EPF8046G Просмотр технического описания (PDF) - PCA ELECTRONICS INC.
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EPF8046G Datasheet PDF : 2 Pages
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ELECTRONICS INC.
100 Base-X Interface Module
EPF8046G
The circuit below is a guideline for interconnecting PCA’s EPF8046G with ML6692 or ML6694 chip applications. Further
details can be obtained from the chip manufacturer application notes.
Typical insertion loss of the isolation transformer is 0.5dB. This parameter covers the entire spectrum of the encoded
signals in 100 BX protocol. Under terminated conditions, to transmit a 2V pk-pk signal across the cable, you must adjust
the chips supporting resistor to get at least 2.12V pk-pk across the transmit pins.
Note that in the 100 BX application, you do not need a split primary. The reason is that there is no 10 Base-T to negotiate.
The receiver side can be terminated as shown or a by single 100 Ω with primary center tap taken to ground via a suitable
cap.
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.
Also, in, some cases , there has been EMI improvement by taking pin 12 to Chassis via a cap. It may not be required: this
can be decided only during an EMC test. Same comments apply to pin 5 connection.
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 EPF8046G. There need not be any ground plane beyond
this plane.
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.
TX+
ML6692 TX-
or
ML6694
RX+
RX-
Typical Application Circuit for UTP
+5V
3
8
7
9
1
10
2
50Ω
14
16 EPF8046G
50Ω
15
5 12
.1 µF
Capacitor
Chassis
Ground
1
Xmit
2
3
Rcv
6
RJ45*
4
5
7
8
Notes : * NIC Side is shown. Hub side connection will swap pins 3-6 with 1-2.
PCA ELECTRONICS, INC.
16799 SCHOENBORN ST.
NORTH HILLS, CA 91343
CSF8046Gb Rev. 3 12/13/96
TEL: (818) 892-0761
FAX: (818) 894-5791
http://www.pca.com
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