insertion loss (db max.) common mode rejection (db min.) return loss (db min.) 1-16 mhz 1-30 mhz -15 -15 30-100 mhz -10 100 mhz -70 crosstalk (db min.) -35 1-30 mhz 200-300 mhz 32 mhz 36 mhz 1-6 mhz 6-17 mhz 17-25 mhz xmit rcv xmit rcv xmit rcv xmit rcv xmit rcv xmit rcv -35 -45 -.8 xmit rcv -.8 -7 xmit rcv -1 -20 -25 xmit rcv -1 -20 - 15 -70 -30 -45 electrical parameters @ 25 c token ring transceiver module cst7045gma rev. - 10/5/96 ? optimized for texas instruments tms38054 ? ? supports both utp and stp transmission ? ? overvoltage protection circuit ? ? complies with or exceeds ieee 802.5 requirements ? schematic dimensions a b c d e f g h i j k l m n p q dim. 1.290 .575 .300 1.110 .003 .100 .780 .015 .008 .090 0 .025 min. 1.310 .585 .320 typ. .020 typ. .800 .021 .012 typ. 8 .045 max. .030 .100 .092 .800 nom. (inches) (millimeters) 32.77 14.60 7.62 28.19 0.076 2.54 19.81 .381 .203 2.28 0 .635 min. 33.27 14.86 8.13 typ. .508 typ. 20.32 .533 .305 typ. 8 1.14 max. .762 2.54 2.34 20.32 nom. package EPT7045GM 150/100 cable side xmit rcv -20 -20 44 mhz -35 xmit rcv -1 e l e c t r o n i c s i n c . tx+ 12 tx- 10 gnd 2 9 ph- 13 ph+ 14 vcc 2 11 17 tu- 16 ts- 18 tu+ 19 ch gnd xmit filter 15 ts+ .1f gnd 1 3 rx+ 2 rx- 4 phret b 5 vcc 1 1 21 ru+ 23 rs- 22 rs+ 20 ru- phret a 6 cmf .1f 600/150 chip side impedance matching network cmf pin 1 i.d. c d e b f l a h p n m q g pca EPT7045GM date code pad layout j k i tel: (818) 892-0761 fax: (818) 894-5791 http://www.pca.com pca electronics, inc. 16799 schoenborn st. north hills, ca 91343 impedance [xmit/rcv] product performance is limited to specified parameters. data is subject to chan g e without prior notice.
cst7045gmb rev. - 10/5/96 token ring transceiver module typical application circuit connection to tms38054 (or equivalent). only nic side shown. e l e c t r o n i c s i n c . EPT7045GM the circuit below is a guideline for interconnecting pcas EPT7045GM 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 number 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 ri ng 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 EPT7045GM. 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 ? (stp/utp), balanced and well coupled to achieve minimum radiation from these traces. 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. tms38054 rj45 4 5 3 6 rcvina phouta chassis ground 50 ? /2w 50 ? /2w EPT7045GM 100 ? 2 4 6 5 13 5(b) 9(o) db-9 connector 21 23 22 20 16 19 15 18 17 300 ? 300 ? +5v rcvinb phoutb drouta droutb 14 11 12 10 +5v +5v +5v 10f 10f use only one connector 1(r) 6(g) 8 7 12 rcv xmit pha phb 3 tel: (818) 892-0761 fax: (818) 894-5791 http://www.pca.com pca electronics, inc. 16799 schoenborn st. north hills, ca 91343
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