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ICS810-06

VCXO-TO-6 LVCMOS OUTPUTS

Integrated Circuit Systems 

Integrated

Circuit

Systems, Inc.

ICS81006

VCXO-TO-6 LVCMOS OUTPUTS

APPLICATION INFORMATION

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 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.

➤ VC

Oscillator

Control Voltage

CV

➤

➤C

V

VCXO (Internal)

XTAL

CS1

CS2

CL1

CL2

➤

Optional

FIGURE 1: VCXO OSCILLATOR CIRCUIT

VC Control voltage used to tune frequency

CV Varactor capacitance, varies due to the change in

control voltage

CL1, CL2 Load tuning capacitance used for fine tuning or

centering nominal frequency

CS1, CS2 Stray Capacitance caused by pads, vias, and other

board parasitics

TABLE 5. EXAMPLE CRYSTAL PARAMETERS

Symbol Parameter

fN

Nominal Frequency

fT

Frequency Tolerance

fS

Frequency Stability

Operating Temperature Range

CL

CO

C0, C1

ESR

Load Capacitance

Shunt Capacitance

Pullability Ratio

Equivalent Series Resistance

Drive Level

Aging @ 25°C

Mode of Operation

Test Conditions

Minimum Typical Maximum

19.44

±20

±20

0

70

12

4

220

240

20

1

±3 per year

Fundamental

Units

MHz

ppm

ppm

°C

pF

pF

mW

ppm

81006AK

www.icst.com/products/hiperclocks.html

9

REV. A JANUARY 4, 2006

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