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參數(shù)資料
| 型號： | EPT7039GM |
| 廠商： | PCA Electronics Inc. |
| 英文描述： | Token Ring Transceiver Module |
| 中文描述： | 令牌環(huán)收發(fā)模塊 |
| 文件頁數(shù)： | 2/2頁 |
| 文件大?。?/td> | 71K |
| 代理商： | EPT7039GM |
CST7039GMb Rev. 10/17/96
Token Ring Transceiver Module
Typical Application Circuit Connection to TMS38054 (or Equivalent). For NIC.
E L E C T R O N I C S I N C .
EPT7039GM
The circuit below is a guideline for interconnecting PCA’s EPT7039GM 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 “current source” driver such as TMS38054. Only one type of cable should be driven by
the module: either UTP or STP. If you are using 120
cable or desire to install only one RJ45 connector thus leaving the STP
use with a dongle when needed, please refer to PCA part numbers EPT7066 or similar parts optimized for 120
cable.
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 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 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 pins of EPT7039GM. 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
, (as the case may be) balanced
and well coupled to achieve minimum radiation from these traces.
Notes : 1. Pins 5 & 6 are left unconnected. Applications vary. Your system may have a phantom
drive return detection circuit needing pins 5 & 6 to be connected separately.
2. Red line connections to DB-9 Connector are 75
impedance traces.
TMS38054
RJ45
4
5
3
6
RCVINA
PHOUTA
N/C
50
2W
50
2W
EPT7039GM
1
4
2
1
6
13
5(B)
9(O)
DB-9
Connector
21
23
22
20
19
16
15
18
17
3
3
+5V
RCVINB
PHOUTB
DROUTA
DROUTB
14
11
12
10
+5V
+5V
+5V
10
μ
F
10
μ
F
Use only
one connector
1(R)
6(G)
8
7
1
2
Vcc1
PHA
3
Rcv
±
Xmit
±
5
PHB
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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