CFM2/CFM3
AM CERAMIC FILTERS
August 2005
2005 TOKO America, Inc.
All Rights Reserved
Printed in USA
1
CF-313-CFM2/3
R-LOG0805A
Dimensions
TOKO America, Inc.
1250 Feehanville Drive, Mount Prospect, Illinois 60056
Tel: (847) 297-0070 Fax: (847) 699-7864 Web: http://
www.tokoam.com
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.
Test Circuit
Test Conditions
Description
Compact 2/3 element AM IF filter with
unique structure for high reliability.
Center frequency range: 450 to 470kHz
Bandwidth at 6dB: 4 to 12kHz. (4~8kHz: CFM3)
Features
Compact, low profile
High selectivity, suited to a wide range of applications
Low temperature coefficient
Low spurious response
Lead-free terminations
Applications
AM radio cassettes, stereo sets, telecommunications
Wireless data communication equipment
STANDARD FILTERS SELECTION GUIDE
TYPE CFM2/CFM3 (CERASIZER
)
TOKO Center Bandwidth Selectivity Ripple Insertion Input/Output
Part Frequency (Fo)* at 6dB at Fo±9kHz in Pass Band Loss Impedance
Number (kHz) (kHz) (dB)
(dB) (dB) (k
Ω
)
CFM2
##AHCFM2-450Z 450±1.0 4.0±1.0 24.0 min. 1.0 max. 7.0 max. 1.0/1.5
##AHCFM2-450AL 450±1.0 4.0 min. 18.0 min. 1.0 max. 6.0 max. 1.0/1.5
##AHCFM2-450BL 450±1.0 6.0 min. 16.0 min. 1.0 max. 6.0 max. 1.5/2.0
##AHCFM2-450CL 450±1.0 8.0 min. 12.0 min. 2.0 max. 6.0 max. 2.0/2.0
##AHCFM2-450DL 450±1.0 10.0 min. 9.0 min. 2.0 max. 6.0 max. 2.0/2.0
##AHCFM2-450EL 450±1.0 12.0 min. 6.0 min. 2.0 max. 6.0 max. 2.5/2.5
CFM3
##ACFM3-450AL 450±1.0 4.0 min. 28.0 min. 2.0 max. 6.0 max. 3.0/3.0
##ACFM2-450BL 450±1.0 5.5 min. 24.0 min. 2.0 max. 6.0 max. 3.0/3.0
##ACFM2-450CL 450±1.0 8.0 min. 20.0 min. 2.0 max. 6.0 max. 3.0/3.0
* Center frequencies 450kHz, 455kHz, 459kHz, 460kHz, 468kHz available. Center frequency tolerance available to ±0.5kHz.
1. C includes test circuit capacitance. (50pF without L
2
, 62pF with L
2
)
2.
L
1
2.7mH (CFM2), 1.35mH (CHM3)
L
1.0mH
3. During testing, when matching coils are used at input/output sides,
connect L
and L
(dummy)
4. R
, R
: Input-output impedance
Cs: Stray capacitance
(less than 50pF, including EV)
Unit: mm