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參數(shù)資料
| 型號： | EPT7088 |
| 廠商： | PCA Electronics Inc. |
| 英文描述： | Token Ring Interface Module |
| 中文描述： | 令牌環(huán)接口模塊 |
| 文件頁數(shù)： | 2/2頁 |
| 文件大小： | 52K |
| 代理商： | EPT7088 |
Token Ring Transceiver Module
Typical Application Circuit Connection to TMS38054 (or Equivalent)
E L E C T R O N I C S I N C .
EPT7088
The circuit below is a guideline for interconnecting PCA’s EPT7088 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 “current source” driver such as TMS38054.
Typical insertion loss of the isolation transformer is 0.5dB up to 16 MHz. The Toek Ring filter design follows the I.E.E.E
802.5 last recommendations in the Standard regarding the differential phase delay and the return loss right up to the filter
cut off frequency. This module requires either a receiver module with only isolation transformer/common mode choke
combination(such as the EPT7089) or another module identical to the EPT7088 to complete the transceiver operation.
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 EPT7088. There need not be any ground plane beyond
this point.
For best results, PCB designer should design the outgoing traces preferably to be 50
, balanced and well coupled to
achieve minimum radiation from these traces.
Notes : Phantom returns are left unconnected. Applications vary. Your system may have a phantom drive return
detection circuit needing pins 7 & 6 to be connected separately. Receiver CT can be grounded via a cap.
CST7088 Rev. 1 1/19/99
TEL: (818) 892-0761
FAX: (818) 894-5791
http://www.pca.com
PCA ELECTRONICS, INC.
16799 SCHOENBORN ST.
NORTH HILLS, CA 91343
TMS38054
RJ45
4
5
3
6
RCVINA 38
PHOUTA 29
50
/2W
50
/2W
EPT7088
1
6
15
9
8
3
3
+5V
RCVINB 37
PHOUTB 27
DROUTA 32
DROUTB 31
11
2
3
16
1
5v
+5V
+5V
10μF
10μF
Use only
one connector
8
7
1
2
14
8
5
7
6
PH RET A
PH RET B
CT
1
4
2
EPT7089
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PDF描述 |
|---|---|
| EPT7090 | Token Ring Transmitter Module |
| EPT7099S | Token Ring Transformer Module |
| EPZ3002G | Power Choke |
| EPZ3004G | Power Choke |
| EPZ3005G | Power Choke |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| EPT7090 | 制造商:PCA 制造商全稱:PCA ELECTRONICS INC. 功能描述:Token Ring Transmitter Module |
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| EPT7100G | 制造商:PCA 制造商全稱:PCA ELECTRONICS INC. 功能描述:Miniature Token Ring Transceiver Module |
| EPT7101G | 制造商:PCA 制造商全稱:PCA ELECTRONICS INC. 功能描述:Token Ring / Fiber Application Filter Module |
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