TOKEN
LT10.7M Ceramic Filters for FM Receiver
Ceramic Filters
for FM Receiver
(LT10.7M) Ceramic Filters
are Compatible Murata SFELF10M7
Preview
Token LT10.7M series are monolithic devices whichutilize
the energy-trapped thickness vibration-mode. This principle
of operation is based upon the fact that an excellent
resonating element with low spurious vibration can be
obtained by adhering to certain theoretical parameters of
design. These parameters include the physical dimensions
of the peizo element, the electrode pattern, and the associated
mass loading effect of the electrodes.
Token categorizes the LT 10.7 family according to rank of
center frequency. This ranking indicates that a given LT 10.7
will be marked with one of the colors listed in the following
chart and will exhibit the center frequency in Technical
Characteristics Table.
The LT10.7M offers three series: LT10.7M for FM Receiver (Compatible Murata SFELF10M7), LT10.7M A10
Insertion Loss 2.5±2.0 db ~ 4.5±2.0 db (Compatible Murata SFELF10M7 A10), and LT10.7M Wide Band-width
950 kHz at 20dB/Narrow Band-width 95 kHz at 20dB (Compatible Murata SFELF10M7 DBS Receiver).
LT10.7M Narrow Band-width series features stable low spurious and temperature characteristics. This series
is suitable for European car-audio or AM up conversion use that needs narrow band characteristics are stable.
LT10.7M Wide Band-width series are specified to make up conventional ceramic filters which wider band
characteristics not obtained.
Custom parts are available on request. Token will also produce devices outside these specifications to meet
specific customer requirements,
please contact our sales for more information.
Applications
- Change in center frequency is typically within ±30ppm/°C at -20°C to +80°C.
- Various band widths are available for applications in wide to narrow bands.
- Low loss, favorable waveform symmetry, and high selectivity.
- These miniature filters have high mechanical strength.
- Excellent shape factor of frequency response.
- Small dispersion and stable characteristics.
- Good waveform symmetry.
- High reliability.
Version 2010
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01 of 04
TOKEN
Dimensions
LT10.7M Ceramic Filters for FM Receiver
7.0±2.0
Color 2
4.0max
7.0±2.0
0.3±0.1
②
①
2.5±0.3
5.0±1.0
①
Input
②
Ground
③
Output
Color 1:A5,S2,JA10
Color 2:S3,HY
Color 1
L10.7A
2.5±0.3
0.5±0.1
③
2.5±0.3
FM Receiver (Murata SFE10M7 FM-IF Compatible) Technical Characteristics
Part
Number
LT10.7MA5
LT10.7MS2
LT10.7MS3
3dB Band Width
(kHz)
280±50
230±50
180±40
20dB Band Width
(kHz) max
650
600
520
Insertion Loss
(dB) max
6
6
7
Spurious Attenuation
(9-12MHz)(dB)min
30
40
40
Note:
Input/Ouput Impedance:330Ω
Low - Loss Type (Murata SFE10M7 A10 Compatible) Technical Characteristics
PartNumber
LT10.7MA5A10
LT10.7MS2A10
LT10.7MS3A10
LT10.7MJA10
3dB Band
Width(kHz)
280±50
230±50
180±40
150±40
20dB Band
Width(kHz) max
590
520
470
360
Insertion Loss(dB)
2.5±2.0
3.0±2.0
3.5±1.5
4.5±2.0
Spurious
Attenuation
(9-12MHz)(dB)min
30
35
35
35
Note:
Input/Ouput Impedance:330Ω
Wide/Narrow Band-width (Murata SFE10M7 DBS Receiver Compatible) Technical Characteristics
Part
Number
LT10.7MA19
LT10.7MA20
LT10.7MHY
LT10.7MFP
3dB Band Width
(kHz)
350min
330±50
110±30
20min
20dB Band Width
(kHz) max
950
680
350
95
Insertion Loss
(dB)
3.0±2.0
4.0±2.0
7.0±2.0
6.0max
Spurious Attenuation
(9-12MHz)(dB)min
20
30
30
24(10.7±1.0MHz)
Note:
Input/Ouput Impedance:470Ω(MA19),330Ω(MA20,MHY),600Ω(MFP)
02 of 04
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Version 2010
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Characteristics
0
Attenuation(dB)
10
20
30
40
LT10.7M Ceramic Filters for FM Receiver
LT10.7MS2
Attenuation(dB)
LT10.7MS3
LT10.7MA5
Attenuation(dB)
0
10
20
30
40
0
10
20
30
40
10.3 10.5 10.7 10.9 11.1
Frequency(MHz)
10.3 10.5 10.7 10.9 11.1
Frequency(MHz)
10.3 10.5 10.7 10.9 11.1
Frequency(MHz)
Test Circuit
R
1
R
g
①
②
③
~
S.S.G
R
2
C
RF
V.M
Rg + R
1
= R
2
= 330 Ω
C
= 10pF
Including stray capacitance and input capacitance of RF voltmeter
1. When using ceramic filters, it is most important to match the input/output load to impedance 330 ohm
(LT10.7MA19 is 470 ohm matching). Waveform symmetry is damaged when reactance is added to
the input/output load.
2. Two ceramic filters directly connected can be used for high selectivity. For reducing waveform
variation, it is recommended to input a buffer AMP between ceramic filters.
3. The LT10.7M series are of input/output symmetric structure so that in theory there is no input/output
directionality. Actual circuits may use different input/output loading conditions (for example,
mismatched impedance) or capacitance load. In such cases, the waveform will be a little changed by
the direction of the input/output of the ceramic filters.
Version 2010
http://www.token.com.tw/
rfq token.com.tw
03 of 04
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