Insertion Loss
(dB Max.)
Common Mode Rejection
(dB Min.)
Return Loss
(dB Min.)
1-16
MHz
1-30
MHz
-12
-18
30-100
MHz
-10
100-200
MHz
-40
Crosstalk
(dB Min.)
-35
1-30
MHz
200-300
MHz
32
MHz
36
MHz
1-6
MHz
6-17
MHz
17-25
MHz
Xmit
Rcv
Xmit
Rcv
Xmit
Rcv
Xmit
Rcv
Xmit Rcv
Xmit
Rcv
-35
-10
-1
Xmit
Rcv
-1
-7
Xmit
Rcv
-1
-25
Xmit
Rcv
-1
-18
-10
-40
-30
-10
Electrical Parameters @ 25
C
Token Ring Transceiver Module
CST7008Aa Rev. - 10/2/96
Optimized for Texas Instrument's TMS38054
Supports both UTP and STP Transmission
Overvoltage Protection Circuit
Complies with or exceeds IEEE 802.5 Requirements
Schematic
Dimensions
A
B
C
D
E
F
G
H
I
J
K
L
M
N
P
Q
Dim.
1.290
.575
.300
1.110
.003
.100
.780
.015
.008
.090
0
.025
Min.
1.310
.585
.320
Typ.
.020
Typ.
.800
.021
.012
Typ.
8
.045
Max.
.030
.100
.092
.800
Nom.
(Inches)
(millimeters)
32.77
14.60
7.62
28.19
0.076
2.54
19.81
.381
.203
.228
0
.635
Min.
33.27
14.86
8.13
Typ.
.508
Typ.
20.32
.533
.305
Typ.
8
1.14
Max.
.762
2.54
2.34
20.32
Nom.
Package
EPT7008AG
150/100
Cable Side
Xmit
Rcv
-10
-10
E L E C T R O N I C S I N C .
Tx+ 12
Tx- 10
Gnd 2 9
Ph- 13
Ph+ 14
Vcc 2 11
17 Tu-
16 Ts-
18 Tu+
19 Ch Gnd
Xmit
Filter
15 Ts+
.1
F
Gnd 1 3
Rx+ 2
Rx- 4
PhRet 24
Vcc 1 1
21 Ru+
23 Rs-
22 Rs+
20 Ru-
CMF
Pin 1
I.D.
C
D
E
B
F
L
A
H
N
P
M
Q
G
K
600/150
Chip Side
PCA
EPT7008AG
Date Code
Impedance
Matching
Network
CMF
-15
J
I
TEL: (818) 892-0761
FAX: (818) 894-5791
http://www.pca.com
PCA ELECTRONICS, INC.
16799 SCHOENBORN ST.
NORTH HILLS, CA 91343
Impedance
[Xmit/Rcv]
Product performance is limited to specified parameters. Data is subject to change without prior notice.
CST7008Ab Rev. - 10/2/96
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 .
EPT7008AG
The circuit below is a guideline for interconnecting PCA's EPT7008AG 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 "current source" driver such as TMS38054. Only one type of cable
should be driven by the module: either UTP or STP. If you are using 120
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 EPT7066 or similar parts optimized
for 120
cable.
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 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 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 EPT7008AG. There need not be any ground plane beyond
this point.
For best results, PCB designer should design the outgoing traces preferably to be 75
/50
, (as the case may be)
balanced and well coupled to achieve minimum radiation from these traces.
Notes : 1. Pin 24 is left unconnected. Applications vary. Your system may have a phantom
drive return detection circuit needing pin 24 to be connected separately.
2. Red line connections to DB-9 Connector are 75
impedance traces.
TMS38054
RJ45
4
5
3
6
RCVINA
PHOUTA
Chassis
Ground
50
/2W
50
/2W
EPT7008AG
100
4
2
1
24
13
5(B)
9(O)
DB-9
Connector
21
23
22
20
19
16
15
18
17
300
300
+5V
RCVINB
PHOUTB
DROUTA
DROUTB
14
11
12
10
+5V
+5V
+5V
10
F
10
F
Use only
one connector
1(R)
6(G)
8
7
1
2
38
29
37
27
32
31
Vcc1
PHRET
3
Rcv
Xmit
TEL: (818) 892-0761
FAX: (818) 894-5791
http://www.pca.com
PCA ELECTRONICS, INC.
16799 SCHOENBORN ST.
NORTH HILLS, CA 91343
PDF 
ZIP