? semiconductor components industries, llc, 2006 october, 2006 ? rev. 0 1 publication order number: NB3N502DEVB/d NB3N502DEVB nb3n502 evaluation board user?s manual description the nb3n502 evaluation board was designed to provide a flexible and convenient platform to quickly evaluate, characterize and verify the performance and operation of the nb3n502 pll clock multiplier. this user?s manual provides detailed information on the board?s contents, layout and use, and it should be used in conjunction with the nb3n502 data sheet which contains full technical details on device specifications and operation (www.onsemi.com). board features ? fully assembled evaluation board ? accommodates the electrical characterization of the nb3n502 in the soic ? 8 package ? supports the use of a 5 mhz to 27 mhz through ? hole or surface mount crystal ? sma connectors are provided for auxiliary input and output interfaces ? incorporates onboard slide switch controlled multiplier select pins, minimizing excess cabling this evaluation board manual contains ? information on the nb3n502 evaluation board ? appropriate lab setup ? evaluation board layout ? bill of materials figure 1. nb3n502 evaluation board http://onsemi.com
NB3N502DEVB http://onsemi.com 2 setup for measurements basic equipment ? signal generator (for external reference clock input) ? oscilloscope ? power supply ? voltmeter ? high ? speed cables with sma connectors ? high ? impedance probe power supply connections external power supply of +3 v to +5.5 v must be provided to the board. the nb4n502 has a positive supply pin, v dd , and a ground pin, gnd. connect a single power supply to the evaluation board (see figure 2.) by connecting v dd to the positive supply, +3 v to +5.5 v, and gnd to 0 v. power supply banana plug connectors for v dd and gnd are provided at the top corners of the board. table 1. power supply connections supply value connector v dd +3 to +5.5 v red banana plug gnd 0 v black banana plug figure 2. power supply connections +3.0 v to +5.5 v power supplies v dd gnd + ? external reference clock an sma connector is provided for x1/clk if an external clock source is used on pin 1. the metal trace at the package pin is intentionally open for crystal use and must be shorted for a connection to pin 1 for external clock use. crystal and crystal load capacitors selection guide a through ? hole or surface mount crystal can be used. the metal traces at the crystal pins are intentionally open for crystal use and will have no impedance effect on the crystal pins. the total on ? chip capacitance is approximately 12 pf per pin (cin1 and cin2). a parallel resonant, fundamental mode crystal should be used. the evaluation board includes pads for small capacitors from x1/clk to ground and from x2 to ground. these capacitors, cl1 and cl2, are used to adjust the stray capacitance of the board to match the nominally required crystal load capacitance (cload (crystal)). crystal load capacitors must be connected from each of the pins x1 and x2 to ground. the load capacitance of the crystal (cload (crystal)) must be matched by total load capacitance of the oscillator circuitry network, cinx, csx and clx, as seen by the crystal (see figure 3 and equations below). cload1 = cin1 + cs1 + cl1 [total capacitance on x1/clk] cload2 = cin2 + cs2 + cl2 [total capacitance on x2] cin1 cin2 12 pf (typ) [internal capacitance] cs1 cs2 5 pf (typ) [external pcb stray capacitance] cload1,2 = 2 ? cload (crystal) cl2 = cload2 ? cin2 ? cs2 [external load capacitance on x2] cl1 = cload1 ? cin1 ? cs1 [external load capacitance on x1/clk] figure 3. using a crystal as reference clock c s1 c s2 c l1 c l2 crystal c in2 12pf c in1 12pf g r internal to device x1/clk x2 control and select pins the nb4n502 evaluation board is equipped with sma connectors to control the static input logic levels of the multiplier select pins, s0 and s1 (see table 2). pin s1 defaults to m when left open. pin s0 defaults to h when left open. 3 ? position slide switches are also provided to control the multiplier select pins. to use the switches, headers jmp3 and jmp4 must be shorted.
