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Token Ring Transceiver Module
ELECTRONICS INC.
EPT7055A
* Optimized for voltage source driving into 150 * * Enhanced Common Mode performance over UTP * * Robust construction allows for solder reflow processes * * Complies with or exceeds IEEE 802.5 Requirements *
Electrical Parameters @ 25 C
Impedance () [Rcv] Chip Side 150 Cable Side 100 1-16 MHz Insertion Loss (dB Min.) 32 MHz 36 MHz 44 MHz 1-6 MHz Return Loss (dB Min.) 6-17 MHz 17-24 MHz Common Mode Rejection (dB Min.) 1-30 MHz 30-100 MHz 100-200 MHz Crosstalk (dB Min.) 10 MHz
Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit -.6* -.5* -7 -1 -25 -3 -30 -3 -18 -23 -18
Rcv Xmit -20 -8
Rcv Xmit Rcv Xmit Rcv Xmit Rcv -10 -57 -40 -35 -35 -20 -20 -50
* dB Max.
Schematic
TX1+ 2 150 TX1- 4 CT- 5 RX0+ 6 150 RX0- 8 RXCT 7 1 : .817 .1 F LPF 1 : .817 14 TXO+ 3.01K .1 F
R1
13 TXO9 PHA 12 RX1+ UTP
3.9K
R2
11 RX110 PHB
Package
A B
Pin 1 I.D. Dim. A B C D E F G H I J Min. 1.480 .255 .440 1.300 .010 .100 .130 .020 .010 .127
Dimensions
(Inches) Max. Nom. 1.500 .275 .460 Typ. .015 Typ. .150 .024 Typ. .137 (Millimeters) Min. Max. Nom. 37.60 6.48 11.43 33.02 .254 3.18 3.30 .508 .254 3.23 38.10 6.99 11.68 Typ. .381 Typ. 3.81 .610 Typ. 3.48
C
PCA EPT7055A Date Code
E
H D
F
G
I J
PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343
CST7055Aa
Rev. D 6/2/97
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
Token Ring Transceiver Module
ELECTRONICS INC.
EPT7055A
The circuit below is a guideline for interconnecting PCA's EPT7055A 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. Typical insertion loss of the isolation transformer is 0.5dB up to 16 MHz. Under terminated conditions, to transmit a 2V pkpk signal across the cable, you must adjust the specific chip preset template control resistors to get at least 2.12V pk-pk across the transmit input pins. 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 EPT7055A. There need not be any ground plane beyond this point. For best results, PCB designer should design the outgoing traces preferably to be 50, balanced and well coupled to achieve minimum radiation from these traces.
Typical Application Circuit Connection to TI380C60 (or Equivalent)
RCVINA
150
38
6 8
+5V
12 11 14 13
5 Xmit 4 3 Rcv 6 1 2 7 8
RCVINB
RJ45
37
+5V
50/2W
PHOUTA PHOUTB
29
50/2W
9
10F
27
10F
10
TMS38060
DROUTB DROUTA 32
100
422
31
100
2
EPT7055A
7 5
11
Common Mode
4
Notes : 1. Current limiting resistors R1 & R2 are included in this package.
PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343
CST7055Ab
Rev. D 6/2/97
TEL: (818) 892-0761 FAX: (818) 894-5791 http://www.pca.com

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