general description the max3674 evaluation kit (ev kit) is a fully assembled and tested demonstration board that simplifies evalua- tion of the max3674 high-performance dual-output net- work clock synthesizer. the ev kit includes a 16mhz crystal and other hardware components necessary to evaluate all the max3674 functions. software is provid- ed that communicates with the ev kit through a usb port. the software provides an easy way to set opera- tional modes and read/write internal registers. the ev kit is powered by a +3.3v supply and usb port. sma connectors are used for the reference clock input and lvpecl clock outputs to simplify connection to test equipment. two leds indicate the status of lock and usb power. features ? fully assembled and tested ? on-board 16mhz crystal reference ? software control through usb port ? sma connectors for clock i/os ? powered by +3.3v supply and usb port ? indicators for lock and usb power evaluates: max3674 max3674 evaluation kit ________________________________________________________________ maxim integrated products 1 19-4156; rev 0; 5/08 component list for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information designation qty description c1, c2 2 33pf 10% ceramic capacitors (0402) c3, c4 0 not installed c5, c18, c20, c21, c22, c24, c26, c28, c29, c31, c33 11 0.1f 10% ceramic capacitors (0603) c6, c34 2 22f 10% ceramic capacitors (1206) c7, c14, c41, c42 4 0.22f 10% ceramic capacitors (0402) c8, c9, c11, c12, c13, c40, c47, c48 8 0.1f 10% ceramic capacitors (0402) c10 1 0.01f 10% ceramic capacitor (0402) c15, c16, c19, c32 4 4.7f 10% ceramic capacitors (0805) c17, c23, c25, c27, c30 5 1f 10% ceramic capacitors (0603) c35 1 0.01f 10% ceramic capacitor (0603) d1, d2 2 leds, green panasonic ln38gpx j1 1 mini usb connector, b type tyco 1734035-1 designation qty description j5 1 2 x 3 pin header (0.1in centers) sullins pec36saan j6, j7 2 test points keystone 5000 j10Cj13 4 sma connectors, edge-mount, tab center johnson 142-0701-851 j17 1 sma connector, pcb mount johnson 142-0701-231 l1 1 22h 20% inductor, 520ma taiyo-yuden cbc3225t220m l2 1 4.7h 20% inductor, 870ma taiyo-yuden cbc3225t4r7m l4Cl7 4 ferrite beads murata blm18hk102sn1 (0603) r1, r21 2 49.9 1% resistors (0603) r2 1 10 1% resistor (0603) r3 1 470 1% resistor (0603) r4, r6Cr11 7 4.75k 1% resistors (0603) r5 1 1.5k 1% resistor (0603) r12, r13, r22, r23 4 10k 1% resistors (0603) r24 1 680 1% resistor (0603) r25Cr28 4 143 1% resistors (0603) r34, r35 2 4.99k 1% resistors (0603) part type MAX3674EVKIT+ ev kit + denotes lead-free/rohs-compliant.
