Data Sheet

EURO QUARTZ
CX-1-03 CRYSTAL
Miniature Crystal
530kHz to 2.1MHz
FEATURES
Extensional Mode
Ideal for use with microprocesors
Designed for low power applications
Full military testing available
Low ageing
OUTLINE & DIMENSIONS
DESCRIPTION
CX-1-03 crystals are high quality extensional mode crystals,
hermetically sealed in a rugged, ceramic package.
SPECIFICATION
Specifications stated are typical at 25°C unless otherwise indicated.
Specifications may change without notice.
Frequency Range:
Functional Mode:
Calibration Tolerance*:
530kHz to 2.1MHz
Extensional
A = ±500ppm (0.05%)
B = ±1000ppm (0.1%)
C = ±10000ppm (1.0%)
7pF
3kΩ maximum
1.2fF
150k
3.0µW max.
35°C
-0.035ppm/°C2
Load Capacitance:
Motional Resistance:
Motional Capacitance:
Quality Factor:
Drive Level:
Turning Point (T0)**:
Temperature Coefficient (k):
PACKAGING
CX-1-03 crystals are Tray Packed as standard.
Note: Frequency f at temperature T is related to frequency F0 at
turning point temperature To by:
f-fo
=k(T-To)2
fo
Ageing, first year:
5ppm max.
Shock, survival:
750g peak, 0.3ms, ½ sine
Vibration, survival:
10g rms, 20~1000Hz random
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 notes.
*
**
Tighter tolerances are available.
Other values are available
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.
HOW TO ORDER CX-1-03 CRYSTALS
CX-1 - S
-
'S' if special,
custom design.
Otherwise leave
blank
C
Blank = glass lid
C = ceramic lid
-03
Side Leads
-
1.0M,
Frequency
K = kHz
M = MHz
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-1-03 CRYSTAL
Miniature Crystal
530kHz to 2.1MHz
CONVENTIONAL CMOS PIERCE OSCILLATOR CIRCUIT
CRYSTAL EQUIVALENT CIRCUIT
R1 Motional Resistance
C1 Motional Capacitance
L1 Motional Inductance
C0 Shunt Capacitance
TYPICAL APPLICATION FOR A
PIERCE OSCILLATOR
The low profile CX miniature crystal is ideal for use in small, high
density, battery operated portable products. The CX crystal designed
in a Pierce oscillator (single inverter) circuit provides very low current
consumption and high stability. A conventional Pierce oscillator is
shown above. The crystal is effectively inductive and in a Pi network
circuit with CD and CG provides the additional phase shift to sustain
oscillation. The oscillation frequency (fO) is 15 to 250ppm above the
crystal's resonant frequency (fS).
Drive Level
RA is used to limit the crystal's drive level by forming a voltage divider
between RA and CD. RA also stabilizes the oscillator against changes in
the amplifier's output resistance (RO). RA should be increased for
higher voltage operation.
Load Capacitance
The CX crystal calibration tolerance is influenced by the effective
circuit capacitances, specified as the load capacitance (CL). CL is
approximately equal to:
CL =
CD x CG
CD + CG
+ CS
Note: CD and CG include stray layout-induced capacitance to ground
and CS is the stray shunt capacitance between the crystal terminal. In
practice, the effective value of CL will be less than that calculated from
CD, CG and CS values because of the effect of the amplifier output
resistance. CS should be minimized.
The oscillation frequency (fO) is approximately equal to:
fO = fS
1+
C1
2(C O + C L )
Where
FS = Series resonant frequency of the crystal
C1 = Motional Capacitance
CO = Shunt Capacitance
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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