NB3N502DEVB http://onsemi.com 3 1. using the sma connectors a. sma connectors j3 and j4 (dut.6 and dut.7) should be pulled to v cc for logic level high, pulled to gnd for logic level low, and left open for logic level m. 2. using the slide switches a. header pins jmp3 and jmp4 enable the slide switches for the clock multiplier select lines, s0 and s1, and should be jumpered. b. switches sw3 (dut.6) and sw4 (dut.7) are used to select the clock multiplier value (see table 2). c. the h position of the slide switch asserts a logic high on the assigned pin, the l asserts a logic low and the m is an open where the pin ?floats? to a mid ? logic level by way of the device?s internal pullup and pulldown resistors. table 2. clock multiplier select table s1* sw4 (dut.7) s0** sw3 (dut.6) multiplier l l 2x l h 5x m l 3x m h 3.33x h l 4x h h 2.5x l = gnd, h = v dd , m = open (unconnected) *pin s1 defaults to m when left open ** pin s0 defaults to h when left open table 3. header pin conditions header slide switch multiplier control sma multiplier control jmp1 open open jmp2 open open jmp3 jumper (short pins) open jmp4 jumper (short pins) open output connections connect the cmos/ttl outputs, ref and clkout, to the oscilloscope. table 4. output connectors outputs board connector ref j1 (dut.4) clkout j2 (dut.5) figure 4. nb3n502 logic diagram crystal oscillator vco phase detector charge pump ttl/ cmos output ttl/ cmos output reference clock p m multiplier select v dd gnd x1/clk x2 ref clkout s1 s0 feedback
NB3N502DEVB http://onsemi.com 4 signal generator open traces (intentional) for crystal use sma/dut gnd v dd v dd for logic h gnd for logic l v dd for logic h open for logic m gnd for logic l if using the slide switches instead of provided sma connectors, short jmp3 and jmp4 (see table 3). real time oscilloscope high ? z probe out 2 mhz to 50 mhz 50 optional clkout figure 5. typical setup s1 x2 s0 dut.1 dut.4 clk ref x1/clk dut.8 dut.7 dut.6 dut.5 table 5. parts list ref. number qty description manufacturer (notes 1 and 2) r1 1 not populated r2 1 not populated r3 1 not populated c1 1 not populated c2 1 not populated c9 1 22 f 10%, size ?c? tantalum capacitor, t494c226k016at kemet c10 1 0.01 f 10%, (0603), ceramic capacitors, 06035c103kat2a avx c11 1 0.1 f 10%, (0603), ceramic capacitors, 06035c104kat2a avx y1 1 25 mhz crystal u1 1 nb3n502, 8 pin soic (pb?free) on semiconductor sw1 ? sw4 4 slide switches, 3 position miniature, os103011ms8qp1 c&k j1 ? j6 6 sma edge mount connectors, 142 ? 0711 ? 821 johnson jmp1?jmp4 4 jumper header, 100 mil, 2 pins, 1 row, spc20485 spc v dd plug 1 banana plug, red, 571 ? 0500 deltron gnd plug 1 banana plug, black, 571 ? 0100 deltron 1. specified parts are rohs compliant. 2. only rohs compliant parts may be substituted.
NB3N502DEVB http://onsemi.com 5 board layout the evaluation board is constructed with getek material with 50 trace impedances and is designed to minimize noise, achieve high bandwidth and minimize crosstalk. layer stack l1 signal l2 ground l3 v dd l4 signal figure 6. nb3n502 evaluation board top (component) layer s1 x2 s0 clk ref x1/clk dut.1 dut.4 dut.8 dut.7 dut.6 dut.5 figure 7. nb3n502 evaluation board sma ? ground layer s1 x2 s0 clk ref x1/clk dut.1 dut.4 dut.8 dut.7 dut.6 dut.5
NB3N502DEVB http://onsemi.com 6 figure 8. nb3n502 evaluation board power layer s1 x2 s0 clk ref x1/clk dut.1 dut.4 dut.8 dut.7 dut.6 dut.5 figure 9. nb3n502 evaluation board bottom layer
NB3N502DEVB http://onsemi.com 7 figure 10. nb3n502 evaluation board top assembly figure 11. nb3n502 evaluation board bottom assembly on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for an y particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different application s and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its of ficers, employees, subsidiaries, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. publication ordering information n. american technical support : 800 ? 282 ? 9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81 ? 3 ? 5773 ? 3850 NB3N502DEVB/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 303 ? 675 ? 2175 or 800 ? 344 ? 3860 toll free usa/canada fax : 303 ? 675 ? 2176 or 800 ? 344 ? 3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative
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