ICS814252CKI-02LF IDT, Integrated Device Technology Inc, ICS814252CKI-02LF Datasheet - Page 13

• Manufacturer Part Number: ICS814252CKI-02LF
• Description: IC VCXO/FEMTOCLK 2LVDS 32-VFQFPN
• Manufacturer: IDT, Integrated Device Technology Inc
• Series: HiPerClockS™, FemtoClock®r
• Type: Frequency Translator, Jitter Attenuator, Voltage Controlled Crystal Oscillator (VCXO)r

Specifications of ICS814252CKI-02LF

• Pll: Yes
• Input: HCSL, LVDS, LVHSTL, LVPECL, SSTL
• Output: LVDS
• Number Of Circuits: 1
• Ratio - Input:output: 3:2
• Differential - Input:output: Yes/Yes
• Frequency - Max: 312.5MHz
• Divider/multiplier: Yes/Yes
• Voltage - Supply: 3.135 V ~ 3.465 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-VFQFN
• Frequency-max: 312.5MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 814252CKI-02LF

VCXO-PLL E
Choosing the correct external components and having a proper
printed circuit board (PCB) layout is a key task for quality operation
of the VCXO-PLL. In choosing a crystal, special precaution must
be taken with the package and load capacitance (C
frequency, accuracy and temperature range must also be
considered. Since the pulling range of a crystal also varies with
the package, it is recommended that a metal-canned package
like HC49 be used. Generally, a metal-canned package has a
larger pulling range than a surface mounted device (SMD). For
crystal selection information, refer to the VCXO Crystal Selection
Application Note.
The crystal’s load capacitance C
resonating frequency and is closely related to the VCXO tuning
range. The total external capacitance seen by the crystal when
installed on a board is the sum of the stray board capacitance, IC
package lead capacitance, internal varactor capacitance and any
installed tuning capacitors (C
If the crystal C
VCXO will oscillate at a higher frequency than the crystal
specification. If the crystal C
capacitance, the VCXO will oscillate at a lower frequency than
IDT
VCXO C
VCXO-PLL L
C
B
1
S
k
C
C
9
3
S
C
C
C
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f
f
f
RYSTAL
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T
S
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0
ICS814252I-02
VCXO JITTER ATTENUATOR & FEMTOCLOCK™ MULTIPLIER
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). In addition,
S
m
6
2
1
k ( Ω Ω Ω Ω Ω )
8
2
2
H
U
0
1
1
F
p
p
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F
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t i
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13
S
1
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±
0 .
1 .
1 .
M
3
the crystal specification. In either case, the absolute tuning range
is reduced. The correct value of C
characteristics of the VCXO. The recommended C
Parameter Table balances the tuning range by centering the tuning
curve.
The VCXO-PLL Loop Bandwidth Selection Table shows R
and C
configurations. The device has been characterized using these
parameters. For other configurations, refer to the Loop Filter
Component Selection for VCXO Based PLLs Application Note.
The crystal and external loop
filter components should be
kept as close as possible to the
device. Loop filter and crystal
traces should be kept short and
separated from each other.
Other signal traces should be
kept separate and not run
underneath the device, loop
filter or crystal components.
) F
a
p
i x
±
±
2
8
2
r e
4
2
2
1
m
0
5
0
0
0
e y
P
u
values for recommended high, mid and low loop bandwidth
m
r a
C
0
0
P
0
0 .
0 .
0 .
µ (
0
0
U
1
0
M
p
p
p
) F
m
1
1
°
p
p
i n
p
p
p
H
C
W
F
F
m
m
m
s t
z
R
S
9
E
2
2
ICS814252CKI-02 REV. A OCTOBER 5, 2007
T
0 .
2 .
2 .
k ( Ω Ω Ω Ω Ω )
9
1
1
C
25MHz
TUNE
C
P
L
is dependant on the
C
C
R
TUNE
S
S
PRELIMINARY
R
SET
L
in the Crystal
LF0
LF1
ISET
XTAL_IN
XTAL_OUT
S
, C
S