LFC/LFCM
AM CERAMIC FILTERS
Description
• AM Ceramic filters are connected in a ladder structure
and are available as either 4/6 element devices
• Bandwidths from 6 to 30 kHz
Dimensions
Features
• 450, 455 kHz, (460kHz and 486kHz by special request)
• High selectivity
• Compact package
• Version with group delay variations specified also available
• Lead-free terminations
LFC
Unit: mm
Applications
• AM radio cassettes, AM stereo sets
• Cordless telephones, pagers
• Two-way radios
LFCM
Unit: mm
STANDARD FILTERS SELECTION GUIDE
TYPE LFC/LFCM
TOKO
Part
Number
LFC
ALFC455H
ALFC455G
ALFC455F
ALFC455E
BLFC455D
BLFC455C
BLFC455B
LFCM
ALFCM455H
ALFCM455G
ALFCM455F
ALFCM455E
BLFCM455D
BLFCM455C
BLFCM455B
Center *
Frequency
(kHz)
455±1.0
455±1.0
455±1.0
455±1.0
455±2.0
455±2.0
455±2.0
455±1.0
455±1.0
455±1.0
455±1.0
455±2.0
455±2.0
455±2.0
Bandwidth
at 6 dB
(kHz)
±3.0 min.
±4.5 min.
±6.0 min.
±7.5 min.
±10.0 min.
±12.5 min.
±15.0 min.
±3.0 min.
±4.5 min.
±6.0 min.
±7.5 min.
±10.0 min.
±12.5 min.
±15.0 min.
Bandwidth
at 40 dB
(kHz)
±9.0 min.
±10.0 min.
±12.5 min.
±15.0 min.
±20.0 min.
±24.0 min.
±30.0 min.
±9.0 min.
±10.0 min.
±12.5 min.
±15.0 min.
±20.0 min.
±24.0 min.
±30.0 min.
Attenuation
fo ± 100 KHz
(dB)
25.0 max.
25.0 max.
27.0 max.
27.0 max.
27.0 max.
27.0 max.
27.0 max.
25.0 max
25.0 max
27.0 max
27.0 max
27.0 max
27.0 max
27.0 max
Insertion
Loss
(dB)
6.0 max.
6.0 max.
6.0 max.
6.0 max.
4.0 max.
4.0 max.
4.0 max.
6.0 max.
6.0 max.
6.0 max.
6.0 max.
4.0 max.
4.0 max.
4.0 max.
Input/Output
Impedance
(kΩ)
2.0
2.0
2.0
1.5
1.5
1.5
1.5
2.0
2.0
2.0
1.5
1.5
1.5
1.5
* For 450kHz, substitute 450 for 455 in part number.
August 2005
© 2005 TOKO America, Inc.
All Rights Reserved
Printed in USA
CF-317-LFC/M
R-LOG0805A
1
LFC/LFCM
AM CERAMIC FILTERS
Frequency Response
LFC / LFCM (4 element)
0
20
Attenuation (dB)
40
60
80
C
E
H
Bandwidth
Rank:
C = ±12.5kHz
E = ±7.5kHz
H = ±3kHz
100
415 425 435 445 455 465 475 485 495
Frequency (kHz)
Test Circuit
Test Conditions
1. C includes test circuit capacitance.
2. R
1
, R
2
: Input-output impedance
Cs: Stray capacitance
(less than 50pF, including EV)
LFC
Test circuit
R1
50Ω
SG.
Rg
E1
1
3
2
R2
E2
E.V.
Z = Rg + R1 =R2
LFCM
Test circuit
R1
50Ω
SG.
Rg
1
2
3
E1
4
R2
E2
E.V.
Z = Rg + R1 =R2
The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture
of its products without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or
other rights of third parties which may result from the use of its products. No license is granted by implication or otherwise under any patent or patent rights of TOKO, Inc.
TOKO America, Inc.
1250 Feehanville Drive, Mount Prospect, Illinois 60056
Tel: (847) 297-0070 Fax: (847) 699-7864 Web: http://www.tokoam.com
August 2005
© 2005 TOKO America, Inc.
All Rights Reserved
Printed in USA
CF-317-LFC/M
R-LOG0805A
2
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