EPT7069G [PCA]
120W Token Ring Front End Filter Module; 120W令牌环前端滤波器模块
| 型号： | EPT7069G |
| 厂家： | 
PCA ELECTRONICS INC. |
| 描述： | 120W Token Ring Front End Filter Module |
| 文件： | 总2页 (文件大小：38K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
120Ω Token Ring Front End Filter Module
EPT7069G
E L E C T R O N I C S I N C .
• Recommended for use in both UTP and STP •
• Enhanced Common Mode Rejection Capability •
• Robust construction in low profile allows for severe soldering processes •
• Complies with or exceeds IEEE 802.5 Requirements •
Electrical Parameters @ 25° C
Impedance
[Xmit/Rcv]
Insertion Loss
Return Loss
(dB Min.)
Common Mode Rejection
(dB)
(dB Min.)
Media Side
1-16
32
36
1-6
MHz
6-17
MHz
17-25
MHz
1-30
MHz
30-100
MHz
100-200
MHz
200-300
MHz
44
150
MHz (Max.) MHz (Min.) MHz (Min.)
MHz (Min.)
-.8
-7
-18
-30
-18
-12
-8
-40
-20
-15
-10
Cable Side
120
Schematic
7
12
13
XMT+ 2
150 Ω
XMT- 3
A2-COM
A1-120
Filter
10
B1-120
11
B2-COM
8
GND A
GND
4
6
1.118:1
Pins 1, 5, 9 & 14 are not connected.
Package
Dimensions
A
(Inches)
Dim. Min. Max. Nom.
(millimeters)
Min. Max. Nom.
N
J
A
B
C
D
E
F
G
H
I
.780
.510
.090
.595
.003
.097
.660
.017
.008
.090
0°
.800 .790
.530 .520
.100 .095
.605 .600
.010 .005
.103 .100
.680 .670
.022 .020
.013 .011
.100 .095
19.81 20.32 20.07
12.95 13.46 13.21
Pin 1
I.D.
PCA
Pad
P
2.29
2.54
2.41
EPT7069G
Date Code
Q
B
E
Layout
15.11 15.37 15.24
.076
2.46
.254
2.62
.127
2.54
16.76 17.27 17.02
.432
.203
2.29
0°
.559
.330
2.54
8°
.508
2.79
2.41
4°
1.02
.762
2.54
2.16
17.78
M
D
J
K
L
M
N
P
Q
8°
4°
K
C
.025
.045 .040
.030
.635
1.14
.100
I
L
.085
.700
G
H
F
CST7069Ga Rev. 1 7/7/98
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.
120Ω Token Ring Front End Filter Module
EPT7069G
E L E C T R O N I C S I N C .
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 120Ω 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 75Ω/50Ω, balanced and well coupled to
achieve minimum radiation from these traces.
Typical Application Circuit Connection to TI380C30 (or Equivalent)
Rcv+
2
3
13
10
Rcv-
12
Rcv Channel
11
6
4
EPT7069G
+5V
Chassis
Ground
+5V
50Ω/2W
PHOUTA
PHOUTB
11
50Ω/2W
4
RU
10µF
12
10µF
5
3
6
RJ45
13
10
6
TI380C30
Xmit Channel
TU
1
C*
2
8
7
Xmit+
Xmit-
2
3
100Ω
100Ω
EPT7069G
4
Chassis
Ground
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.
CST7069Gb Rev. 1 7/7/98
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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