TOKEN
CERAMIC
FILTERS
Filters for FM ,TV/VCR Stage, Communication
Token Electronics Industry Co., Ltd
.
Taiwan:
No. 137, Sec. 1, Chung Shin Rd., Wu Ku Hsiang, Taipei Hsien, Taiwan, R.O.C
TEL: 886-2-2981 0109; FAX: 886-2-2988 7487
China:
12F, Zhongxing Industry Bld., Chuangye Rd., Nanshan District, Shenzhen, Guangdong
TEL: 86-755-2605 5363, 2605 5364; FAX: 86-755-2605 5365
http://www.token.com.tw
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Product Index
Information
Introduction of Filters -------------------------------------------------------------------------- 01
Terminologies of Filter Characteristic Properties ------------------------------------ 02
Ceramic Filters for FM Series
Chip Ceramic Filters - LTCS10.7M Series ------------------------------------------------ 05
SMD Ceramic Filters for AM - LTCA/CV10.7M Series -------------------------------- 07
Ceramic Filters - LT10.7M Series ------------------------------------------------------------ 09
Ceramic Filters - LT10.7M A10 Series ------------------------------------------------------ 09
Ceramic Filters - LT10.7M Series ------------------------------------------------------------ 09
Ceramic Filters for for TV/VCR Stage
Ceramic Filters - LT MB Series -------------------------------------------------------------- 13
Ceramic Filters - LTT MA Series ------------------------------------------------------------ 16
Ceramic Filters - LTS MCB/MDB Series --------------------------------------------------- 19
Ceramic Filters for for TV/VCR Stage
LTC 455/450 Series - Surface Mountable ------------------------------------------------- 22
LTM 455/450 Series - Miniaturized Versions -------------------------------------------- 25
LT 455/450 U/W Series - G.D.T. Characteristics ----------------------------------------- 28
LTP Series - for Standard AM Filtering --------------------------------------------------- 31
LTZ Series - for AM ----------------------------------------------------------------------------- 34
MLT Series - Miniature for AM --------------------------------------------------------------- 37
LTB Series - Shrinking Mobile Communication --------------------------------------- 39
LTA Series - for Radio Cassette Recorder ---------------------------------------------- 42
LZU Series - Search-Stop Signal Detection --------------------------------------------- 45
Notice:
Specification Changed or Version Updated will be posted at irregular intervals.
All Updated and Final Specifications, Please Confirm with TOKEN ELECTRONICS
REPRESENITIVES.
:
:
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Information of Ceramic Filters
Information of
Ceramic Filters
Introduction of Filters
For more than two decades, piezo technology has been instrumental in the proliferation of solid state
electronics. A view of the future reveals that even greater expectations will be placed on piezoelectric
material in the area of new applications and for more stringent performance criteria in modern
products.
The IC (Integrated Circuit) has found wide use in the field of commercial equipment, such as
automotive radios, stereo systems, 2-way communications, TV sets, etc. Thus, new miniature
integrated filters, with high performance, are extremely desirable for use in IF circuits.
Furthermore, radio wave disturbance due to rapid progress of data transmitting rate and remarkable
sophistication of communication network have become significant traffic conflicts. Accordingly,
the demand for filters with high selectivity and wide pass band width has boosted.
The IC application of the active elements will continue its progress, and there will be a growing
demand for highly selective, non-adjustable, miniature and wide pass band width IF circuit.
Advantage of Token Piezoelectric Filters
Token Electronics had been able to develop specialized piezo materials which when combined with
an advance design have resulted in a complete line of practical, inexpensive piezo devices for
entertainment and communications applications.
Token reliably deliver high-quality components according to the each customer special needs with
respect to performance, costs, and technology modifications.
For marketing discontinuations or sourcing activities concerning Piezoelectric Filter products, you
are encouraged to contact our Sales Department so the request can be properly directed within Token.
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Filter Terminologies
Terminologies of
Filter Characteristic
Properties
What is Ceramic Filter
Ceramic filter is a filter which uses a piezoelectric ceramics as an electrical-mechanical transducer and as
a mechanical resonator. It provides simultaneously the electrical and the mechanical system within a single
element
Input Level
[dB]
0
Attenuation
3
(or 6)
Center Frequency
Pass Band Width
Insertion Loss
Ripple
Attenuation Band Width
(dB band width)
Selectivity
Spurious Response
Spurious
20
(or 60)
Frequency
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What is Ceramic Filter
Filter Terminologies
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Center Frequency (Symbol: f0; Unit: Hz)
It signifies the frequency in the center of the pass band width. However, the center frequency for
some product is expressed at the point where the loss is minimum.
Pass Band Width (Symbol: PBW; Unit: Hz)
Signifies a difference between the two frequencies where the attenuation becomes 3dB from the
level of the minimum loss point.
Insertion Loss (Symbol: IL; Unit: dB)
Expressed in the input and output level ratio at the point of minimum loss in dB. The insertion loss
for some product is expressed in the input and output level ratio at the center frequency.
Ripple (Unit: dB)
If there are peaks and valleys in a pass band width, the ripple expressed the level difference of
voltage between the maximum peak and minimum valley and it is expressed in dB.
●
Attenuation Band Width (Symbol: ABW; Unit: Hz)
Signifies a difference between the two frequencies where the attenuation becomes the specified
values (dB) from the level of minimum loss.
(Example: Expressed at a point where the attenuation becomes 20 dB in case of 10.7 MHz filter.)
●
Selectivity (Unit: dB)
Expressed as the attenuation of the detuning point from the center frequency.
(Example: The attenuation that ±9 kHz was detuned from the center frequency in case of 455 kHz
filter.)
●
Spurious Response (Symbol: sp; Unit: dB)
Expressed as the difference of voltage ratio between minimum attenuation point in the stop band
range and minimum loss point in the pass band width by using dB (The stopped range is specified
with each filter).
●
Spurious
Signifies the frequency response based on the parasitic (unwanted) vibration against the frequency
except the fundamental vibration.
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