CFM2/CFM3

AM CERAMIC FILTERS

August 2005

1

© 2005 TOKO America, Inc.

All Rights Reserved

Printed in USA

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

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)

(kΩ)

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

•

L

3. During testing, when matching coils are used at input/output sides,

connect L

4. R

Cs: Stray capacitance

(less than 50pF, including EV)

Unit: mm