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| Token Ring Front End Filter Module ELECTRONICS INC. EPT7068G * Optimized for 150 Voltage Source Drivers * * Enhanced Common Mode Rejection Capability * * Low Profile, Single Channel Module * * Complies with or exceeds IEEE 802.5 Requirements * Electrical Parameters @ 25 C Impedance [Xmit/Rcv] Media Side 150 Cable Side 150/100 Insertion Loss (dB) 32 1-16 36 44 MHz (Max.) MHz (Min.) MHz (Min.) MHz (Min.) -.8 -7 -18 -30 1-6 MHz -18 Return Loss (dB Min.) 6-17 MHz -12 17-25 MHz -8 1-30 MHz -40 Common Mode Rejection (dB Min.) 30-100 MHz -20 100-200 MHz -15 200-300 MHz -10 Schematic 14 A1-150 7 XMT+ 2 150 XMT- 3 Filter 11 B3-COM 10 B2-100 8 9 B1-150 Pins 1 & 5 are not connected. 12 A3-COM 13 A2-100 GND A 4 GND 6 Package A J Pin 1 I.D. PCA EPT7068G Date Code Dimensions N Dim. A B C D E F G H I J K L M N P Q Min. .780 .510 .090 .595 .003 .097 .660 .017 .008 .090 0 .025 (Inches) Max. Nom. .800 .530 .100 .605 .010 .103 .680 .022 .013 .100 8 .045 .790 .520 .095 .600 .005 .100 .670 .020 .011 .095 4 .040 .030 .100 .085 .700 (millimeters) Min. Max. Nom. 19.81 12.95 2.29 15.11 .076 2.46 16.76 .432 .203 2.29 0 .635 20.32 13.46 2.54 15.37 .254 2.62 17.27 .559 .330 2.54 8 1.14 20.07 13.21 2.41 15.24 .127 2.54 17.02 .508 2.79 2.41 4 1.02 .762 2.54 2.16 17.78 B Q Pad Layout P D E C M K L I H F G PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343 CST7068Ga Rev. 1 7/7/98 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 Token Ring Front End Filter Module ELECTRONICS INC. EPT7068G The circuit below is a guideline for interconnecting PCA's EPT7068G 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 TI380C series. 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 EPT7069 or similar parts optimized for 120 cable. Note that the receiver side filtering is identical, thus making it possible for use in a DTR application as well. 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 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 EPT7068G. 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, balanced and well coupled to achieve minimum radiation from these traces. Typical Application Circuit Connection to TI380C30 (or Equivalent) Rcv+ 100 2 3 12 11 Rcv Channel 13 10 14 9 1(R) RSTP 6(G) DB-9 Connector Chassis Ground 5(B) TSTP 9(O) Use only one connector Rcv- EPT7068G +5V +5V 50/2W 6 4 PHOUTA PHOUTB 12 50/2W 10F 10F 9 14 Xmit Channel 13 10 C* 11 4 RU 5 3 TU 6 1 2 7 8 RJ45 TI380C30 Xmit+ 442 100 2 EPT7068G 6 4 Chassis Ground Xmit100 3 Notes : 1. 2. 3. 4. 5. Suggested phantom circuit is for reference only. Applications Vary. Phantom return on Rcv channel at pins 11 and 12 is not shown. Your application may suffice by using an external inductor pulled to ground. Red line connections to DB-9 Connector are 75 impedance traces (if used). C* : Primary center taps may be pulled to ground by Caps to enhance common mode attenuation. PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343 CST7068Gb Rev. 1 7/7/98 TEL: (818) 892-0761 FAX: (818) 894-5791 http://www.pca.com |
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