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參數(shù)資料
| 型號： | EPT7069G |
| 廠商： | PCA Electronics Inc. |
| 英文描述： | 120W Token Ring Front End Filter Module |
| 中文描述： | 120瓦令牌環(huán)前端濾波器模塊 |
| 文件頁數(shù)： | 2/2頁 |
| 文件大?。?/td> | 44K |
| 代理商： | EPT7069G |
CST7069Gb Rev. 1 7/7/98
120
Token Ring Front End Filter Module
Typical Application Circuit Connection to TI380C30 (or Equivalent)
E L E C T R O N I C S I N C .
EPT7069G
The circuit below is a guideline for interconnecting PCA’s EPT7069G with a typical Token Ring PHY chip for 4 Mb/16Mb
applications over STP or 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 TI380C series. Only one type of
cable should be driven by the module: either UTP or STP. This module is ideally suited for applications with only one RJ45
connector installed. Changing to STP is accomplished by using an adaptor without any need for additional impedance
transforming device embedded in it. The same approach is usable if one were to drive the European standard 120
cable,
which poses no problems.
Note that the receiver side filtering is identical, thus making it possible for use in a DTR application as well. Consider this a
cost effective solution for almost all Token Ring applications using this chip 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 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 pins of EPT7069G. There need not be any ground plane beyond
this point.
For best results, PCB designer should design the outgoing traces preferably to be 75
/50
, balanced and well coupled to
achieve minimum radiation from these traces.
Notes : 1. Suggested phantom circuit is for reference only. Applications Vary.
2. Phantom return on Rcv channel at pins 11 and 12 are not shown.
3. Your application may suffice by using an external inductor pulled to ground.
4. C* : Primary center taps may be pulled to ground by Caps to enhance common mode attenuation.
TI380C30
RJ45
4
5
3
6
Rcv+
PHOUTA
Chassis
Ground
1
2
3
12
11
Rcv-
PHOUTB
Xmit-
Xmit+
2
3
50
/2W
50
/2W
11
12
+5V
+5V
10μF
10μF
8
7
1
2
100
4
100
EPT7069G
13
10
6
4
Rcv Channe
l
EPT7069G
13
10
C*
6
4
Xmit Channe
l
Chassis
Ground
RU
TU
TEL: (818) 892-0761
FAX: (818) 894-5791
http://www.pca.com
PCA ELECTRONICS, INC.
16799 SCHOENBORN ST.
NORTH HILLS, CA 91343
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