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ICS10001B21 Datasheet(PDF) 16 Page - Integrated Circuit Systems

Part # ICS10001B21
Description  FEMTOCLOCKS-TM DUAL VCXO VIDEO PLL
PDF  21 Pages
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Manufacturer  ICST [Integrated Circuit Systems]
Direct Link  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS10001B21 Datasheet(HTML) 16 Page - Integrated Circuit Systems

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810001BK-21
www.icst.com/products/hiperclocks.html
REV. A AUGUST 12, 2005
16
Integrated
Circuit
Systems, Inc.
ICS810001-21
FEMTOCLOCKS™DUAL VCXO VIDEO PLL
PRELIMINARY
VCXO CRYSTAL SELECTION
Choosing a crystal with the correct characteristics is one of the
most critical steps in using a Voltage Controlled Crystal Oscillator
(VCXO). The crystal parameters affect the tuning range and
V
C
Control voltage used to tune frequency
C
V
Varactor capacitance, varies due to the change in
control voltage
CRYSTAL PARAMETER EXAMPLES
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VARACTOR PARAMETERS
accuracy of a VCXO. Below are the key variables and an
example of using the crystal parameters to calculate the tuning
range of the VCXO.
C
L1, CL2
Load tuning capacitance used for fine tuning or
centering nominal frequency
C
S1, CS2
Stray Capacitance caused by pads, vias, and other
board parasitics
Oscillator
FIGURE 1: VCXO OSCILLATOR CIRCUIT EXAMPLE
VCXO (Internal)
CV
CV
CL1
CL2
Optional
CS1
CS2
VC
“Control Voltage”
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