insertion loss (db) common mode rejection (db min.) return loss (db min.) 1-16 mhz max. 1-30 mhz -16 -16 30-100 mhz -9 100-200 mhz -55 crosstalk (db min.) -45 1-16 mhz 200-300 mhz 32 mhz min. 36 mhz min. 1-6 mhz 6-17 mhz 17-25 mhz xmit rcv xmit rcv xmit rcv xmit rcv xmit rcv xmit rcv -50 -40 -.8 xmit rcv -.8 -7 xmit rcv -7 -16 -25 xmit rcv -25 -16 -9 -55 -50 -40 electrical parameters @ 25 c miniature token ring transceiver module cst7061gma rev. 3 1/18/99 ? 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 ? schematic ept7061gm 120 cable side xmit rcv -30 -30 44 mhz min. -25 xmit rcv -25 e l e c t r o n i c s i n c . 150 chip side dimensions a b c d e f g h i j k l m n p q dim. .980 .365 .390 --- .010 --- .500 .018 .008 --- 0 .025 --- --- --- --- min. 1.00 .385 .410 --- .020 --- .520 .022 .012 --- 8 .045 --- --- --- --- max. .990 .375 .400 .700 .015 .100 .510 .020 .010 .145 --- .035 .040 .100 .055 .540 nom. (inches) (millimeters) 24.89 9.27 9.91 --- .254 --- 12.70 .457 .203 --- 0 .635 --- --- --- --- min. 25.40 9.78 10.41 --- .508 --- 13.21 .559 .305 --- 8 1.14 --- --- --- --- max. 25.15 9.53 10.16 17.78 .381 2.54 12.95 .508 .254 .368 --- .889 1.02 2.54 1.40 13.72 nom. xmit filter 1 2 4 3 5 chip side 150 ? 7 8 120 ? 12 rcv filter 15 16 14 13 150 ? 9 10 120 ? cable side 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] package g l k p pad layout q m n a b pca ept7061gm date code pin 1 i.d. d j hf e c i product performance is limited to specified parameters. data is subject to change without prior notice.
cst7061gmb rev. 3 1/18/99 miniature token ring transceiver module typical application circuit connection to ti380c60 (or equivalent). only nic side shown. e l e c t r o n i c s i n c . ept7061gm the circuit below is a guideline for interconnecting pcas 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. 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. dtr phy rcv- phouta 50 ? /2w 50 ? /2w ept7061gm 150 ? 2 1 14 7 8 9 10 100 ? 442 ? rcv+ phoutb xmit- xmit+ 13 15 16 +5v +5v 10f 10f rj45 4 5 3 6 8 7 12 xmit 100 ? rcv 3 4 ph-a ph-b 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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