EUROQUARTZ CX-1C-SM21.0A Cx miniature crystal Datasheet

CX MINIATURE CRYSTALS
EUROQUARTZ
Telephone:
+44(0)1460 230000
Fax:
+44(0)1460 230001
Email: [email protected]
Web: www.euroquartz.co.uk
Page
CX-1-SM
1 of 2
530kHz to 2.1MHz
MINIATURE SMD CRYSTAL
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General Description
The miniature CX-1-SM crystals in leadless ceramic packages have
been designed for surface-mounting on printed circuit boards or
hybrid circuits. Hermitically sealed in a rugged, miniature ceramic
package, the CX-1-SM crystal is manufactured using a photolithographic process.
Extensional mode
Ideal for use with microprocessors
Designed for low-power applications
Compatible with hybrid or PC board packaging
Low ageing
Full military environmental testing available
Ideal for battery operated applications
Specification
D
(TO P)
Frequency Range:
Functional Mode:
Calibration Tolerance*:
530kHz to 2 .1MHz
Extensional
A ±0.05% (±500ppm)
B ±0.1%
C ±1.0%
7pF
Load Capacitance:
3kW max.
Motional Resistance (R1):
1.2fF
Motional Capacitance (C1):
150k
Quality Factor (Q):
1.0pF
Shunt Capacitance (C0):
3mW max.
Drive Level:
35°C
Turning Point (T0)**:
Note: Frequency (f) deviation from frequency (f0) @ turning point
temperature (T0):
f-fo k(T-To)2
=
fo
A
E
D
B
C
E
Outline
CX-1-SM Package Dimensions
Dimension
Typical
(mm)
Maximum
(mm)
A
8.00
8.38
B
3.56
3.94
C
-
see below
D
1.14
1.40
E
1.52
1.78
Dimension
“C”
Glass Lid
(mm max.)
Ageing, first year:
Shock, survival:
Vibration, survival:
Operating Temperature:
Storage Temperature:
Process Temperature:
Ceramic Lid
(mm max.)
SM1
1.65
1.78
SM2
1.70
1.83
SM3
1.78
1.90
Specifications are typical at 25°C unless otherwise indicated.
*
**
Equivalent Circuit
1
L1
±5ppm max.
750g 0.3ms, ½ sine
10g rms, 20-1,000Hz random
-10°~+70°C (commercial)
-40°~+85°C (industrial)
-55°~+125°C (military)
-55°C~+125°C
260°C for 20 seconds
Tighter frequency calibration available
Other turning point available
Solder Pad Layout
C1
R1
2
1.78
C0
4.06
6.86
L 1 Motional Inductance
C 1 Motional Capacitance C0 Shunt Capacitance
R 1 Motional Resistance
CX MINIATURE CRYSTALS
EUROQUARTZ
Telephone:
+44(0)1460 230000
Fax:
+44(0)1460 230001
Email: [email protected]
Web: www.euroquartz.co.uk
Page
CX-1-SM
530kHz to 2.1MHz
MINIATURE SMD CRYSTAL
2 of 2
Circuit Design
Conventional HCMOS Pierce Oscillator Circuit
Typical Pierce Oscillator Application
Rf
Amplifier
The low profile CX miniature surface-mount crystal is ideal for small,
battery operated portable products. The CX crystal design in a Pierce
oscillator (single inverter) circuit has a very low current consumption
with high stability. A conventional HCMOS Pierce oscillator circuit is
shown below. The crystal is effectively inductive and in a Pi network
with C1 and C2 which provides the additional phase-shift necessary
to sustain oscillation. The oscillation frequency (f0) is 15ppm to
150ppm above the crystal’s series resonant frequency (FS).
CS
C1
Drive Level
CX-1
Buffer
Osc.
Freq. (Fo)
RA
C2
RA is used to limit the crystal’s drive level by forming a voltage
divider between RA and C1. RA also stabilizes the oscillator against
changes in the amplifiers output resistance (R0). RA should be
increased for higher voltage operation.
Terminations
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:
C x C2
CL = 1
C
C1 + C2 + S
NOTE: C1 and C2 include stray layout capacitance to ground. CS is
the stray shunt capacitance between the crystal terminals. In
practice, the effective valus of CL will be less than that calculated
from C1, C2, and CS values due to the effect of the amplifier output
resistance. CS should be minimized.
Designation
SM1
Gold Plated
SM2
Nickel, Silver Plated
SM3
Nickel, Solder Plated and Solder Dipped
Packaging
The oscillation frequency (f0) is approximately equal to:
C1
f 0 = f S 1+
2(C0 + CL )
Where FS = Series resonant frequency of the crystal
C1 = Motional Capacitance
C0 = Shunt Capacitance
CX-1-SM - Tray Pack (Standard)
- 16mm tape, 178mm or 330mm reels (Optional)
per EIA 481
Order Code
CX-1
Blank = Glass Lid
C = Ceramic Lid
“S” if special
or custom design
Blank if standard
Frequency
-SM1 1.0MHz
SM1
SM2
SM3
Calibration
Tolerance*
@ 25°C
(A)
*For other
(B)
calibrations
(C)
insert value
in ppm
Termination
(A / I)
Temperature
Range:
C = Commercial
I = Industrial
M = Military
S = Specify
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