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ICS81006I

VCXO-TO-LVCMOS OUTPUTS

Integrated Device Technology 

ICS81006I

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

C

C

L1

L2

➤

Optional

FIGURE 1: VCXO OSCILLATOR CIRCUIT

VC Control voltage used to tune frequency

C Varactor capacitance, varies due to the change in

V

control voltage

C C Load tuning capacitance used for fine tuning or

L1, L2

centering nominal frequency

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

board parasitics

TABLE 5. EXAMPLE CRYSTAL PARAMETERS

Symbol

fN

f

T

fS

CL

CO

C0, C1

ESR

Parameter

Nominal Frequency

Frequency Tolerance

Frequency Stability

Operating Temperature Range

Load Capacitance

Shunt Capacitance

Pullability Ratio

Equivalent Series Resistance

Drive Level

Aging @ 25°C

Mode of Operation

IDT™ / ICS™ VCXO-TO-LVCMOS OUTPUTS

Test Conditions

8

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

ICS81006AKI REV A OCTOBER 2, 2006

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