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Part: EPT7039GM
Category:
Description: Token Ring Transceiver Module
Company: PCA Electronics Inc.
Datasheet: Download EPT7039GM datasheet File size : 78 kB
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Datasheet text preview:
Token Ring Transceiver Module
ELECTRONICS INC.
EPT7039GM
· Optimized for Texas Instrument's TMS83054 · · Supports both UTP and STP Transmission · · Overvoltage Protection Circuit · · Complies with or exceeds IEEE 802.5 Requirements ·
Electrical Parameters @ 25° C
Impedance [Xmit/Rcv] Chip Side 600/150 1-16 MHz Insertion Loss (dB Max.) 32 MHz 36 MHz 44 MHz 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 MHz 200-300 MHz Rcv -20 -35 Crosstalk (dB Min.) 1-30 MHz
Cable Side Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit 150/100 -1 -1 -7 -1 -25 -1 -35 -1 -18 -18 -12
Rcv Xmit -15 -8
Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit -10 -40 -40 -35 -30 -30 -30 -20
PhPh+ Vcc 2 Tx+
14 13 11 12
Schematic
15 Ts+
Transmit Filter
Tx- 10 Gnd 2 9 Gnd 1 3 Rx+ 2
.1µF
16 Ts-
Common Mode Filter
17 Tu18 Tu+ 19 N/C 23 Rs22 Rs+
.1µF
Vcc 1 1
Rx- 4 PhRet B 5 PhRet A 6
Common Mode Filter
21 Ru+ 20 Ru-
Package
A N Dim. Pin 1 I.D. PCA EPT7039GM Date Code B Q Pad Layout P A B C D E F G H I J K L M N P Q Min. 1.290 .575 .300 1.110 .003 .100 .780 .015 .008 .090 0° .025
Dimensions
(Inches) Max. Nom. 1.310 .585 .320 Typ. .020 Typ. .800 .021 .012 Typ. 8° .045 .030 .100 .092 .800 (Millimeters) Min. Max. Nom. 32.77 14.60 7.62 28.19 0.076 2.54 19.81 .381 .203 2.28 0° .635 33.27 14.86 8.13 Typ. .508 Typ. 20.32 .533 .305 Typ. 8° 1.14 .762 2.54 2.34 20.32
D E
M
C J H F
K
L G I
PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343
CST7039GMa Rev.
10/17/96
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
Token Ring Transceiver Module
ELECTRONICS INC.
EPT7039GM
The circuit below is a guideline for interconnecting PCA's EPT7039GM 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 "current source" driver such as TMS38054. Only one type of cable should be driven by the module: either UTP or STP. If you are using 120 cable or desire to install only one RJ45 connector thus leaving the STP use with a dongle when needed, please refer to PCA part numbers EPT7066 or similar parts optimized for 120 cable. 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 chip 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 pins of EPT7039GM. There need not be any ground plane beyond this point. For best results, PCB designer should design the outgoing traces preferably to be 75/50, (as the case may be) balanced and well coupled to achieve minimum radiation from these traces.
Typical Application Circuit Connection to TMS38054 (or Equivalent). For NIC.
RCVINA
100
4 2 Vcc1
+5V
23 22 N/C
RCVINB
+5V
1(R) 6(G) DB-9 Connector 5(B) 9(O) Use only one connector 4 Rcv ± 5 3 X m i t± 6 1 2 7 8
1 6 5
PHA PHB
PHOUTA PHOUTB
19
5 0 13 2W 10µF 10µF 5 0 14 2W
16 15 21
TMS38054
+5V
11 3
20
RJ45
DROUTB DROUTA
300 300
12 10
EPT7039GM
18 17
+5V
Notes : 1. Pins 5 & 6 are left unconnected. Applications vary. Your system may have a phantom drive return detection circuit needing pins 5 & 6 to be connected separately. 2. Red line connections to DB-9 Connector are 75 impedance traces.
PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343
CST7039GMb Rev.
10/17/96
TEL: (818) 892-0761 FAX: (818) 894-5791 http://www.pca.com
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