evaluates: max3674 max3674 evaluation kit 2 _______________________________________________________________________________________ component list (continued) designation qty description tp1Ctp7, tp10 8 test points keystone 5000 u1 1 high-performance dual-output network clock synthesizer (48 lqfp) maxim max3674ecm+ u2 1 microcontroller (28 so) microchip pic16c745-i/so u3 1 dual level translator (8 sot23) maxim max3373eeka+ u4 1 i/o port expander (24 tqfn) maxim max7312atg+ designation qty description u5 1 buffer (5 sc-70) fairchild nc7sv125p5x y1 1 16.000mhz smd crystal, 18pf citizen hcm49-16.000mabj-ut y2 1 6.000mhz smd crystal, 32pf ecs ecs-60-32-5pxdn-tr none 2 shunts for j5 sullins ssc02syan none 1 pcb: max3674 ev kit+ circuit board, rev a quick start note: in the following sections, software-related items are identified by bolding. text in bold refers to items directly from the ev kit software. text in bold and underlined refers to items from the windows operating system. 1) install two shunts on jumper j5, both to the (l) posi- tion. this sets address pins adr0 and adr1 low. 2) connect a +3.3v supply to vcc (j6) and gnd (j7). set the supply current limit to 200ma. 3) connect the computer to the ev kit with a usb cable (a-male to mini-b-male). led d2 should switch on, indicating that usb power is detected. 4) to download the latest version of the ev kit software (max3674revx.zip), visit the maxim website at www.maxim-ic.com/evkitsoftware . uncompress the zip file to a local folder and run the installation file (setup.exe). installation requires administrative rights and may also require internet access to download necessary drivers. 5) after installation is complete, follow this path to start the program: start all programs maxim integrated products max3674 evaluation kit 6) press the initialize / test communication button. the message box should report: usb device detected max3674 detected max7312 detected 7) press the following buttons in this order: reset load read . at this point, the lock output should be high (led d1 on), indicating that the pll is locked. 8) set the values for p , na , nb , and m to obtain the desired output frequency. 9) press the load button, followed by the read button. 10) connect the clock outputs (qa, qa , qb, qb ) to test equipment with sma cables. terminate unused out- puts. windows is a registered trademark of microsoft corp.
detailed description the max3674 ev kit simplifies evaluation by providing the hardware and software needed to evaluate all the max3674 functions. a microcontroller (microchip pic16c745) and i/o port expander (max7312) allow the user to set control pins and read/write registers with software. the on-board 16mhz crystal and integrated oscillator generate the pll reference clock. alternatively, an external clock source can be connect- ed to the ref_clk input to serve as the reference clock. led d1 switches on when the lock output is high, indicating the pll is locked. the microcontroller is powered by the usb port +5v supply. led d2 switches on when usb power is detected. the max3674 and i/o port expander are powered by the +3.3v supply. the ev kit also includes the max3373 level translator that interfaces the i 2 c clock and data lines from the microcontroller to the max3674 and i/o port expander, and is powered by both supplies. the usb cable and +3.3v supply can be connected to the ev kit in any sequence. master reset it is recommended to press the reset button after every power-up. lvpecl clock outputs the lvpecl clock outputs (qa, qa , qb, qb ) have on- board bias-ts that provide dc biasing and ac-couple the signal to allow direct connection to 50 -terminated test equipment. unused outputs should be terminated to prevent reflections on the transmission lines. reference clock input the ref_clk input (j17) accepts sinusoidal or square- wave clocks with frequencies between 15mhz and 20mhz, and swings up to 3.3v p-p . this input has a 50 dc termination to ground and is ac-coupled to an on- board buffer. the buffer is used to square the clock signal applied to the ref_clk input pin. i 