SPECIFICATIONS
TYPICAL APPLICATION
FOR A PIERCE OSCILLATOR
o
Specifications are typical at 25 C unless otherwise noted.
Specifications are subject to change without notice.
The low profile CX miniature leaded crystal is ideal for 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 CMOS Pierce oscillator circuit is shown below.
The crystal is effectively inductive and in a PI-network circuit
with C and C provides the additional phase shift
Frequency Range
Functional Mode
530 kHz - 2.1 MHz
Extensional
Calibration Tolerance*
A
B
C
+_ 0.05% ( +_ 500ppm)
+_ 0.1%
+_ 1.0%
D
G
necessary to sustain oscillation. The oscillation frequency
(f ) is 15 to 150 ppm above the crystal’s series resonant
O
Load Capacitance
7 pF
frequency (f ).
s
Motional Resistance (R1)
3 k⍀
MAX
Drive Level
Motional Capacitance (C1) 1.2fF
R is used to limit the crystal’s drive level by forming a
A
Quality Factor (Q)
Shunt Capacitance (C0)
Drive Level
150 k
1.0 pF
W MAX.
35oC
voltage divider between R and C . R also stabilizes the
A
D
A
oscillator against changes in the amplifiers output
resistance (R ). R should be increased for higher voltage
0
A
3
operation.
Turning Point (T )**
O
Load Capacitance
Temperature Coefficient (k) -0.035 ppm/ oC2
The CX crystal calibration tolerance is influenced by the
effective circuit capacitances, specified as the load
capacitance (C ). C is approximately equal to:
Note: Frequency (f) deviation from frequency (fO) @ turning
point temperature (TO);
2
L
L
f-f
O
=
k(T-T )
O
f
C x C
O
D
G
=
+
(1)
C
C
S
L
Aging, first year
Shock
5ppm MAX.
C + C
D
G
750g peak, 0.3 msec., 1/ 2 sine
NOTE: C and C include stray layout to ground and C
s
D
G
Vibration, survival
Operating Temperature
10g rms, 20-1,000 Hz random
is the stray shunt capacitance between the crystal
-10oC to +70oC Commercial
-40oC to +85oC Industrial
-55oC to +125oC Military
terminal. In practice, the effective value of C will be less
L
than that calculated from C , C and C values because
D
G
S
of the effect of the amplifier output resistance. C should
S
be minimized.
Storage Temperature
-55oC to +125oC
The oscillation frequency (f ) is approximately equal to:
O
Max Process Temperature See package handling
C
1
* Tighter frequency calibration available.
** Other turning point available.
=
+
(2)
f
f
S
1
[
O
]
2(C + C )
0
L
Where
= Series resonant frequency of the crystal
= Motional Capacitance
f
C
C
S
HOW TO ORDER CX-1-03 LEADED CRYSTALS
1
= Shunt Capacitance
0
CX-1
-03
1.0 MHz
( A / I )
Temp. Range:
CONVENTIONAL CMOS
PIERCE OSCILLATOR CIRCUIT
“S” if special
or custom
design. Blank
if Std.
Blank=Glass Lid
C=Ceramic Lid
Side
Leads
Calibration
Tolerance* C = Commercial
@ 250C
(A)
I = Industrial
M = Military
S = Specify
Rf
Frequency
(B)
(C)
*Other calibration fill in ppm.
BUFFER
OSC
Freq (f )
RA
AMPLIFIER
CS
O
PACKAGING
Contact factory for
design guidelines
CX-1V-03 -Tray Pack (Standard)
CG
CD
CX-1
10130 - Rev B
RSG Electronic Components GmbH, Sprendlinger Landstr. 115, 63069 Offenbach, Germany, Tel. +49 69 - 984047-0, Fax: +49 69 - 9840-77, www.rsg-electronic.de
RSG [ RSG ELECTRONIC COMPONENTS GMBH ]
