EPT7068G [PCA]
Token Ring Front End Filter Module; 令牌环前端滤波器模块
| 型号： | EPT7068G |
| 厂家： | 
PCA ELECTRONICS INC. |
| 描述： | Token Ring Front End Filter Module |
| 文件： | 总2页 (文件大小：40K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Token Ring Front End Filter Module
EPT7068G
E L E C T R O N I C S I N C .
• Optimized for 150Ω Voltage Source Drivers •
• Enhanced Common Mode Rejection Capability •
• Low Profile, Single Channel Module •
• 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.)
32
Media Side
1-16
MHz (Max.)
36
1-6
MHz
6-17
MHz
17-25
MHz
1-30
MHz
30-100
MHz
100-200
MHz
200-300
MHz
44
MHz (Min.)
150
MHz (Min.)
MHz (Min.)
Cable Side
150/100
-.8
-7
-18
-30
-18
-12
-8
-40
-20
-15
-10
Schematic
14
A1-150
7
12
13
XMT+ 2
150 Ω
XMT- 3
A3-COM
A2-100
Filter
10
B2-100
11
B3-COM
8
GND A
GND
4
6
9
B1-150
Pins 1 & 5 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
EPT7068G
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
CST7068Ga 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.
Token Ring Front End Filter Module
EPT7068G
E L E C T R O N I C S I N C .
The circuit below is a guideline for interconnecting PCA’s EPT7068G 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. If you are using 120Ω 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 EPT7069 or similar parts
optimized for 120Ω cable.
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 EPT7068G. 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
14
RSTP
6(G)
DB-9
1(R)
Rcv-
12
Rcv Channel
11
9
6
Connector
EPT7068G
Chassis
Ground
+5V
4
9(O)
5(B)
TSTP
+5V
Use only
one connector
50Ω/2W
PHOUTA
PHOUTB
12
50Ω/2W
4
9
RU
10µF
11
10µF
5
3
6
14
13
RJ45
TI380C30
Xmit Channel
TU
1
10
6
C*
2
8
7
Xmit+
Xmit-
2
3
100Ω
100Ω
EPT7068G
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 is not shown.
3. Your application may suffice by using an external inductor pulled to ground.
4. Red line connections to DB-9 Connector are 75Ω impedance traces (if used).
5. C* : Primary center taps may be pulled to ground by Caps to enhance common mode attenuation.
CST7068Gb 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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