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Miniature Token Ring Transceiver Module
ELECTRONICS INC.
EPT7061GM
* Ideal for DTR Application with PHY Chip E.G. TI380C60 * * Optimized for 120 * * Recommended for UTP or STP Transmission * * Complies with or exceeds IEEE 802.5 Requirements *
Electrical Parameters @ 25 C
Impedance [Xmit/Rcv] Chip Side 1-16 MHz Max. 150 Insertion Loss (dB) 32 MHz Min. 36 MHz Min. 44 MHz Min. 1-6 MHz Return Loss (dB Min.) 6-17 MHz 17-25 MHz 1-30 MHz Common Mode Rejection (dB Min.) 30-100 MHz 100-200 MHz 200-300 MHz Crosstalk (dB Min.) 1-16 MHz
Cable Side Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv 120 -.8 -.8 -7 -7 -25 -25 -25 -25 -16 -16 -16 -16 -9 -9 -55 -55 -50 -50 -40 -40 -30 -30 -45
Schematic
5 1 3 150 2 Chip Side 15 9 13 150 16 12 14 Rcv Filter 120 10 Cable Side 4 7 Xmit Filter 120 8
Package
A J
Pin 1 I.D. PCA EPT7061GM Date Code Dim. Min. .980 .365 .340 .700 .010 .100 .500 .018 .008 .145 0 .025
Dimensions
(Inches) Max. Nom. 1.00 .385 .360 Typ. .030 Typ. .520 .022 .012 Typ. 8 .045 .040 .100 .055 .540 (Millimeters) Min. Max. Nom. 24.89 9.27 8.64 17.78 .254 2.54 12.70 .457 .203 3.68 0 .635 25.40 9.78 9.14 Typ. .762 Typ. 13.21 .559 .305 Typ. 8 1.14 1.02 2.54 1.40 13.72
N
B
Q
Pad Layout
P
D
M
C
E
K L I
A B C D E F G H I J K L M N P Q
H
F
G
PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343
CST7061GMa Rev. 2 2/27/98
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
Miniature Token Ring Transceiver Module
ELECTRONICS INC.
EPT7061GM
The circuit below is a guideline for interconnecting PCA's EPT7061GM with a typical Token Ring PHY chip for 4 Mb/16Mb applications over STP or 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. Only one type of cable should be driven by the module: either UTP or STP. Note that the two channels have identical filtering and other magnetics . This option is seen to be widely used by system designers when designing dedicated Token Ring systems. 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 pins of EPT7061GM. There need not be any ground plane beyond this point. For best results, PCB designer should design the outgoing traces preferably to be 50 (UTP), balanced and well coupled to achieve minimum radiation from these traces.
Typical Application Circuit Connection to TI380C60 (or Equivalent). Only NIC side shown.
Rcv150
2 1 PH-B
+5V
7 8 9 10
4 5 3 6
Rcv
Rcv+
+5V
RJ45
Xmit 1 2 7 8
3 4
PH-A
50/2W
PHOUTA PHOUTB
14
50/2W 10F 10F
13
DTR PHY
Xmit+ Xmit100
442
100
15
EPT7061GM
16
Notes : 1. Pins 3 & 4 are left unconnected. Applications vary. Your system may have a phantom drive return detection circuit needing pins 3 & 4 to be connected separately.
PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343
CST7061GMb Rev. 2 2/27/98
TEL: (818) 892-0761 FAX: (818) 894-5791 http://www.pca.com

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