1. ComponentsMarketplaceSpecialReport:Crystals|March2011
Crystals Lithium Battery
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Oscillating
with accuracy
For almost every electronics application, from microprocessor timing to radio station transmission,
precise frequency control is critical. In order to enable system synchronization and signal
generation, a reference signal or source is generally required for data transfer and communication.
Oscillator, at the heart of most reference sources, produces an output signal without input signal.
By injecting energy composed of noise or the transient power supply response, the start up of
oscillator can be achieved.
Crystal Resonators
• HC series, SMD series,
DIP series, VCXO, TCXO
• Rohs, compliant
• No Pb
Anhui Safe Electronics Co Ltd
SMD Quartz Crystal
Gen-Worldly Quartz Crystal Co Ltd
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2. ComponentsM
Ceramic Crystal
Resonator (SMD)
• All ceramic enclosure
• Frequency available from
3.2768MHz ~ 50MHz
• Initial tolerance up to
±20ppm
• RoHS compliant
• Lead free reflow
solderable
• Package sizes available
from 3.2x2.5mm to
10x4.5mm
Interquip Electronics
Company Ltd
Through the utilization of piezoelectric properties of frequency control products design and manufacture them.
various materials, such as ceramic, Rochelle salt, tourmaline Nowadays, the design and manufacture of crystals and
and silicon dioxide (quartz crystals), signals are produced amplifiers are carried out by separate companies, which
by resonators and filters. Among these materials, quartz changed the paradigm.
crystals are frequently used.
Clock oscillators
Mechanical considerations like vibration, shock and
handling are as important as electrical considerations Being one of the subsets of the general crystal oscillators,
for frequency control devices. These devices need to be clocks are frequently used to supply frequency timing
handled more carefully than most of the other electronic to digital circuits and microprocessors. As they are the
components, as they are fragile despite seemingly rugged simplest of all types of oscillators, they are smaller in size,
packaging. consuming less power and more affordable than the
others.
A feedback network and an amplifier are essential building
blocks for a crystal oscillator. Incorporating a resonator with Clocks require only one power supply voltage for operation
an active device and several discrete components, a stand- and take only a few milliseconds to start up. They can be
alone frequency control device can be produced. found in digital integrated circuits like TTL, CMOS, ECL and
so on. Based on the technology being driven, like 75 MHz
Traditionally speaking, companies specializing in for STTL and 125 MHz for 10k ECL, the frequency range of
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3. ComponentsMarketplaceSpecialReport:Crystals|March2011
Crystals Battery Charger
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these clocks is initially limited.
Among different crystal cuts that
determine the frequency characteristics
of crystals, AT cut is most commonly
used. Calibration frequency tolerances of
below ∮10ppm can be obtained by clocks.
Depending on the temperature change
of critical resistors, capacitors or inductors,
the oscillator circuit could add to the
crystal drift, although its significance in Piezoelectric Ceramic
frequency variation would be limited. Devices & Quartz Crystals
Chequers Electronic (China) Ltd
Voltage controlled
crystal oscillators
Voltage controlled crystal oscillators
(VCXOs) enable fine adjustments of
output frequencies through changing the
voltage of control pins of oscillators. They
are suitable for applications that require an
accurate external reference. The oscillator
circuits with a given voltage change Crystal oscillators (Model DOC5204)
influence the amount of frequency shift. • High-stability solution OCXO for CDMA, VSAT and
switching applications
In most cases, varactor diodes are utilized • Temperature drift: 0.2ppb
• Ageing: less than 20ppb per year
to vary the frequency by changing • Phase noise: -120dBc/Hz at 10Hz
the capacitance across their terminals • Ageing: less than 500ppb per year
based on the DC voltage across the • Package: metallic through-hole 50mm x 50mm x 38mm
same terminals. Only a small range of Shenzhen Nearzenith Technologies Co Ltd
frequencies, however, can be varied by
these oscillators due to the limitations
imposed by high Q factor of crystals.
