5 x 7 mm, 6-pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6. PCB Land Pattern: 5 x 7 mm, 6-pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
7. Package Outline Diagram: 3.2 x 5.0 mm, 6-pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8. PCB Land Pattern: 3.2 x 5.0 mm, 6-pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Preliminary Rev. 0.9
3
Si516
Table 2. Vc Control Voltage Input
V
DD
= 2.5 or 3.3 V ±10%, T
A
= –40 to +85
o
C
Parameter
Control Voltage Range
Control Voltage Tuning Slope
(10 to 90% V
DD
)
Kv Variation
Control Voltage Linearity
Modulation Bandwidth
Vc Input Impedance
Symbol
V
C
Kv
Kv_var
L
VC
BW
Z
VC
Test Condition
Min
0.1 x V
DD
Typ
V
DD
/2
Max
0.9 x V
DD
Units
V
ppm/V
Ordering option
—
BSL
–5
—
—
60, 90, 120, 150
—
±1
10
100
±10
+5
—
—
%
%
kHz
k
Table 3. Output Clock Frequency Characteristics
V
DD
= 2.5 or 3.3 V ±10%, T
A
= –40 to +85
o
C
Parameter
Nominal Frequency
Symbol
F
O
F
O
S
T
A
APR
T
SU
T
D
t
FRQ
Test Condition
CMOS
LVDS/LVPECL/HCSL
T
A
= –40 to +85
o
C
Frequency drift over 10-year life
Ordering option
Minimum V
DD
until output fre-
quency (F
O
) within specification
F
O
> 10 MHz
F
O
< 10 MHz
Min
0.1
0.1
–20
—
Typ
—
—
—
—
Max
212.5
250
+20
±8.5
Units
MHz
MHz
ppm
ppm
ppm
ms
µs
µs
ms
Temperature Stability
Aging
Minimum Absolute Pull Range
Startup Time
Disable Time
±30, ±50,±80, ±100
—
—
—
—
—
—
—
—
10
25
60
10
Settling Time after FS Change
Preliminary Rev. 0.9
5
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