10/100 LAN Module For DP83840A with
Enhanced Common Mode Attenuation
ELECTRONICS INC.
EPF8013GM
• Optimized for DP83840A/DP83223 Chip Set •
• Guaranteed to operate with 8 mA DC bias at 70°C •
• Complies with or exceeds IEEE 802.3, 10 BT/100 BX Standards •
Electrical Parameters @ 25° C
Insertion Loss
(dB Max.)
OCL
@ 70°C
1-80
MHz
100 KHz, 0.1 Vrms
8 mA DC Bias
Cable Side
80-100
MHz
Return Loss
(dB Min.)
100-150
MHz
1-30
MHz
30-60
MHz
Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit
350µH
-1
-1
•
-1
-1
-3.5
-3
-18
-12
1-30
MHz
30-100
MHz
7
Crosstalk (dB Min.)
[Between Channels]
100-200
MHz
Rcv Xmit
Rcv Xmit Rcv Xmit Rcv Xmit Rcv
-12
-10
-10
-40
Schematic
Receive Channel
100 BX
-40
-35
-30
-30
-30
10 BT
10-100
MHz
-35
-35
Transmit Channel
11
14
Isolation
Transformer
CMT*
12
10
13
6
5-10
MHz
•
15
16
5
2
60-100
MHz
Impedance : 100 Ω • Rise Time : 3.0 nS Max. • * CMT : Optional
Isolation : 1500 Vrms •
1
-18
Common Mode Rejection
(dB Min.)
1:1
3
Dimensions
Package
A
J
N
PCA
EPF8013GM
Date Code
Pin 1 I.D.
B
Pad
Layout
Q
D
M
E
C
K
L
H
PCA ELECTRONICS, INC.
16799 SCHOENBORN ST.
NORTH HILLS, CA 91343
P
F
Dim.
Min.
A
B
C
D
E
F
G
H
I
J
K
L
M
N
P
Q
.970
.380
.223
.700
.003
.100
.500
.016
.008
.090
0°
.025
(Inches)
Max. Nom.
.990
.400
.243
Typ.
.020
Typ.
.520
.022
.012
Typ.
8°
.045
(Millimeters)
Min. Max. Nom.
24.64
9.65
5.66
17.78
0.076
2.54
12.7
.406
.203
2.28
0°
.635
.030
.100
.092
.560
25.15
10.16
6.17
Typ.
.508
Typ.
13.20
.559
.305
Typ.
8°
1.14
.762
2.54
2.34
14.22
I
G
CSF8013GMa Rev. Orig.
11/20/96
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
10/100 LAN Module For DP83840A with
Enhanced Common Mode Attenuation
ELECTRONICS INC.
The circuit below is a guideline for interconnecting PCA’s EPF8013GM with National DP83840A and DP83223 twister chip
set for 10/100 Mb/s applications. Further details can be obtained from the chip manufacturer application notes. This
interface module offers the user two independent inputs : 1. The first pair (13/14) is for 10 Base-T transmit. 2. The second
pair is for the 100 BX transmit.
Typical insertion loss of the isolation transformer is 0.5dB. This parameter covers the entire spectrum of the encoded
signals in 10/100 protocols. Under terminated conditions, to transmit a 2V pk-pk signal across the cable, you must adjust
the TXREF resistor of the twister chip to get at least 2.12V pk-pk across pins 16-15.
Note that significant low frequency response improvement can be obtained in the system (improving equalization effects) if
the DC blocking capacitors were not used; this can only be done by choosing a different pinout for the 10 Base-T receiver
side. This is accomplished without impacting any other behavior. If any user has a need to improve this feature, please
consult with the PCA Technical support group. Parts similar to EPF8013GM are available from several LAN magnetics
vendors.
It is recommended that system designers do not use the receiver side center tap to ground, via a capacitor. This may
worsen EMI, specifically if the secondary “common mode termination” is pulled to chassis ground as shown.
The phantom resistors shown around the 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.
The “common mode termination” load of 75 Ω shown from the center taps of the secondary may be taken to chassis ground
via a cap of suitable value. This depends upon user’s design, EMI margin etc.
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 EPF8013GM. There need not be any ground plane beyond
this point.
For best results, PCB designer should design the outgoing traces preferably to be 50 Ω, balanced and well coupled to
achieve minimum radiation from these traces.
Typical Application Circuit for UTP (Excerpts from NSC DP83840A application notes)
0.10µF {Note 1}
+
1
-
50
75
2
0.1µF
{Note 1}
1000pF
8
7
RXD
5
6
12.1Ω
TXU
50
14
+
4
10
12.1Ω
13
16
1000pF
75
RJ45*
3
12
2
11
2000V
15
-
+
PMRD
-
EPF8013GM
1
Isolation Cap
12.1
TXO
12.1
+
TD
7
6
5
RXI
Chassis
Ground
DP83223
DP83840A
SD
PMID
+
SD
+
RD
-
PCA ELECTRONICS, INC.
16799 SCHOENBORN ST.
NORTH HILLS, CA 91343
Other pull down/up resistors not shown, for clarification please refer to National’s application notes.
Notes : 1. See text above for clarification.
2. *NIC Side is shown. Hub side connections will have crossover swapping pins 3-6 & 1-2.
CSF8013GMb
Rev. Orig.
11/20/96
TEL: (818) 892-0761
FAX: (818) 894-5791
http://www.pca.com