19-4273; Rev 0; 9/08 EVALUATION KIT AVAILABLE MAX3678 Evaluation Kit The MAX3678 evaluation kit (EV kit) is a fully assembled and tested demonstration board that simplifies evaluation of the MAX3678 low-jitter frequency synthesizer with intelligent dynamic switching (IDS). The EV kit includes slide switches to allow easy selection of different modes of operation. Clock I/Os have SMA connectors and are AC-coupled to simplify connection to test equipment. The EV kit is powered by a +3.3V supply and uses LEDs for signal status indicators. Features ♦ Fully Assembled and Tested ♦ Slide Switches for Mode Control ♦ SMA Connectors and AC-Coupled Clock I/Os ♦ Powered by +3.3V Supply ♦ LED Signal Status Indicators Ordering Information PART TYPE MAX3678EVKIT+ EV Kit +Denotes lead-free/RoHS compliant. Component List DESIGNATION QTY C1, C6, C7 C11–C13, C16, C18–C22, C24–C27, C29, C30, C32–C39, C41, C42, C46–C50, C62, C63 35 DESCRIPTION 0.1μF ±10% ceramic capacitors (0402) DESIGNATION QTY DESCRIPTION R1–R5, R15, R16, R17, R37–R46 18 143 ±1% resistors (0402) R6–R11 6 49.9 ±1% resistors (0402) R12, R13, R14, R18–R22 8 332 ±1% resistors (0603) R23, R24, R25 3 10k ±1% resistors (0603) S1 1 Switch, momentary, SPST-NO Panasonic EVQQ2S02W S2–S5 4 Switches, slide, SPDT Copal Electronics CUS-12TB C2 1 33μF ±5% tantalum capacitor (B case) C3 1 2.2μF ±10% ceramic capacitor (0805) C4 1 0.1μF ±10% ceramic capacitor (0603) C5 1 0.01μF ±10% ceramic capacitor (0603) S6, S7, S8 3 C28 1 0.22μF ±10% ceramic capacitor (0402) Switches, slide, SP4T Copal Electronics CUS-14TB S9, S10 2 D1, D3, D5, D6, D8 5 Green SMD LEDs (1206) Panasonic LNJ311G8PRA Switches, slide, SP3T Copal Electronics CUS-13TB TP1, TP3, TP20 3 Test points Keystone 5000 D2, D4, D7 3 U1–U4 4 Dual inverters (6 SC-70) TI SN74LVC2G14DCKR U7 1 Low-jitter, frequency synthesizer with intelligent dynamic switching (56 TQFN) Maxim MAX3678UTN+ Microsemi MAX3678UTN+ None 1 PCB: MAX3678 EV Kit+ Circuit Board, Rev A Red SMD LEDs (1206) Panasonic LNJ211R8ARA J1, J2, J5–J12, J14, J15, J19, J20, J22–J29, J44, J45 24 J4, J13 2 Test points Keystone 5000 L13 1 4.7μH ±20% inductor Taiyo Yuden CBC3225T4R7M SMA connectors, edge-mount, tab center Johnson 142-0701-851 ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 Evaluates: MAX3678 General Description Evaluates: MAX3678 MAX3678 Evaluation Kit Quick Start 1) Set the slide switches to the following settings: PLL_BYPASS = NORMAL SEL_CLK = REFCLK0 IDS_MODE = AUTO DM = 133.33M DA = 133.33M DB = 133.33M OUTA_EN = A0, A1 Detailed Description The MAX3678 EV kit simplifies evaluation by providing the hardware needed to evaluate all the MAX3678 functions. Table 1 contains functional descriptions for the switches and indicators. Clock Inputs OUTB_EN = B0 FB_SEL = INTERNAL 2) Connect a +3.3V supply to VCC (J13) and GND (J4). Set the supply current limit to 450mA. 3) Using SMA cables, connect a low-jitter 133.33MHz differential clock source to the REFCLK0 input. Verify that the green LEDs switch on for CLK_SELECTED (REFCLK0), IN0FAIL, and LOCK. 4) Using SMA cables, connect the OUTA0 output to test equipment. Terminate all unused enabled outputs (OUTB0 and OUTA1). The clock inputs (REFCLK0, REFCLK1, FB_IN) are ACcoupled at the SMA connectors and have on-board 100Ω differential terminations. For optimal jitter performance it is critical to use a low-jitter, differential, square-wave clock source. If such a source is not available, the clock inputs can be driven with a single-ended sinusoidal or square-wave clock source for functional testing. Clock Outputs The clock outputs (OUTA[3:0], OUTB[4:0]) have onboard DC-biasing and are AC-coupled at the SMA connectors to allow direct connection to 50Ω-terminated test equipment. Unused outputs should be disabled (using switches S9 and S10) or have 50Ω terminations placed on the SMA connectors. Table 1. Switch and Indicator Descriptions COMPONENT NAME FUNCTION Momentary switch to reset internal dividers. Not required at power-up. If the output divider settings (DA, DB) are changed on the fly, a reset is required to phase align the outputs. S1 MASTER RESET S2 PLL_BYPASS S3 SEL_CLK S4 IDS_MODE Selects IDS mode of operation. Auto mode allows IDS to automatically select the reference clock input. Manual mode forces IDS to select the reference clock input selected by SEL_CLK. S5 FB_SEL Selects internal or external feedback for the PLL. If external is selected, connect any of the A-group or B-group outputs to the FB_IN input. If DA DB, a B-group output must be used. S6 DM Selects the frequency of the reference clock inputs. S7 DA Selects the frequency of the A-group clock outputs. Selects normal PLL operation or PLL bypass. Selects the reference clock input (see IDS_MODE). S8 DB S9 OUTA_EN Selects which A-group outputs are enabled (see note). Selects the frequency of the B-group clock outputs. S10 OUTB_EN Selects which B-group outputs are enabled (see note). D1, D2 IN0FAIL REFCLK0 failure indicator (green = pass, red = fail). D3, D4 IN1FAIL REFCLK1 failure indicator (green = pass, red = fail). D5, D6 CLK_SELECTED D7, D8 LOCK PLL lock indicator (green = PLL locked, red = PLL not locked). TP1 BUSY Test point for BUSY indicator. Low indicates IDS is busy switching reference clocks. Indicates which reference clock input is being used by the PLL. Note: Setting OUTA_EN = “—” and OUTB_EN = “B0” at the same time enables a factory test mode and is not a valid mode of operation. 2 _______________________________________________________________________________________ MAX3678 Evaluation Kit Evaluates: MAX3678 Figure 1. MAX3678 EV Kit Schematic _______________________________________________________________________________________ 3 Evaluates: MAX3678 MAX3678 Evaluation Kit Figure 2. MAX3678 EV Kit Component Placement Guide—Component Side 4 _______________________________________________________________________________________ MAX3678 Evaluation Kit Evaluates: MAX3678 Figure 3. MAX3678 EV Kit PCB Layout—Component Side _______________________________________________________________________________________ 5 Evaluates: MAX3678 MAX3678 Evaluation Kit Figure 4. MAX3678 EV Kit PCB Layout—Ground Plane 6 _______________________________________________________________________________________ MAX3678 Evaluation Kit Evaluates: MAX3678 Figure 5. MAX3678 EV Kit PCB Layout—Power Plane _______________________________________________________________________________________ 7 Evaluates: MAX3678 MAX3678 Evaluation Kit Figure 6. MAX3678 EV Kit PCB Layout—Solder Side 8 _______________________________________________________________________________________ MAX3678 Evaluation Kit Evaluates: MAX3678 Figure 7. MAX3678 EV Kit Component Placement Guide—Solder Side Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 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