CX2V Datasheet, PDF (2/2 Pages) EUROQUARTZ limited – Miniature Crystal for Pierce Oscillators

EURO QUARTZ
Miniature Crystal for Pierce Oscillators
CX-2V CRYSTAL
16kHz to 600kHz
LOAD CAPACITANCE (CL)*
Frequency
Load
Range (kHz) Capacitance
16~24.9
25~54.9
55~100.0
10pF
9pF
8pF
Frequency
Load
Range (kHz) Capacitance
100.0~179.9 5pF
180~600
4pF
* The load capacitance we use to calibrate CX2VSM.
(Other CL is available.)
FIGURE 1
CX2V Typical Motional Resistance R1
CRYSTAL EQUIVALENT CIRCUIT
R1 Motional Resistance
L1 Motional Inductance
C1 Motional Capacitance C0 Shunt Capacitance
FIGURE 2
CX2V Typical Motional Capacitance C1
CONVENTIONAL CMOS PIERCE OSCILLATOR CIRCUIT
FIGURE 3
CX2V Typical Quality Factor (Q)
PACKAGE HANDLING
The CX crystal is hermetically sealed in a ceramic package. Normal
handling and soldering precautions for small, low thermal mass parts
are adequate when installing or testing CX crystals. CX crystals may
be wave soldered with proper precaution taken to avoid desoldering
the leads. A slow machine rate or too high a pre-heat temperature or
solder bath temperature may damage the crystals. Lead to package
solder interface temperature should not exceed 175°C, glass lid
to package seal rim temperature should not exceed 210°C. If
the seal rim reaches temperatures above the maximum specified, the
package may lose its hermeticity. Loss of hermeticity results in a
frequency decrease and motional resistance increase.
FIGURE 4
CX2V Typical Turning Point Temperature (To)
Turning Point Temperature
Note: Frequency f at temperature T is related to frequency F0 at
turning point temperature To by:
f-fo _=k(T-To)2
fo
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
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