CFM2/CFM3
AM CERAMIC FILTERS
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)
Dimensions
Features
• Compact, low profile
• High selectivity, suited to a wide range of applications
• Low temperature coefficient
• Low spurious response
• Lead-free terminations
Unit: mm
Applications
• AM radio cassettes, stereo sets, telecommunications
• Wireless data communication equipment
Test Circuit
Test Conditions
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
2
3. During testing, when matching coils are used at input/output sides,
connect L
1
and L
2
(dummy)
4. R
1
, R
2
: Input-output impedance
Cs: Stray capacitance
(less than 50pF, including EV)
STANDARD FILTERS SELECTION GUIDE
TYPE CFM2/CFM3 (CERASIZER
®
)
TOKO
Center
Part
Frequency (Fo)*
Number
(kHz)
CFM2
##AHCFM2-450Z
450±1.0
##AHCFM2-450AL
450±1.0
##AHCFM2-450BL
450±1.0
##AHCFM2-450CL
450±1.0
##AHCFM2-450DL
450±1.0
##AHCFM2-450EL
450±1.0
CFM3
##ACFM3-450AL
##ACFM2-450BL
##ACFM2-450CL
450±1.0
450±1.0
450±1.0
Bandwidth
at 6dB
(kHz)
4.0±1.0
4.0 min.
6.0 min.
8.0 min.
10.0 min.
12.0 min.
4.0 min.
5.5 min.
8.0 min.
Selectivity
at Fo±9kHz
(dB)
24.0 min.
18.0 min.
16.0 min.
12.0 min.
9.0 min.
6.0 min.
28.0 min.
24.0 min.
20.0 min.
Ripple
in Pass Band
(dB)
1.0 max.
1.0 max.
1.0 max.
2.0 max.
2.0 max.
2.0 max.
2.0 max.
2.0 max.
2.0 max.
Insertion
Loss
(dB)
7.0 max.
6.0 max.
6.0 max.
6.0 max.
6.0 max.
6.0 max.
6.0 max.
6.0 max.
6.0 max.
Input/Output
Impedance
(kΩ)
1.0/1.5
1.0/1.5
1.5/2.0
2.0/2.0
2.0/2.0
2.5/2.5
3.0/3.0
3.0/3.0
3.0/3.0
* Center frequencies 450kHz, 455kHz, 459kHz, 460kHz, 468kHz available. Center frequency tolerance available to ±0.5kHz.
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-313-CFM2/3
R-LOG0805A
1
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