______________________ ____________________ maxim integrated products 1 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxims website at www.maxim-ic.com. evaluates: max3815 max3815 evaluation kit for dvi cables ________________ general description the max3815 evaluation kit (ev kit) is an assembled demonstration board that provides in-system evaluation of the max3815 tmds ? cable equalizer. the input and output connections are made through molex dvi? connectors for direct con nection to dvi cables. single-link and dual-link dvi cables can be connected but only the single-link data path is equalized and passed to the output connector. in this version of the ev kit, the ddc signals are simply passed through the board. also passed through are hot- plug detect, +5v, r, g, b, hsync, vsync, and ddc ground. a battery holder is included along with dc-dc conversion circuitry to allow operation from two aa batteries. no te : the battery pack is for ease of use without an external power supply. operational time will be limited when using batteries. tmds is a registered trademark of silicon image, inc. dvi is a trademark of digital display working group. ____________________________features extends tmds interface length as follows: 0 to 50m over dvi-cable, 24 awg stp (shielded twisted pair) 0 to 36m over dvi-cable, 28 awg stp 0 to 30m over dvi-cable, 30 awg stp fully assembled and tested +3.3v power-supply operation includes aa battery supply option includes on-board +15kv esd protection* pass-through of analog video _______________ordering information part temp range MAX3815EVKIT-DVI 0c to +70c _____________________________________________________________________ component list designation qty description b1 1 keystone aa battery holder c1, c9 2 100 f 10% tantalum capacitors (c case) avx tpsc107k010r0100 c2Cc5, c8, c10, c11, c12 8 0.1 f 10% ceramic capacitors (0402) c7 1 1 f 10% ceramic capacitor (0402) c15, c16 2 10 f 5% ceramic capacitors (0805) d1 1 led, red j1, j2 2 dvi connectors, molex 74320-1000 j3, j4 2 test points ju1, ju3, ju4 3 3-pin headers, 0.1in centers l1 1 22 h inductor tdk slf6028t-220mr77 l2 1 ferrite bead tdk mmz1608s601 (0603) q1 1 pnp transistor (sot23) zetex fmmt591a r2Cr5, r19, r21, r23, r24 0 not installed, resistors r6 1 4.7k 5% resistor (0402) r7 1 200 5% resistor (0402) r8, r16, r17, r18 4 10k 5% resistors (0402) designation qty description r11 1 1k variable resistor r12 1 1k 5% resistor (0402) r13 1 300k 5% resistor (0402) r14 1 180k 5% resistor (0402) r15 1 1m 5% resistor (0402) sw2 2 0 resistors (0603) soldered across bottom two vias of each lane sw4 1 spdt switch u1, u2, u3 3 max3208eaub 15kv esd protection ics u4 1 max3815ccm u5 1 max1796eua u6 0 not installed 1 max3815dvi board, rev a 3 shunts ______________ component suppliers supplier phone fax avx 803-946-0690 803-626-3123 zetex 516-543-7100 516-864-7630 no t e : indicate that you are using the max3815 when contacting these component suppliers. *human body model. 19-3736; rev 0; 1/06 downloaded from: http:///
max3815 evaluation kit for dvi cables 2 _________________________________________________________________________________________ evaluates: max381 5 _______________________________ quick start for evaluation of the max38 15, configure the evaluation kit as follows: 1) if power is supplied to the max3815 through the battery pack, place two aa batteries in the battery holder and place a shunt on the bottom two pins of ju1. 2) if power is supplied by an external source, set the power supplys current limit to 300ma and connect +3.3v at j3 and ground at j4. then place a shunt on the top two pins of ju1. 3) if no cable is attached at j2 (input from cable), the red led at d1 should be illuminated (clk loss). this indicates that no clock signal is being detected by the max3815. if the le d does not illuminate and no cable is attached at j2, check to make sure the batteries are getting proper contact. alternatively, if external power is used, ensure that it is supplying +3.3v. 4) set the equalizer to automatic equalization by switching sw4 to auto. 5) connect a dvi source to j2 (input from cable) and a dvi monitor or dvi receiver at j1 (output). 