EPT7076 [PCA]
Token Ring Transceiver Module; 令牌环收发模块
| 型号： | EPT7076 |
| 厂家： | 
PCA ELECTRONICS INC. |
| 描述： | Token Ring Transceiver Module |
| 文件： | 总2页 (文件大小：35K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Token Ring Transceiver Module
EPT7076
E L E C T R O N I C S I N C .
• Optimized for voltage source driving into 150 ohms •
• 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)
[Xmit/Rcv]
Insertion Loss
Return Loss
(dB Min.)
Common Mode Rejection
Crosstalk
(dB Min.)
(dB)
(dB Min.)
1-30
MHz
Chip Side
1-16
MHz
32
MHz
36
MHz
1-6
MHz
6-17
MHz
17-25
MHz
1-30
MHz
30-100
MHz
100-200
MHz
200-300
MHz
44
MHz
150
Max.
Min. Max. Min. Max. Min. Max.
Cable Side Xmit Rcv Xmit Rcv Xmit Rcv
Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv
Xmit Rcv
Xmit Rcv
100
-.8 -.5
-7
-1 -25 -3 -30 -3 -18 -23 -12 -20
-8 -10 -50 -40 -35 -35 -30 -30 -20 -20
12 TPHB
-38
Schematic
20 TXOUT
TX1+ 9
100 Ω
150Ω
TXCT 11
TX1- 10
FIN 1
4 FOUT
5 FOUT
19 TXOUTL
13 TPHA
15 RPHB
18 RXIN
LPF
150Ω
150Ω
FINL 2
RX0+ 6
RXCT 8
FGND 3
100 Ω
150Ω
17 RXINL
14 RPHA
RX0- 7
Package
A
Dimensions
(Inches)
Dim. Min. Max. Nom.
(Millimeters)
B
Min. Max. Nom.
A
B
C
D
E
F
G
H
I
1.090 1.110
27.69 28.19
.260
.380
.950
.010
.050
.135
.016
.008
.075
.130
.100
.280
.400
Typ.
.030
Typ.
Typ.
.022
.012
Typ.
.150
Typ.
6.60
7.11
Pin 1 I.D.
9.65 10.16
24.13 Typ.
PCA
EPT7076
Date Code
.254
1.27
3.43
.406
.203
1.91
3.30
2.54
.762
Typ.
Typ.
.559
.305
Typ.
3.81
Typ.
E
C
J
J
L
I
K
F
K
L
G
H
D
CST7076a Rev.B 4/1/98
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
EPT7076
E L E C T R O N I C S I N C .
The circuit below is a guideline for interconnecting PCA’s EPT7076 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.
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 EPT7076. There need not be any ground plane beyond this
point.
For best results, PCB designer should design the outgoing traces preferably to be 50 ohms, balanced and well coupled to
achieve minimum radiation from these traces.
Typical Application Circuit Connection to TI380C60 (or Equivalent) For NIC.
Rcv+
18
17
6
7
4
5
3
6
Rcv±
RJ4
5
PH-B
PH-A
Rcv-
15
14
20
19
Xmit±
+5V
+5V
1
2
7
8
50Ω/2W
PHOUTA
PHOUTB
13
8
3
50Ω/2W
12
10µF
10µF
4
9
5
TI380C60
EPT7076
10
1
Xmit+
Xmit-
100Ω
100Ω
11
2
Notes : 1. Pins 15 & 14 are left unconnected. Applications vary. Your system may have a phantom drive return
detection circuit needing pins 15 & 14 to be connected separately or together, can be taken to ground
via an inductor.
CST7076b Rev.B 4/1/98
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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