EPT7055AM

更新时间： 2024-02-12 03:31:05

品牌	Logo	应用领域
PCA		/
页数	文件大小	规格书
2页	34K
描述
Token Ring Transceiver Module

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EPT7055AM 数据手册

Token Ring Transceiver Module

EPT7055AM

E L E C T R O N I C S I N C .

The circuit below is a guideline for interconnecting PCA’s EPT7055AM with a typical Token Ring PHY chip for 4 Mb/16Mb

applications over UTP cable. Further details of system design should be obtained from the specific chip manufacturer.

Note that this module is optimized for a “voltage source” driver such as TI380C60.

Typical insertion loss of the isolation transformer is 0.5dB up to 16 MHz. Under terminated conditions, to transmit a 2V pk-

pk signal across the cable, you must adjust the specific chip preset template control resistors to get at least 2.12V pk-pk

across the transmit input pins.

Note that there is no need for the receiver side filtering. So consider this a cost effective solution for almost all Token Ring

applications using this or similar chips.

The pull down resistors to chassis via a cap shown around the RJ45 connector have been known to suppress unwanted

radiation that unused wires pick up from the immediate environment. This is specially true if driving UTP cable. Their

placement and use are to be considered carefully before a design is finalized.

No specific recommendation is made here for phantom return circuitry: implementation varies. Please note that additional

emission control has been observed if both nodes of the phantom bypass capacitor on the transmit channel are pulled to

the chassis ground via suitable capacitors.

It is recommended that there be a neat separation of ground planes in the layout. It is generally accepted practice to limit

the plane off at least 0.05 inches away from the chip side of EPT7055AM. There need not be any ground plane beyond this

point.

For best results, PCB designer should design the outgoing traces preferably to be 50Ω, balanced and well coupled to

achieve minimum radiation from these traces.

Typical Application Circuit Connection to TI380C60 (or Equivalent)

RCVINA

Xmit±

Rcv±

RJ45

RCVINB

+5V

50Ω/2W

PHOUTA

PHOUTB

27 10µF

10µF

TMS38060

DROUTB

DROUTA

100Ω

EPT7055AM

Common Mode

Notes : 1. Current limiting resistors R1 & R2 are included in this package.

CST7055AMb Rev. A 6/11/97

PCA ELECTRONICS, INC.

16799 SCHOENBORN ST.

NORTH HILLS, CA 91343

TEL: (818) 892-0761

FAX: (818) 894-5791

http://www.pca.com

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