6) once the dvi source has begun transmitting, the red led (clk loss) will no longer be illuminated. this indicates that the dvi source has begun transmitting video. if manual control of the equaliz er is desired, switch sw4 to manual. to increase t he amount of equalization (long cables), turn r12 clockwise. to decrease the amount of equalization (shor t cables), turn r12 counter- clockwise. note that during manual equalization, all three data channels will be set to the same level of equalization. _________________________ esd protection the max3208 provides 15kv of esd protection for the dvi interface. it is designed to provide protection to the differential lines while maintaining a low capacitance for minimal effects on signal transmission. three max3208 devices are included on the reference design board on the cable side of the max3815. table 1. adjustment and control descriptions (see quick start) component name function d1 clk loss this led turns on when the max3815 does not detect clock signal. j3 +3.3v external power-supply positive connection. j4 gnd external power-supply ground connection. ju1 power placing a shunt across the top two pins connects the max3815 to the supply connectors j3 and j4 so an external power supply can be used. place a shunt across the bottom two pins to supply the max3815 from the battery pack (requires two aa batteries). ju3 drvr_en for future functionality. ju4 cpl_en for future functionality. r12 manual eq set when manual control of the equalizer has been selected using sw4, the level of equalization can be controlled using r12. turning the potentiometer clockwise increases the amount of equalization applied to the input signal. the voltage at eq control can be measured at tp3. sb1 squelch short sb1 with solder to squelch the outputs when no clock signal is detected . sb2 outlevel short sb2 with solder to set the outputs to transmit one-half normal amplitude signals (500mv p-p differential). sb3 max3816 vdd for future functionality. sb4 ddc ground return to connect the display-side ddc return ground to the cable-side ddc return ground, short the left two pads of sb4. to connect the display-side ddc return ground to the ev kit ground short the right two pads of sb4. sw2 max3816 for future functionality. this switch is replaced by two 0 resistors that set the ddc clock and data signals to pass directly through the board. sw4 eq control slide the switch to the le ft to manually control the level of equaliz ation of the max3815. slide it to the right to have the max3815 automatically control the level of equalization. downloaded from: http:///
max3815 evaluation kit for dvi cables ____________________ __________________ __________________ 3 evaluates: max381 5 figure 1. max3815 ev kit schematic downloaded from: http:///
max3815 evaluation kit for dvi cables 4 _________________________________________________________ evaluates: max381 5 figure 2. max3815 ev kit pc component placement guidecomponent side figure 3. max3815 ev kit pc board layouttop side ____________ high frequency layout the following is a list of recommendations to maintain good signal integr ity with the max3815. ? use controlled impedance transmission lines for the clock and data channels. make them differen- tially coupled 100 impedance. ? use an uninterrupted ground plane below the clock and data transmission lines. ? do not use vias on the clock and data trans- mission lines on the input side of the max3815. ? keep the data transmission lines as short as possible. ? place power-supply decoupling capacitors close to the max3815 on pins 1, 4 and 5, 8 and 9, and 12 and 13. downloaded from: http:///
max3815 evaluation kit for dvi cables . ___________________________ _____________________________ 5 evaluates: max381 5 figure 4. max3815 ev kit pc board layoutground plane figure 5. max3815 ev kit pc board layoutpower plane downloaded from: http:///
max3815 evaluation kit for dvi cables 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 cir cuitry and specifications without notice at any time. 6 ____________________maxim integr ated products, 120 san gabriel drive, sunnyvale, ca 94 086 408-737-7600 ? 2006 maxim integrated products is a registered trademark of maxim integrated products, inc. evaluates: max381 5 figure 6. max3815 ev kit pc board layoutsolder side figure 7. max3815 ev kit pc component placement guidesolder side downloaded from: http:///
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