quick start 1) remove r12 (differential termination resistor) from the evaluation board. note: be sure to clean flux residue thoroughly. 2) apply +3.3v to the vcc pin (j29). connect power- supply ground to the gnd pin (j30). 3) shunt jumper ju5 (sela). refer to table 1 for other configurations. 4) apply up to 3.125gbps differential data to li2a (j17 and j18). 5) connect soa (j23 and j24) to a high-speed 50 ? oscilloscope. general description the max3783 evaluation kit (ev kit) is an assembled demonstration board that provides easy evaluation of the max3783 multiplexer/buffer. the max3783 ev kit provides 100 ? differential output terminations on- board, simplifying termination of unused outputs. features fully assembled and tested single +3.3v power-supply operation termination of unused outputs provided on- board easy selection of operating modes evaluates: max3783 max3783 evaluation kit ________________________________________________________________ maxim integrated products 1 19-2197; rev 0; 10/01 component list ordering information component suppliers for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. designation qty description c1?40 40 0.1? ?0% ceramic capacitors (0402) murata grm36x5r104k010ad c41 1 33? ?0% tantalum capacitor (c) avx tajc336k010 c42 1 2.2? ?0% tantalum capacitor (c) avx tajc225k035 j1?28 28 sma connectors (edge-mount) j29, j30 2 test points ju1?u6 6 1 2-pin headers (0.1in centers) l1 1 47nh inductor (0805) coilcraft 0805cs-470xkbc r1?6 6 1k ? ?% resistors (0603) r7?13 7 100 ? ?% resistors (0603) u1 1 max3783ucm 48-pin tqfp-ep (exposed pad) none 6 shunts none 1 max3783 evaluation board none 1 max3783 data sheet supplier phone fax avx 803-946-0690 803-626-3123 coilcraft 847-639-6400 847-639-1469 murata 814-237-1431 814-238-0490 part temp. range ic package MAX3783EVKIT 0 c to +85 c 48 tqfp-ep* * exposed pad
detailed description connecting cml outputs to 50 ? oscilloscopes cml outputs have a common-mode voltage near vcc, which is incompatible with oscilloscopes terminated in 50 ? to ground. to avoid interfering with the common- mode voltage, all max3783 cml outputs are ac-cou- pled on-board with 0.1f capacitors. the cml outputs should not be connected directly through 50 ? to ground. terminating unused outputs the max3783 ev kit has 100 ? differential resistors placed across all outputs. these resistors must be removed before connecting the outputs to a 50 ? oscil- loscope. for best performance, keep all outputs termi- nated, either to a 50 ? measurement device or to the 100 ? differential resistor. control lines jumpers ju1 ju6 are provided to set the operating mode of the max3783. shorting these jumpers pulls the corresponding ttl control line to a logical zero. all ttl control lines are internally pulled high through 15k ? resistors. see table 1 to set operating modes. exposed pad (ep) package the exposed pad 48-pin tqfp-ep provides a very low thermal-resistance path for heat removal from the ic. the pad is also electrical ground on the max3783 and must be soldered to the circuit board for proper thermal and electrical performance. evaluates: max3783 max3783 evaluation kit 2 _______________________________________________________________________________________ table 1. operating modes sel_ so_ 0 li2_ 1 li1_ lb_ lo_ 0li_ 1si_
evaluates: max3783 max3783 evaluation kit _______________________________________________________________________________________ 3 figure 1. max3783 ev kit schematic li2a+ li2a- v cc li1a+ li1a- gnd gnd li1b- li1b+ v cc li2b- li2b+ gnd gnd sia- sib- sia+ sia- sia+ v cc v cc vcc vcc sib+ gnd sela v cc soa+ soa- v cc lo1a+ lo1a- v cc lo2a+ lo2a- v cc v cc sob+ selb sob- v cc lo1b+ lo1b- v cc lo2b+ lo2b- v cc gnd 48 47 46 45 44 43 42 41 40 39 38 37 13 12 11 10 9 8 7 6 5 4 3 2 1 25 26 27 28 29 30 31 32 33 34 35 36 14 15 16 17 18 19 20 21 22 23 24 max3783 u1 lb1a lb2a lb1b lb2b lb1a lb2a lb1b lb2b ju1 j1 j2 li2a+ j18 li2a- j17 sela ju5 r1 1k ? c1 0.1 f c2 0.1 f r6 1k ? r2 1k ? r3 1k ? r4 1k ? ju3 ju4 ju2 ju6 j27 j26 selb sib+ sib- j3 j4 c3 0.1 f c4 0.1 f c39 0.1 f c38 0.1 f vcc vcc vcc vcc r7 100 ? j5 sob+ c10 0.1 f sob- j6 c11 0.1 f r9 100 ? j9 lo2b+ c17 0.1 f lo2b- j10 c18 0.1 f r8 100 ? j7 lo1b+ c15 0.1 f lo1b- j8 c16 0.1 f soa+ r12 100 ? r11 100 ? c36 0.1 f c41 33 f c42 2.2 f c35 0.1 f l1 47nh j24 j29 j30 c34 0.1 f c33 0.1 f soa- j23 lo1a- j21 lo1a+ j22 vcc vcc vcc vcc vcc c26 0.1 f li1a- j15 c23 0.1 f c25 0.1 f li1a+ j16 c24 0.1 f li1a+ j16 c24 0.1 f li1b+ j13 c21 0.1 f li1b- j14 c22 0.1 f vcc vcc vcc li2b+ j11 c19 0.1 f c5 0.1 f c6 0.1 f li2b- c20 0.1 f j12 c7 0.1 f c8 0.1 f c9 0.1 f c12 0.1 f vcc c13 0.1 f c14 0.1 f c27 0.1 f c28 0.1 f c29 0.1 f c30 0.1 f j28 j25 c40 0.1 f c37 0.1 f lo2a- r10 100 ? c31 0.1 f c32 0.1 f j19 lo2a+ j20 r13 100 ? r5 1k ?
evaluates: max3783 max3783 evaluation kit 4 _______________________________________________________________________________________ figure 2. max3783 ev kit component placement guide?omponent side 1.0"
evaluates: max3783 max3783 evaluation kit maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 _____________________ 5 ? 2001 maxim integrated products printed usa is a registered trademark of maxim integrated products. figure 3. max3783 ev kit pc board layout?omponent side 1.0" figure 4. max3783 ev kit pc board layout?round plane 1.0" figure 5. max3783 ev kit pc board layout?ower plane 1.0" figure 6. max3783 ev kit pc board layout?older side 1.0"
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