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COMMON MODE CHOKE
For Fibre Channel, Gigabit Ethernet, and IEEE 1394 Applications
Common Mode Attenuation from 200 MHz to 2.5 GHz Reduces radiated emissions and improves noise immunity 235C Peak Reflow temperature rating Surface mount, auto-insertable package Industrial temperature range
Electrical Specifications @ 25C -- Operating Temperature -40C to +85C
Part Number A1801 Common Mode Attenuation (dB TYP) 1.0GHz 1.5GHz -11.0 -10.0 Primary Inductance OCL (H MIN) 3.0 DCR ( MAX) .15
200 MHz -11.0
500MHz -11.0
2.0GHz -9.0
2.5GHz -7.5
Mechanical
A1801
.075 1,90 .290 MAX 7,37 .340 .190 8,64 4,83 .240 MAX 6,10
Date Code Rev Country of Origin
Schematic
1.50 3,81 .050 1,27
1
.030 0,76
8
4
5
.150 MAX 3,81 .004 / 0,10 8 SURFACES
.035 8X 0,89
.050 1,27 TYP
Dimensions: Inches mm Unless otherwise specified, all tolerances are .005 0,13
Weight . . . . . . .0.2 grams (max) Tape & Reel . . . . . . . .1750/reel Tube . . . . . . . . . . . . . . .80/tube
US 858 674 8100 * UK 44 1483 401 700 * France 33 3 84 35 04 04 * Singapore 65 6287 8998 * Taiwan 886 2 2698 0228 * Hong Kong 852 2788 6588 * http://www.pulseeng.com
A104.A (1/04)
COMMON MODE CHOKE
Application Notes:
For Fibre Channel, Gigabit Ethernet, and IEEE 1394 Applications
1. Values for R1 and R2 are determined by system transmit amplitude requirements. A value of 0 for R1 and R2 will yield an output with maximum amplitude but distorted due to impedance mismatch. A value of 68 will provide an optimum waveform but have 6.0 dB insertion loss. If 6.0dB loss is too great, select at least 15 to obtain a reasonable compromise between insertion loss and waveshape. The typical value for C1, C2, C3, and C4 is 0.1F. 2. To maintain return loss and signal integrity, transmission line methods must be used when designing the PCB. For best performance the common mode choke should be located no more than 1" from the cable connector. 3. One example of a possible layout is shown below for a Fibre Channel application. Note that actual board layouts will vary based upon specific applications and EMC considerations.
Typical Fibre Channel 150 Application:
C3
GND
EARTH GND
Vcc
TX+ TX-
GND
R1 C1 TX+
120 200
A1801
DATE REV
TX-
120 200
R2
C2
SERDES CHIP SET
Vcc
GND
C3
HSDCC or DB9 CONNECTOR
RXRX+
150 C4
A1801
DATE REV
RX-
75 W Transmission Lines GND
RX+
EARTH GND
C4
Test Circuit, Common Mode Attenuation:
D.U.T. 75 W NETWORK ANALYZER
For More Information :
UNITED STATES (Worldwide)
12220 World Trade Drive San Diego, CA 92128 U.S.A. http://www.pulseeng.com TEL: 858 674 8100 FAX: 858 674 8262
UNITED KINGDOM (Northern Europe)
1 & 2 Huxley Road The Surrey Research Park Guildford, Surrey GU2 5RE United Kingdom TEL: 44 1483 401700 FAX: 44 1483 401701
FRANCE SINGAPORE (Southern Europe) (Southern Asia)
Zone Industrielle F-39270 Orgelet France TEL: 33 3 84 35 04 04 FAX: 33 3 84 25 46 41 150 Kampong Ampat #07-01/02 KA Centre Singapore 368324 TEL: 65 6287 8998 FAX: 65 6280 0080
TAIWAN, R.O.C. (Northern Asia)
3F-4, No. 81, Sec. 1 HsinTai Wu Road Hsi-Chih, Taipei Hsien Taiwan, R.O.C. Tel: 886 2 2698 0228 FAX: 886 2 2698 0948
HONG KONG (China/Hong Kong)
9/F, Phase 2, Tai Sang Shatin Warehouse Centre 6 Wong Chuk Yeung Street Fotan, Shatin, Hong Kong TEL: 852 2788 6588 FAX: 852 2776 1055
DISTRIBUTOR
Performance warranty of products offered on this data sheet is limited to the parameters specified. Data is subject to change without notice. Other brand and product names mentioned herein may be trademarks or registered trademarks of their respective owners. Printed on recycled paper. (c)2004, Pulse Engineering, Inc.
A104.A (1/04)

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