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| Token Ring Interface Module ELECTRONICS INC. EPT7088 * Optimized for Texas Instrument's TI38054 * * Supports both UTP Transmission * * Complies with or exceeds IEEE 802.5 Requirements * Electrical Parameters @ 25 C Impedance ( ) Insertion Loss ( dB Max. ) ( dB Min. ) 1-6 MHz -14 Return Loss (dB Min.) 6-17 MHz -12 17-25 MHz -8 100 KHz -65 Common Mode Rejection (dB Min.) 1 5 MHz MHz -45 -30 20 MHz -30 70 100 200 MHz MHz MHz -15 -15 -20 Chip Side 1-4 8 16 24 32 36 44 80 MHz MHz MHz MHz MHz MHz MHz MHz 600 Cable Side 100 -.5 -.8 -1 -1.9 -7 -25 -30 -25 Schematic Ph- 6 Ph+ 11 Tx+ 16 15 2 Tx- 1 Xmit Filter Impedance Matching Network CMF 8 Tu7 3 , 14 Pins 4 , 5 , 12 , 13 are Not Connected 10 9 Tu+ Package A J PCA EPT7088 Date Code Dim. A B C D E F G H I J K Dimensions (Inches) Min. Max. Nom. .990 .442 .351 --.005 --.525 .016 ----.125 1.000 .462 .371 --.025 --.555 .022 ----.150 .995 .452 .361 .700 .015 .100 .540 .020 .010 .147 .138 (Millimeters) Min. Max. Nom. 25.15 11.23 8.92 --.130 --13.34 .406 ----3.18 25.65 11.73 9.42 -.640 --14.10 .559 ----3.81 25.27 11.48 9.17 17.78 .381 2.54 13.72 .508 2.54 3.75 3.50 B White dot pin #1 D C E I H F K G PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343 CST7088 Rev. 1 1/19/99 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. EPT7088 The circuit below is a guideline for interconnecting PCA's EPT7088 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 "current source" driver such as TMS38054. Typical insertion loss of the isolation transformer is 0.5dB up to 16 MHz. The Toek Ring filter design follows the I.E.E.E 802.5 last recommendations in the Standard regarding the differential phase delay and the return loss right up to the filter cut off frequency. This module requires either a receiver module with only isolation transformer/common mode choke combination(such as the EPT7089) or another module identical to the EPT7088 to complete the transceiver operation. 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 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 EPT7088. 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 TMS38054 (or Equivalent) RCVINA 38 100 1 4 CT +5V +5V 50/2W 8 5 7 RCVINB 37 2 EPT7089 6 PH RET A PH RET B Use only one connector 4 5 PHOUTA 29 50/2W 6 10F 10F PHOUTB 27 11 15 5v RJ45 TMS38054 9 8 3 6 1 2 7 8 2 3 14 DROUTB 31 DROUTA 32 300 300 16 1 EPT7088 +5V Notes : Phantom returns are left unconnected. Applications vary. Your system may have a phantom drive return detection circuit needing pins 7 & 6 to be connected separately. Receiver CT can be grounded via a cap. PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343 CST7088 Rev. 1 1/19/99 TEL: (818) 892-0761 FAX: (818) 894-5791 http://www.pca.com |
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