19-5172; Rev 0; 2/10 EVALUATION KIT AVAILABLE MAX3625B Evaluation Kit The MAX3625B evaluation kit (EV kit) is an assembled demonstration board that provides convenient evaluation of the MAX3625B low-jitter, precision clock generator. The EV kit includes an on-board 25MHz crystal to allow immediate testing. The EV kit includes switches to allow easy selection of different modes of operation. The reference input and clock outputs use SMA connectors and are AC-coupled to simplify connection to test equipment. Features S AC-Coupled I/Os for Ease of Testing S Fully Assembled and Tested S +3.3V Power-Supply Operation S On-Board 25MHz Crystal Ordering Information PART TYPE MAX3625BEVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION C1, C3, C4, C5, C7, C8, C11–C16, C18, C19 QTY DESCRIPTION DESIGNATION QTY R5, R6 0 Not installed DESCRIPTION R7–R10, R14, R15, R16 7 49.9I Q1% resistors (0402) 14 0.1FF Q10% ceramic capacitors (0402) R11 1 10.5I Q1% resistor (0402) C2 1 10FF Q10% ceramic capacitor (0603) SW1, SW2, SW3, SW11 4 SP3T switches C6, C17, C20 3 0.01FF Q10% ceramic capacitors (0402) 5 SPDT switches C9 1 33pF Q10% ceramic capacitor (0402) SW6, SW8, SW9, SW12, SW13 TP6, TP7 2 Test points C10 1 27pF Q10% ceramic capacitor (0402) U1 1 J1, J3, J5 0 Not installed Low-jitter, precision clock generator (24 TSSOP-EP*) Maxim MAX3625BEUG+ Microsemi J2, J48 2 Test points J4 1 2-pin header, 0.1in centers Y1 1 25MHz crystal NDK EXS00A-AT00429 J13–J16, J18, J19, J36 7 SMA connectors — 1 Shunt L1 1 2.7FH inductor 1 PCB: MAX3625B EVALUATION BOARD+, REV A R1–R4, R12, R13 6 150I Q5% resistors (0402) — *EP = Exposed pad. +Denotes a lead(Pb)-free/RoHS-compliant package. Component Supplier SUPPLIER NDK America PHONE 815-544-7900 WEBSITE www.ndk.com/en Note: Indicate that you are using the MAX3625B when contacting this component supplier. 1 Evaluates: MAX3625B General Description Evaluates: MAX3625B MAX3625B Evaluation Kit Quick Start To evaluate the MAX3625B, configure the EV kit as follows: 1) D etermine which output is going to be evaluated and remove the 49.9I termination resistors located near the connectors. Then connect that output to the test equipment using SMA cables. 2) C onnect a +3.3V power supply to J48 (VCC) and J2 (GND). Set the current limit to 200mA. 3) If the on-board crystal is used (IN_SEL set HIGH), the PLL divider should be set to divide by 25 (FB_SEL set LOW) to achieve the standard output rates shown in Table 3. 4) U se Table 3 to set the output divider switches to achieve the output frequency desired. 5) E nable the output under test by setting the related output-enable switch (Qx_OE) HIGH. Table 1. Adjustment and Control Descriptions (see Quick Start first) COMPONENT NAME FUNCTION J4 INDUCTOR SHUNT SW1 SELB1 SW1 and SW2 set the output divider for the QB outputs. See Table 3 for more information. SW2 SELB0 SW1 and SW2 set the output divider for the QB outputs. See Table 3 for more information. SW3 SELA1 SW3 and SW11 set the output divider for the QA outputs. See