Impedance
(
)
[Xmit/Rcv]
Insertion Loss
(dB)
Common Mode Rejection
(dB Min.)
Return Loss
(dB Min.)
1-16
MHz
1-30
MHz
30-100
MHz
100-200
MHz
Crosstalk
(dB Min.)
1-30
MHz
200-300
MHz
32
MHz
36
MHz
1-6
MHz
6-17
MHz
17-25
MHz
Electrical Parameters @ 25
C
Token Ring Transceiver Module
CST7076a Rev.B 4/1/98
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
Schematic
Package
EPT7076
44
MHz
-12
-18
-8
-50
-38
Xmit
Rcv Xmit
Rcv Xmit
Rcv Xmit Rcv Xmit Rcv Xmit
Rcv
-35
-30
-.8
Xmit Rcv
-.5
-7
Xmit Rcv
-1
-20
-25
Xmit Rcv
-3
-23
-10
-40
-35
-30
100
Cable Side
Xmit
Rcv
-20
-20
-30
Xmit Rcv
-3
E L E C T R O N I C S I N C .
150
Chip Side
1.090
.260
.380
.950
.010
.050
.135
.016
.008
.075
.130
.100
1.110
.280
.400
Typ.
.030
Typ.
Typ.
.022
.012
Typ.
.150
Typ.
27.69
6.60
9.65
24.13
.254
1.27
3.43
.406
.203
1.91
3.30
2.54
28.19
7.11
10.16
Typ.
.762
Typ.
Typ.
.559
.305
Typ.
3.81
Typ.
Dimensions
A
B
C
D
E
F
G
H
I
J
K
L
Dim.
Min.
Max.
Nom.
(Inches)
(Millimeters)
Min.
Max.
Nom.
K
A
E
C
I
PCA
EPT7076
Date Code
G
B
Pin 1 I.D.
J
L
D
H
F
LPF
FIN 1
FINL 2
5 FOUT
4 FOUT
FGND 3
TX1+ 9
TX1- 10
19 TXOUTL
20 TXOUT
TXCT 11
15 RPHB
RX0+ 6
RX0- 7
150
14 RPHA
18 RXIN
17 RXINL
RXCT 8
12 TPHB
13 TPHA
150
100
100
TEL: (818) 892-0761
FAX: (818) 894-5791
http://www.pca.com
PCA ELECTRONICS, INC.
16799 SCHOENBORN ST.
NORTH HILLS, CA 91343
150
150
Max.
Max.
Min.
Max.
Min.
Max.
Min.
Product performance is limited to specified parameters. Data is subject to change without prior notice.
4
CST7076b Rev.B 4/1/98
Token Ring Transceiver Module
Typical Application Circuit Connection to TI380C60 (or Equivalent) For NIC.
E L E C T R O N I C S I N C .
EPT7076
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.
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.
TI380C60
Rcv+
PHOUTA
50
/2W
50
/2W
EPT7076
150
6
7
13
18
17
20
19
100
442
Rcv-
PHOUTB
Xmit-
Xmit+
1
2
+5V
+5V
10
F
10
F
100
12
RJ4
5
4
5
3
6
8
7
1
2
Rcv
Xmit
11
15
14
PH-B
PH-A
5
9
10
3
8
TEL: (818) 892-0761
FAX: (818) 894-5791
http://www.pca.com
PCA ELECTRONICS, INC.
16799 SCHOENBORN ST.
NORTH HILLS, CA 91343
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