EPE6104

10 Base-T Interface Module
for Multiport Applications
ELECTRONICS INC.
EPE6104
• Optimized for National DP83950B Repeater Chip •
• Robust design allows for the toughest soldering processes •
• Complies with or exceeds IEEE 802.3, 10 Base-T Requirements •
Electrical Parameters @ 25° C
Cut-off
Frequency
(MHz)
Insertion
Loss
(dB Max.)
Return
Loss
(dB Min.)
± 1.0
MHz
1-10
MHz
5-10
MHz
Common Mode
Rejection
(dB Min.)
Attenuation
(dB Min.)
@ 20
MHz
@ 25
MHz
@ 30
MHz
@ 50-70
MHz
@ 50
MHz
@ 100
MHz
Crosstalk
(dB Min.)
@ 200
MHz
@ 1-10
MHz
Xmit
Rcv
Xmit
Rcv
Xmit
Rcv
Xmit
Rcv
Xmit
Rcv
Xmit
Rcv
Xmit
Rcv
Xmit
Rcv
Xmit
Rcv
Xmit
Rcv
Xmit
Rcv
17
17
-1
-1
-15
-15
-7
-5
-18
-11
-37
-15
-40
-35
-50
-50
-50
-50
-25
-25
-45
-45
•
Isolation : meets or exceeds 802.3 IEEE Requirements • Characteristic Filter Impedance : 100 Ω •
• Referenced @ 5 MHz • All Resistors are matched within ± 1% •
Schematic
332Ω
1
Transmit Channel
56Ω
2
Receive Channel
16
9
8
LPF
100Ω
3
100Ω
11
6
1:1
56Ω
LPF
100Ω
4
1:1
14
332Ω
7
7
Chip Side
UTP Side
Chip Side
UTP Side
Package
Dimensions
A
B
C
Pin 1 I.D.
PCA
EPE6104
Date Code
E
H
J
K
L
F
I
Dim.
Min.
(Inches)
Max.
A
B
C
D
E
F
G
H
I
J
K
L
1.220
.310
.400
1.100
.020
.100
.165
.018
.010°
.065
.120
.200
1.240
.330
.430
Typ.
.023
Typ.
Typ.
.022
Typ.
Typ.
.140
Typ.
(Millimeters)
Min. Max.
9 Plcs
30.99
7.87
10.16
27.94
.508
2.54
4.19
.457
.254
1.65
3.05
5.08
31.50
8.38
10.92
Typ.
.584
Typ.
Typ.
.559
Typ.
Typ.
3.56
Typ.
9 Plcs
G
D
PCA ELECTRONICS, INC.
16799 SCHOENBORN ST.
NORTH HILLS, CA 91343
CSE610a Rev. -
10/24/96
Product performance is limited to specified parameters. Data is subject to change without prior notice.
TEL: (818) 892-0761
FAX: (818) 894-5791
http://www.pca.com
10 Base-T Interface Module
for Multiport Applications
ELECTRONICS INC.
EPE6104
The circuit below is a guideline for interconnecting PCA’s EPE6104 with NSC DP83950B Repeater/10 Base-T PHY chip over
UTP cable. Further details of system design, such as chip pin-out, etc. can be obtained from the specific chip
manufacturer.
Typical insertion loss of the isolation transformer/filter is 0.7dB. This parameter covers the entire spectrum of the encoded
signals in 10 Base-T protocols. However, the predistortion resistor network introduces some loss which has to be taken
into account in determining how well your design meets the Standard Template requirements.
Additionally, note that NSC suggests using a set of resistor networks with lower values suitable for more optimum voltage
level control. Users can obtain modules with either values from PCA (EPE6092). But please check with NSC to find which
set suits most for your specific application. EPE6104 has the lower values. Effective termination impedance offered by the
outputs of the transmit channel is 2*(62//303)//800Ω or approximately 92Ω. Thus, bench testing of return loss needs to
add approx. 7.5Ω on each leg of the transmit inputs to take into account the 74ACTXXXX output impedance.
Note that some systems have auto polarity detection and some do not. If not, be certain to follow the proper polarity.
It is recommended that system designers ground the chip side center taps via a low voltage capacitor. Taking the cable
side center taps to chassis via capacitors, is not recommended, as this will add cost without containing EMI. This may
worsen EMI, specifically if the primary “common mode termination” is pulled to ground as shown.
The pull down resistors used around the RJ45 connector have been known to suppress unwanted radiation that unused
wires pick up from the immediate environment. Their placement and use are to be considered carefully before a design is
finalized.
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 0.08 inches away from the chip side pins of EPE6104. There need not be any ground plane beyond
this point.
For best results, PCB designer should design the outgoing traces preferably to be 50Ω, balanced and well coupled to
achieve minimum radiation from these traces.
Typical Application Circuit (for one port only)
TX+
2
8
3
1
6
6
3
9
1
4
11
2
TXd+
DP83950B
PHY
TXTXdRX+
TX+
TX-
RJ45
RX+
RX4
5
7
8
16
RX14
EPE6104
7
Chassis
Ground
Notes : * Pin-outs shown are for Hub/Repeater Applications only.
PCA ELECTRONICS, INC.
16799 SCHOENBORN ST.
NORTH HILLS, CA 91343
CSE6104b Rev. -
10/24/96
TEL: (818) 892-0761
FAX: (818) 894-5791
http://www.pca.com