Temperature
compensated crystal
oscillator
Temperature compensated crystal
oscillator (TCXO) adjusts the frequency
for temperature variation. In order to
compensate for the aging of the crystal
over time, they generally have an outside
adjustment for setting the calibration
frequency periodically. Depending on
the level of accuracy required, the period
between calibrations might range from
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4. ComponentsM
Crystal Resonators
• HC series, SMD series,
DIP series, VCXO, TCXO
• Rohs, compliant
• No Pb
Anhui Safe Electronics Co Ltd
Crystal Resonator
• Compact and thin (3.2× 2.5× 0.65mm typ)
• Both sides supporting structure
advantageous to shock resistance
• Excellent for applications in mobile
communications
• Frequency Range: 12.000MHz~50.000MHz
• Frequency tolerance: ± 30ppm Max
• Storage temperature range: -40º to +85º
C C
• Load capacitance: 9pF typ
Wuhan HDC Technology Co Ltd
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5. ComponentsMarketplaceSpecialReport:Crystals|March2011
Crystals Laptop Battery
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Quartz Crystal Resonators
(SMD)
• All quartz enclosure
• Frequency available from
3.2768MHz ~ 50MHz
• Initial tolerance up to
±20ppm
• RoHS compliant
• Lead free reflow solderable
• Package sizes available from
3.2x2.5mm to 10x4.5mm
Interquip Electronics Company Ltd
Piezoelectric Ceramic
Devices & Quartz Crystals
Chequers Electronic (China) Ltd
Crystal oscillators (Model DOC5525)
• Designed for test & measurement,
switches, GPS synchronization
applications, VSAT and DAB
infrastructure
• Cost effective OCXO solution
• Temperature drift: less than 200ppb Dip-14 Oscillator
• Phase noise: -90dBc/Hz at 10Hz Gen-Worldly Quartz Crystal Co Ltd
• Ageing: less than 500ppb per year
• Package: 25.4mm x 22mm x 10mm
Shenzhen Nearzenith Technologies Co Ltd
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6. ComponentsM
Dip-8 Oscillator
HC49/U Quartz crystal Gen-Worldly Quartz Crystal Co Ltd
Gen-Worldly Quartz Crystal Co Ltd
High-temp Crystal Oscillator
• Frequency Range: 32.768K-160.000M
• Frequency Stability: 25PPM
• Supply Voltage: 3.3v 5.0v
• Current: 25-90MA
• TS: 10MS
• TR/TF: 10NS
• Operation Temperature: -40º C~175ºC
• Storage Temperature: -40º C~70ºC
• Symmetry: 45%-55%
• Output Load: 10TTL/HCMOS
• Dimensions: 20mmx 13.2mmx 5.5mm &13.2mmx 13.2mmx 5.5mm
Wuhan HDC Technology Co Ltd
Crystal oscillators (Model DOC5383)
• Cost-effective SC-cut OCXO
• Temperature drift: 10ppb
• Phase noise: -120dBc/Hz at 10Hz
• Ageing: less than 100ppb per year
• Package: metallic through-hole
36mm x 26mm x 18mm
Shenzhen Nearzenith Technologies Co Ltd
once a month to once a year. A TCXO has a larger size, oscillator, as it requires periodical calibrations, a separate
higher cost and longer start-up time than a clock oscillator. power supply for the heater and isolation between
building blocks.
Oven controlled crystal oscillator
Combination of crystal oscillators
Oven controlled crystal oscillator (OCXO) stabilize
frequency variations with an oven. In the instrumentation Meeting the needs of special applications, combinations
market, they are popular timing standards in measurement like Temperature Compensated, Voltage Controlled
equipments such as frequency counters, spectrum Crystal Oscillator (TCVCXO) and Oven Controlled,
analyzers and network analyzers. Every oven contains Voltage Controlled Crystal Oscillator (OCVCXO) have
at least a sealed crystal. The oven temperature must be been developed. These designs are gaining popularity
higher than the maximum ambient temperature expected in applications that previously require several different
in the application in order to maintain control. The cost oscillators, as various dividers can produce various output
and overall size of an OCXO is about 40 times of a clock frequencies.
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7. ComponentsMarketplaceSpecialReport:Crystals|March2011
Crystals CONTACT INFORMATION
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Anhui Safe Electronics Co Ltd Interquip Electronics Company Ltd
Address: North of Weiyi Road, Shizishan Economic Address: Flat A, 9/F, On Shing Industrial Building, 2-16
Development Zone, Tongling, Anhui, China Wo Liu Hang Road, Fotan, New Territories, Hong Kong
Tel: +86 (0562) 2828 608; +86 (0562) 2828 238 Tel: +852 2413 5515
Fax: +86 (0562) 2828 708; +86 (0562) 2855 972 Fax: +852 2413 7053
E-mail: anhuigr@hotmail.com E-mail: iql@interquip.com
Homepage: www.anhuisafe.com Homepage: www.interquip.com
Chequers Electronic (China) Ltd Shenzhen Nearzenith Technologies Co Ltd
Address: 5/F, 51Building, 5 QiongYu Road, High-tech
Address: Room 1101-3, Mongkok Commercial Centre, 16
Argyle Street, Mongkok, Kowloon, Hong Kong Industrial Park, Nanshan District, Shenzhen, China
Tel: +852 2391 6725 Tel: +86 (755) 8610 0308; +86 (755) 8610 0942
Fax: +852 2789 3205 Fax: +86 (755) 8610 1078
E-mail: info@chequers-electronic.com E-mail: mail@nearzenith.com
Homepage: www.chequers-electronic.com Homepage: www.nearzenith.com
Gen-Worldly Quartz Crystal Co Ltd Wuhan HDC Technology Co Ltd
Address: Unit 403-404, 4/F, Sun Ling Plaza, 30 On Kui Address: International Business Center (3rd), Jinfeng
Street, On Lok Tsuen, Industrial Area, Fanling, New Building A305, Donghu Hi-Tech Development Zone,
Territories, Hong Kong Wuhan, Hubei, China
Tel: +852 2675 8976 Tel: +86 (27) 8774 5207
Fax: +852 2675 4792 Fax: +86 (27) 8759 2096
E-mail: sales@gen-worldly.com.hk E-mail: wuhanhdc@hotmail.com
Homepage: www.gen-worldly.com.hk Homepage: www.wuhanhdc.com
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