2 c slave address jumper j5 is used to set the two selectable address bits (adr0 and adr1). the ev kit software performs a search at power-up to determine which of the four pos- sible slave addresses is being used. ev kit software the ev kit software provides an easy way to set opera- tional modes and read/write internal registers (figure 1). refer to the max3674 data sheet for detailed descriptions of the max3674 functions and guidance on selecting dividers settings. note that when the programming interface is set to i2c , the settings for dividers p , na , nb , and m are configured within the max3674 after pressing the load button. evaluates: max3674 max3674 evaluation kit _______________________________________________________________________________________ 3
evaluates: max3674 max3674 evaluation kit 4 _______________________________________________________________________________________ figure 1. max3674 ev kit software
evaluates: max3674 tp5 tp3 tp6 led d2 usb_pwr 21 tp10 tp7 tp2 clk_stopb tp4 clk_stopa 1 v cc 2 bypass tp1 3 gnd 4 v cc 5 v cc_pll 6 ref_sel 7 ref_clk 8 gnd 9 clk_stopa 10 clk_stopb 11 xtal1 12 xtal2 1 i/o0 2 i/o1 3 i/o2 4 i/o3 5 i/o4 6 i/o5 7 i/o6 8 i/o7 9 gnd 10 i/o8 11 i/o9 12 i/o10 36 v cc 25 test_en 26 lock 27 gnd 28 qb 29 qb 30 v cc 31 gnd 32 qa 33 qa 34 v cc 35 nb 18 ad0 17 i/o15 16 i/o14 15 i/o13 14 i/o12 13 i/o11 24 ad2 23 ad1 22 int 21 v+ 20 sda 19 scl c41 0.22 f c42 0.22 f c47 0.1 f c9 0.1 f c8 0.1 f c13 0.1 f c12 0.1 f c11 0.1 f r24 680 r5 1.5k r2 10 r23 10k r22 10k r6 4.75k r7 4.75k r8 4.75k r9 4.75k r10 4.75k r11 4.75k r12 10k r13 10k r3 470 r27 143 l7 ferrite bead c33 0.1 f c35 0.01 f c31 0.1 f c30 1 f c4 open c3 open c10 0.01 f c29 0.1 f c40 0.1 f c6 22 f c21 0.1 f c22 0.1 f c32 4.7 f c34 22 f c19 4.7 f c20 0.1 f vcc vcc vcc vcc vcc max3674 u1 max3373 u3 max7312 u4 1 oe 2 a 3 gnd 5 vcc 4 y c5 0.1 f c48 0.1 f y1 16.0mhz 12 r34 4.99k r35 4.99k r1 49.9 vcc vcc u5 nc7sv125p5x j17 smapcb ref_clk 13 v cc 14 m0 15 m1 16 m2 17 m3 18 m4 19 gnd 20 m5 21 m6 22 m7 23 m8 24 m9 1 mclr 2 ra0 3 ra1 4 ra2 5 ra3 6 ra4 28 rb7 u2 pic16c745 27 rb6 26 rb5 25 rb4 24 rb3 23 rb2 22 rb1 21 rb0 20 vdd 19 vss 18 rc7 17 rc6 16 15 d- d+ 7 ra5 8 vss 9 osc1 10 osc2 11 rc0 12 rc1 13 rc2 14 vusb r25 143 l5 ferrite bead r28 143 l6 ferrite bead r26 143 l4 ferrite bead vcc j12 j13 sma qb sma qb c7 0.22 f c14 0.22 f j10 j11 sma qa sma qa led d1 2 1 lock lock 48 p 37 gnd 38 na2 39 na1 40 na0 41 pload 42 v cc 43 mr 44 sda 45 scl 46 adr1 47 adr0 1 vbus 2 d- 3 d+ 4 nc 5 gnd j1 mini-b usb 1 i/o v cc 2 2 gnd 3 v l 4 i/o v l 2 vusb vusb c24 0.1 f c23 1 f c26 0.1 f c25 1 f c28 0.1 f c27 1 f vcc vcc vcc vusb r4 4.75k c2 33pf c1 33pf y2 6.0mhz 12 c18 0.1 f c17 1 f c15 4.7 f c16 4.7 f l1 22 h vusb j5 2 1 4 3 6 5 vcc vcc 5 i/o v l 1 6 three-state 7 v cc 8 i/o v cc 1 vcc vcc vusb scl sda sda scl l2 4.7 h j6 vcc j7 gnd vcc max3674 evaluation kit _______________________________________________________________________________________ 5 figure 2. max3674 ev kit schematic
evaluates: max3674 max3674 evaluation kit 6 _______________________________________________________________________________________ figure 3. max3674 ev kit component placement guide?omponent side
evaluates: max3674 figure 4. max3674 ev kit pcb layout?omponent side max3674 evaluation kit _______________________________________________________________________________________ 7
evaluates: max3674 max3674 evaluation kit 8 _______________________________________________________________________________________ figure 5. max3674 ev kit pcb layout?round plane
evaluates: max3674 figure 6. max3674 ev kit pcb layout?ower plane max3674 evaluation kit _______________________________________________________________________________________ 9
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. 10 __________________ maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2008 maxim integrated products is a registered trademark of maxim integrated products, inc. evaluates: max3674 max3674 evaluation kit figure 7. max3674 ev kit pcb layout?older side
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