Data Sheet

EURO QUARTZ
CX-2V CRYSTAL
Miniature Crystal for Pierce Oscillators
16kHz to 600kHz
FEATURES
Frequency Range 16kHz to 600kHz
High shock resistance
Low ageing
Designed for low power applications
Full MIL testing available
DESCRIPTION
OUTLINE & DIMENSIONS
CX-2V crystals are high quality tuning fork crystals intended for use in
Pierce (single inverter) oscillator circuits. The crystal is hermetically
sealed and rugged.
SPECIFICATION
Specifications stated are typical at 25°C unless otherwise indicated.
Specifications may change without notice.
Frequency Range:
16.0kHz to 600.0kHz
Functional Mode:
Tuning Fork (Flexure)
Standard Calibration Tolerance*: A, B or C
Motional Resistance (R1):
Figure 1
Max = 16~24.9kHz, 2x typical
25~600kHz, 2.5x typical
Motional Capacitance (C1):
Figure 2
Quality Factor (Q):
Figure 3
Min. is 0.25x typical
Shunt Capacitance (C0):
2.0pF max.
Drive Level
16~24.9kHz:
0.5µW max.
25~600.0kHz: 1.0µW max.
Turning Point (T0)**:
Figure 4
Temperature Coefficient (k):
-0.035ppm/°C2
Ageing, first year:
5ppm max.
Shock, survival***:
1,500g, 0.3ms, ½ sine
Vibration, survival***:
10g rms, 20~2000Hz
Operating Temperature Range
Commercial:
-10° to +70°C
Industrial:
-40° to +85°C
Military:
-55 to +125°C
Storage Temperature Range:
-55° to +125°C
Maximum Process Temperature:
See package handling note
* Tighter frequency calibration is available.
** Other turning point is available
*** Higher shock and vibration survival is available
STANDARD CALIBRATION TOLERANCE
PACKAGING
Frequency Range (kHz)
CX-2V leaded crystals are supplied in tray pack (Standard)
16 ~74.9
A
B
C
0.003%
0.01%
0.1%
75~169.9
0.005%
0.01%
0.1%
170~249.9
0.01%
0.02%
0.2%
250~600
0.02%
0.05%
0.5%
HOW TO ORDER CX-2V CRYSTALS
CX-2V - S
- 02 - 32.768kHz,
'S' if special,
custom design.
Otherwise leave
blank
Leads
02
03
04
Frequency
K = kHz
A
Calibration
Tolerance
@25°C
A
B
C
/
I
Temp. Range
C = -10° ~ +70°C
I = -40° ~ +85°C
M = -55° ~ +125°C
S = Customer specified
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001 [email protected] www.euroquartz.co.uk
EURO QUARTZ
CX-2V CRYSTAL
Miniature Crystal for Pierce Oscillators
16kHz to 600kHz
FIGURE 1
CX2V Typical Motional Resistance R1
LOAD CAPACITANCE (CL)*
Frequency
Range (kHz)
16~24.9
25~54.9
55~100.0
Load
Capacitance
10pF
9pF
8pF
Frequency
Range (kHz)
100.0~179.9
180~600
Load
Capacitance
5pF
4pF
* The load capacitance we use to calibrate CX2VSM.
(Other CL is available.)
CRYSTAL EQUIVALENT CIRCUIT
R1 Motional Resistance
C1 Motional Capacitance
L1 Motional Inductance
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
Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001 [email protected] www.euroquartz.co.uk
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