Table 3 for more information. SW6 BYPASS Set LOW to bypass the PLL. Set HIGH to engage the PLL. Note that when the PLL is bypassed the output dividers are automatically set to divide by 1. SW8 FB_SEL Sets the PLL divider. See Table 2 for more information. SW9 QA_OE Set HIGH to enable LVPECL output QA. Set LOW to force a logic zero at QA. SW11 SELA0 SW3 and SW11 set the output divider for the QA outputs. See Table 3 for more information. SW12 QB_OE Set HIGH to enable the QB LVPECL outputs. Set LOW to force a logic zero at the QB outputs. See Table 3 for more information. SW13 IN_SEL Set HIGH to select the crystal as the frequency source. Set LOW to select the REF_IN as the frequency source. J4 shunts the power-supply inductor. Normal operation is J4 shunted. Table 2. PLL Divider Settings 2 _ Table 3. Output Divider Settings FB_SEL INPUT PLL DIVIDER HIGH ÷24 LOW ÷25 INPUT SELA1/ SELB1 SELA0/ SELB0 NA/NB DIVIDER OUTPUT FREQUENCY (MHz) M = 25 AND XTAL = 25MHz LOW HIGH ÷2 312.5 HIGH LOW ÷4 156.25 HIGH HIGH ÷5 125 LOW LOW ÷10 62.5 QB0 J16 R10 49.9Ω 1% QB0 J15 R9 49.9Ω 1% QB1 J14 R8 49.9Ω 1% C16 0.1µF C15 0.1µF C18 0.1µF J13 C17 0.01µF VCC R7 49.9Ω 1% VCC BYPASS SELB0 SELB1 R3 150Ω C19 0.1µF QA J18 C20 0.01µF TP1 2 3 MR 1 SELB0 BYPASS 22 OB0 23 SELB1 VCCO_B 24 R4 150Ω C14 0.1µF C13 0.1µF 5 QA QB1 20 R15 49.9Ω 1% C11 0.1µF R13 150Ω 4 VCCO_A OB0 21 X_IN 16 C12 0.1µF R12 150Ω 7 J19 QA QB_OE 8 SELB1 SW1 11 VCC C7 0.1µF REF_IN VCC C1 0.1µF 12 SELA0 SELA1 13 C9 33pF C10 27pF J36 GND 14 FB_SEL 10 VCCA X_OUT 15 QA_OE 9 QB_OE QA_OE FB_SEL R16 49.9Ω 1% 6 QA 17 IN_SEL REF_IN 18 MAX3625B QB1 19 IN_SEL R1 150Ω R2 150Ω R14 49.9Ω 1% C8 0.1µF R6 OPEN SELB0 J1 SW2 VCC ALT GND J5 ALT GND J3 ALT GND C2 R11 10µF 10.5Ω 1% SELA0 SELA1 Y1 R5 OPEN J2 GND J48 +3.3V SELA1 C4 0.1µF VCC J4 SW3 C3 0.1µF TP7 L1 2.7µH VCC SELA0 BYPASS IN_SEL FB_SEL QA_OE QB_OE C5 0.1µF TP6 SW11 SW6 SW13 SW8 SW9 SW12 VCC VCC VCC VCC VCC VCC C6 0.01µF VCC Evaluates: MAX3625B QB1 MAX3625B Evaluation Kit Figure 1. MAX3625B EV Kit Schematic 3 Evaluates: MAX3625B MAX3625B Evaluation Kit Figure 2. MAX3625B EV Kit Assembly Drawing—Top Side 4 _ MAX3625B Evaluation Kit Evaluates: MAX3625B Figure 3. MAX3625B EV Kit Layout—Component Side 5 Evaluates: MAX3625B MAX3625B Evaluation Kit Figure 4. MAX3625B EV Kit Layout—Ground Plane 6 _ MAX3625B Evaluation Kit Evaluates: MAX3625B Figure 5. MAX3625B EV Kit Layout—Power Plane 7 Evaluates: MAX3625B MAX3625B Evaluation Kit Figure 6. MAX3625B EV Kit Layout—Solder Side 8 _ MAX3625B Evaluation Kit Evaluates: MAX3625B Figure 7. MAX3625B EV Kit Assembly Drawing—Bottom Side 9 Microsemi Corporation (NASDAQ: MSCC) offers a comprehensive portfolio of semiconductor solutions for: aerospace, defense and security; enterprise and communications; and industrial and alternative energy markets. Products include high-performance, high-reliability analog and RF devices, mixed signal and RF integrated circuits, customizable SoCs, FPGAs, and complete subsystems. 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