+Denotes lead-free/rohs-compliant. J5 1 J10 J13 4 J17 1 L1 1 L2 1 L4 L7 4

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1 ; Rev 0; 5/08 E V A L U A T I O N K I T A V A I L A B L E General Description The MAX3674 evaluation kit (EV kit) is a fully assembled and tested demonstration board that simplifies evaluation of the MAX3674 high-performance dual-output network clock synthesizer. The EV kit includes a 16MHz crystal and other hardware components necessary to evaluate all the MAX3674 functions. Software is provided that communicates with the EV kit through a USB port. The software provides an easy way to set operational 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. DESIGNATION QTY DESCRIPTION C1, C2 2 C3, C4 0 Not installed C5, C18, C20, C21, C22, C24, C26, C28, C29, C31, C33 11 C6, C34 2 C7, C14, C41, C42 C8, C9, C11, C12, C13, C40, C47, C C10 1 C15, C16, C19, C32 C17, C23, C25, C27, C C35 1 D1, D2 2 J1 1 33pF ±10% ceramic capacitors (0402) ±10% ceramic capacitors (0603) 22μF ±10% ceramic capacitors (1206) 0.22μF ±10% ceramic capacitors (0402) ±10% ceramic capacitors (0402) 0.01μF ±10% ceramic capacitor (0402) 4.7μF ±10% ceramic capacitors (0805) 1μF ±10% ceramic capacitors (0603) 0.01μF ±10% ceramic capacitor (0603) LEDs, green Panasonic LN38GPX Mini USB connector, B type Tyco MAX3674 Evaluation Kit 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 PART MAX3674EVKIT+ +Denotes lead-free/rohs-compliant. Features Ordering Information Component List DESIGNATION QTY DESCRIPTION J5 1 J6, J7 2 J10 J13 4 J17 1 L1 1 L2 1 2 x 3 pin header (0.1in centers) Sullins PEC36SAAN Test points Keystone 5000 TYPE EV Kit SMA connectors, edge-mount, tab center Johnson SMA connector, PCB mount Johnson μH ±20% inductor, 520mA Taiyo-Yuden CBC3225T220M 4.7μH ±20% inductor, 870mA Taiyo-Yuden CBC3225T4R7M L4 L7 4 Ferrite beads Murata BLM18HK102SN1 (0603) R1, R ±1% resistors (0603) R ±1% resistor (0603) R ±1% resistor (0603) R4, R6 R k ±1% resistors (0603) R k ±1% resistor (0603) R12, R13, R22, R k ±1% resistors (0603) R ±1% resistor (0603) R25 R ±1% resistors (0603) R34, R k ±1% resistors (0603) Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim s website at

2 DESIGNATION QTY DESCRIPTION TP1 TP7, TP10 8 U1 1 U2 1 U3 1 U4 1 Test points Keystone 5000 High-performance dual-output network clock synthesizer (48 LQFP) Maxim Microsemi MAX3674ECM+ Microcontroller (28 SO) Microchip PIC16C745-I/SO Dual level translator (8 SOT23) Maxim MAX3373EEKA+ I/O port expander (24 TQFN) Maxim MAX7312ATG+ 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) position. This sets address pins ADR0 and ADR1 low. 2) Connect a +3.3V supply to (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 of the EV kit software the (MAX3674revX.zip), Microsemi website visit at the Maxim website at Uncompress the zip file to a local folder Uncompress and run the installation the zip file to file a local (setup.exe). folder and Installation run the installation requires administrative file (setup.exe). rights Installation and may requires also require administrative Internet access rights to and download may also necessary require drivers. Internet access to download necessary drivers. Component List (continued) DESIGNATION QTY DESCRIPTION U5 1 Y1 1 Y2 1 None 2 None 1 Buffer (5 SC-70) Fairchild NC7SV125P5X MHz SMD crystal, 18pF Citizen HCM MABJ-UT 6.000MHz SMD crystal, 32pF ECS ECS PXDN-TR Shunts for J5 Sullins SSC02SYAN PCB: MAX3674 EV Kit+ Circuit Board, Rev A 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 outputs. Windows is a registered trademark of Microsoft Corp. 2

