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XTAL026397 Datasheet Preview

XTAL026397 Datasheet

SPECIFYING SURFACE MOUNT QUARTZ CRYSTALS

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SPECIFYING SURFACE MOUNT QUARTZ CRYSTALS
www.DataSheet4U.com
A typical surface mount quartz crystal specification reads
like this:
24.0140MHz 12SMX-B 15 30 20 18 Fund TR T
Frequency
Holder Style
Frequency Tolerance at 25°C
Frequency Stability
Lower end of Operating Temp Range
Circuit Condition
Overtone order
Packaging
Additional Text Code (for non-standard product)
The following notes define each element of the
specification.
Frequency
Frequency is normally specified in kilohertz (kHz) up to
999.999kHz and in megahertz (MHz) from 1.0MHz. All our
computer-generated transaction documents follow this
standard convention automatically.
The frequency should be described to seven significant
figures. If seven significant figures are not used, we assume
that any figure that might follow those given may be taken
as zero.Thus a frequency given as 16.6MHz will be taken as
16.60, not 16.66667.
Some specifiers extend the use of kHz to all crystals
operating in fundamental mode, reserving MHz for
overtones. To minimise the possibility of misunderstanding
it is best to use the standard method and specify
fundamental or overtone mode separately.
Please contact the sales office for details of developed
frequencies.
Holder Style
Before manufacture of the crystal can start, the holder style
must be defined. Each holder style covers a frequency
range which is defined in the relevant specification.
Frequency Tolerance
The cost of manufacture depends partly on the accuracy
required at reference temperature (which in the case of the
AT-cut crystal, is usually 25°C).
Where high initial accuracy is important the additional
manufacturing cost should be weighed against the cost of
including a frequency trimming facility within the oscillator.
Frequency Stability
Frequency stability is normally specified as a frequency
tolerance over a defined operating temperature range with
respect to the frequency at reference temperature. The
temperature ranges are defined for each crystal in the
relevant data sheet. However the majority of crystals will
continue to operate quite satisfactorily outside the
temperature range for which they are specified, but
with a possible degradation in the value of frequency
stability. Under normal conditions this will not damage the
crystal.
A crystal designed for operation over a restricted operating
temperature range, (such as from 0 to 50°C) has a better
frequency stability over that range than one designed for
operation over a wide operating temperature range.
Therefore it is important not to over specify the
temperature range, as doing so will result in inferior
performance for the same or greater cost; or greater cost
for the same or inferior performance.
Operating Temperature Ranges
The standard operating temperature ranges for a crystal
are:
0 to 50°C –40 to 90°C
–10 to 60°C –55 to 105°C
–20 to 70°C –55 to 125°C
–30 to 80°C
When the required temperature range is symmetrical about
25°C, it is indicated in the specification by the lower figure,
ie: –20 to 70°C would read ‘20’ as shown in the example. If
the required temperature range is not symmetrical about
25°C, both figures are used, ie: –55 to 85°C and appear in
the additional text code section (T).
Circuit condition
The characters ‘SR’ are used to denote calibration of the
crystal at series resonance. If it is to be calibrated at load
resonance the characters represent the circuit load
capacitance in pF.
Packaging Codes
Tray packaging is available as an option for CX-1 products
outlined in the SM Quartz Crystal chapter.
Unless individual data sheets state Bulk packaging, items
will be Tape & Reel packed. Please note: only complete
reels are sold.
BU = Bulk packed
TR = Tape & Reel packed
TY = Tray packed
Europe Tel: +44 (0)1460 270200
Americas Tel: +1 919 941 9333
Asia Tel: +86 755 8826 5991
Fax: +44 (0)1460 72578
Fax: +1 919 941 9371
Fax: +86 755 8826 5990
Website: www.cmac.com




C-MAC

XTAL026397 Datasheet Preview

XTAL026397 Datasheet

SPECIFYING SURFACE MOUNT QUARTZ CRYSTALS

No Preview Available !

Additional Text Code
If the product is non-standard, the letter ‘T’ will appear at
the end of the product specification. This refers to
additional text on the quotation/sales order to identify the
special requirements.
Outline Drawings
Dimensions on the crystal outline drawings are shown only
as a guide. Precise dimensions of crystal holders are
available from our Factory upon request. All dimensions
are shown in mm and are nominal unless otherwise stated.
www.DataSheet4U.com
Standard Frequency Tolerances and Stabilities
±10ppm, ±15ppm, ±20ppm, ±30ppm,
±100ppm
±50ppm,
Soldering Conditions
Recommended solder pad layouts are shown on each data
sheet. For typical soldering conditions, please see the
relevant page in Application Notes.
Marking
Where possible the frequency of operation will be marked
in full on the crystal. On the smaller types the full frequency
may not fit in the available space and will therefore be
truncated. Please refer to the despatch packaging for the
relevant crystal to see the frequency in full.
Ordering Information
See individual data sheets
Stability Conversion Chart
10 x
10 –3
10 –4
10 –5
10 –6
10 –7
10 –8
10 –9
10 –10
PPM
1000
100
10
1
0.1
0.01
0.001
0.0001
%
0.1
0.01
0.001
0.0001
0.00001
0.000001
0.0000001
0.00000001
Europe Tel: +44 (0)1460 270200
Americas Tel: +1 919 941 9333
Asia
Tel: +86 755 8826 5991
Fax: +44 (0)1460 72578
Fax: +1 919 941 9371
Fax: +86 755 8826 5990
Website: www.cmac.com


Part Number XTAL026397
Description SPECIFYING SURFACE MOUNT QUARTZ CRYSTALS
Maker C-MAC
Total Page 4 Pages
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