EPT7055A [PCA]
Token Ring Transceiver Module; 令牌环收发模块
| 型号： | EPT7055A |
| 厂家： | 
PCA ELECTRONICS INC. |
| 描述： | Token Ring Transceiver Module |
| 文件： | 总2页 (文件大小：34K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Token Ring Transceiver Module
EPT7055A
E L E C T R O N I C S I N C .
• Optimized for voltage source driving into 150Ω •
• Enhanced Common Mode performance over UTP •
• Robust construction allows for solder reflow processes •
• Complies with or exceeds IEEE 802.5 Requirements •
Electrical Parameters @ 25° C
Impedance
(Ω)
Insertion Loss
Return Loss
(dB Min.)
Common Mode Rejection
Crosstalk
(dB Min.)
(dB Min.)
(dB Min.)
[Rcv]
10
MHz
Chip Side
1-16
MHz
32
MHz
36
MHz
1-6
MHz
6-17
MHz
17-24
MHz
1-30
MHz
30-100
MHz
100-200
MHz
44
MHz
150
Cable Side
Xmit Rcv Xmit Rcv Xmit Rcv
Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv
Xmit Rcv
-30 -3
100
-.6* -.5*
-7
-1 -25 -3
-18 -23 -18 -20
Schematic
1 : .817
-8 -10 -57 -40 -35 -35 -20 -20
-50
* dB Max.
TX1+ 2
14 TXO+
13 TXO-
LPF
150Ω
TX1- 4
9 PHA
UTP
CT- 5
12 RX1+
RX0+ 6
150Ω
11 RX1-
10 PHB
RX0- 8
1 : .817
RXCT 7
Dimensions
Package
(Inches)
Dim. Min. Max. Nom.
(Millimeters)
Min. Max. Nom.
A
A
B
C
D
E
F
G
H
I
1.480 1.500
37.60 38.10
B
.255
.440
.275
.460
6.48
6.99
11.43 11.68
33.02 Typ.
1.300 Typ.
Pin 1 I.D.
.010
.100
.130
.020
.010°
.127
.015
Typ.
.150
.024
Typ.
.137
.254
3.18
3.30
.508
.254
3.23
.381
Typ.
3.81
.610
Typ.
3.48
PCA
EPT7055A
Date Code
C
E
J
G
H
F
I
D
J
CST7055Aa Rev. D 6/2/97
PCA ELECTRONICS, INC.
16799 SCHOENBORN ST.
NORTH HILLS, CA 91343
TEL: (818) 892-0761
FAX: (818) 894-5791
http://www.pca.com
Product performance is limited to specified parameters. Data is subject to change without prior notice.
Token Ring Transceiver Module
EPT7055A
E L E C T R O N I C S I N C .
The circuit below is a guideline for interconnecting PCA’s EPT7055A 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 EPT7055A. 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
12
11
5
4
38
37
6
8
Xmit±
Rcv±
RJ45
RCVINB
14
13
3
6
+5V
+5V
1
2
7
8
50Ω/2W
50Ω/2W
PHOUTA
PHOUTB
9
29
27 10µF
10
10µF
TMS38060
DROUTB
DROUTA
31
32
2
4
100Ω
100Ω
11
EPT7055A
Common Mode
7
5
Notes : 1. Current limiting resistors R1 & R2 are included in this package.
CST7055Ab Rev. D 6/2/97
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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