3 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 connected 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. MAX3674 Evaluation Kit LVPECL Clock Outputs The LVPECL clock outputs (QA, QA, QB, QB) have onboard bias-ts that provide DC biasing and AC-couple the signal to allow direct connection to 50Ω-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 squarewave clocks with frequencies between 15MHz and 20MHz, and swings up to 3.3V P-P. This input has a 50Ω DC termination to ground and is AC-coupled to an onboard 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 possible slave addresses is being used. EV Kit Software The EV kit software provides an easy way to set operational 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. 3

4 Figure 1. MAX3674 EV Kit Software 4

5 C40 TP7 TP10 LOCK 1 I/O0 2 I/O1 3 I/O2 4 I/O3 5 I/O4 6 I/O5 R5 1.5kΩ R6 R7 R8 R9 R10 R11 R12 R kΩ 4.75kΩ 4.75kΩ 4.75kΩ 4.75kΩ 4.75kΩ 10kΩ 10kΩ 28 LED D2 R24 680Ω 2 1 R2 10Ω 18 AD0 C μF I/O15 16 I/O14 15 I/O13 U5 NC7SV125P5X C48 14 I/O12 J17 C5 R34 SMAPCB 1 13 OE I/O kΩ REF_CLK 2 A TP4 TP2 CLK_STOPA CLK_STOPB R22 10kΩ TP1 C11 C8 C9 C13 L5 L4 FERRITE BEAD FERRITE BEAD 36 C μF NB 34 C14 33 QA 0.22μF 32 QA C41 U1 31 C47 GND 0.22μF 30 MAX C42 QB 0.22μF 28 QB 27 GND 26 L7 L6 LOCK FERRITE BEAD FERRITE BEAD 25 TEST_EN R27 143Ω R3 470Ω 7 I/O6 AD I/O7 9 GND 10 I/O8 11 I/O9 12 I/O10 AD1 INT V+ SDA SCL C30 1μF C22 C31 C21 U4 MAX C19 C μF 3 R1 R35 GND 49.9Ω 4.99kΩ C μF C4 OPEN U3 I/O 1 MAX3373 THREE-STATE I/O VL1 1 2 BYPASS 3 GND 4 5 _PLL 6 REF_SEL 7 REF_CLK 8 GND 9 CLK_STOPA 10 CLK_STOPB 11 XTAL1 Y MHz XTAL2 1 2 C3 OPEN Y M0 15 M1 16 M2 17 M3 18 M4 19 GND 20 M5 21 M6 22 M7 23 M8 24 M9 U2 PIC16C745 1 MCLR RB7 2 RA0 RB6 3 RA1 RB5 4 RA2 RB4 5 RA3 RB3 6 RA4 RB2 7 RA5 RB1 8 VSS RB0 9 OSC1 VDD 10 OSC2 VSS 11 RC0 RC7 12 RC1 RC6 13 RC2 D+ 14 VUSB D VUSB SCL SDA 1 I/O 2 2 GND 3 VL C29 4 I/O VL2 R23 10kΩ C12 R25 R26 143Ω 143Ω R28 143Ω J10 SMA QA J11 SMA QA J12 SMA QB J13 SMA QB LED D1 LOCK 2 1 P ADR0 ADR1 SCL SDA MR PLOAD NA0 NA1 NA2 GND C2 33pF VUSB R4 4.75kΩ Y2 6.0MHz 1 2 C1 33pF C23 C24 1μF VUSB C25 1μF USB_PWR J1 VUSB TP6 L1 MINI-B USB 22μH 1 VBUS 2 D- 3 D+ C16 C15 C17 C18 4 NC 4.7μF 4.7μF 1μF 5 GND C26 VUSB TP5 L2 4.7μH J6 C27 C28 TP3 C35 C33 C32 C34 1μF 0.01μF 4.7μF 22μF J7 GND SDA SCL J MAX3674 Evaluation Kit Figure 2. MAX3674 EV Kit Schematic 5

6 Figure 3. MAX3674 EV Kit Component Placement Guide Component Side 6

7 Figure 4. MAX3674 EV Kit PCB Layout Component Side 7

8 Figure 5. MAX3674 EV Kit PCB Layout Ground Plane 8

9 Figure 6. MAX3674 EV Kit PCB Layout Power Plane 9

10 Figure 7. MAX3674 EV Kit PCB Layout Solder Side 10

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