19-2610 Rev 0; 10/02 MAX3663 Evaluation Kit Features ♦ Fully Assembled and Tested ♦ +3.3V or +5V Operation ♦ On-Board Input Termination ♦ Independent Electrical Monitoring of Modulation and Bias Currents Component Suppliers SUPPLIER PHONE FAX AVX 843-448-9411 843-448-1943 Coilcraft 847-639-6400 847-639-1469 Murata 770-436-1300 770-436-3030 Zetex 631-360-2222 631-360-8222 Ordering Information PART MAX3663EVKIT TEMP RANGE IC PACKAGE -40°C to +85°C 24 QFN Note: Please indicate that you are using the MAX3663 when contacting these component suppliers. Component List for Electrical Configuration DESIGNATION QTY DESCRIPTION C1, C2, C6, C12, C20 5 0.01µF ±10% ceramic capacitors (0402) C4, C7, C10, C11 4 1µF ±10% ceramic capacitors (0603) C5 1 Do not install C8 1 100pF ±10% ceramic capacitor (0402) 1 0.1µF ±10% ceramic capacitor (0603) C16 C19 1 C21 1 10µF ±10%, 10V min tantalum capacitor case B AVX TAJC106K016 5pF ±5% ceramic capacitor (0402) D1 1 LED J1, J2, J3 3 SMA connectors, edge mount JU1–JU4 4 3-pin headers, 0.1in centers L2 1 DESIGNATION QTY R5 1 12.4Ω ±1% resistor (0402) DESCRIPTION R6, R7, R21 3 84.5Ω ±1% resistors (0603) R8, R9 2 124Ω ±1% resistors (0603) R10, R11 2 20Ω ±1% resistors (0402) R12 1 10Ω ±1% resistor (0402) R13, R22 2 0Ω resistors (0603) R14 1 50kΩ variable resistor Bourns 3296W R15 1 200kΩ variable resistor Bourns 3296W R16 1 100kΩ variable resistor Bourns 3296W R18 1 110Ω ±5% resistor (0603) R20 1 0Ω resistor (0402) R23 1 15Ω ±5% resistor (0603) R26, R28 2 392Ω ±1% resistors (0402) Open U1 1 MAX3663 24-pin QFN 1 MAX495ESA 8-pin SOIC 1 1.2µH inductor Coilcraft 1008LS-122XKBC U2 15 Test points Q1 1 PNP transistor Zetex FMMT591A VCC, GND, TP1–TP13 None 1 MAX3663 data sheet R1, R2, R24 3 1.5kΩ ±5% resistors (0402) None 1 R3 1 1kΩ ±5% resistor (0603) MAX3663ETG EV kit PC board, rev A R4, R17, R25, R27, R29 5 Do not install L3 ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 Evaluates: MAX3663 General Description The MAX3663 evaluation kit (EV kit) is an assembled demonstration board that provides easy optical or electrical evaluation of the MAX3663, a 622Mbps laser driver with current monitors and automatic power control (APC) circuitry. Although the MAX3663 EV kit is shipped in the electrical configuration, this EV kit also provides configuration instructions for optical operation. Evaluates: MAX3663 MAX3663 Evaluation Kit Component Modifications for Optical Configuration DESIGNATION QTY D3 1 User-supplied laser diode DESCRIPTION J3 1 Remove L2 1 Ferrite bead Murata BLM18HG601SN1 R5 1 Remove Optical Setup R13 1 Remove R19 1 20Ω ±5% resistor (0402) R20 1 5Ω ±5% resistor (0402) R22 1 Remove R23 1 Remove For optical operation, the electrical APC test circuit must be disabled. For optical evaluation of the MAX3663, configure the EV kit as described in the Component Modifications for Optical Configuration table: 1) Shunt JU4 to ground to enable the output. Quick Start 2) Connect a TO-style header laser and monitor diode (Figure 1) as follows: Electrical Setup (Default) • Keeping the leads to the laser diode as short as possible, connect the laser diode on the component side of the board between R20 and VCC with the cathode connected to R20 and the anode connected to VCC. • Connect the monitor diode on the underside of the the board with the anode connected to the MAX3663’s MD pin and the cathode connected to VCC. Note: When performing resistance checks, manually set the ohmmeter to a high range to avoid forward biasing the on-chip ESD protection diodes. In the electrical configuration, an APC test circuit is included to emulate a semiconductor laser with a monitor photodiode. Monitor diode current is provided by Q1, which is controlled by an operational amplifier (U2). The APC test circuit, consisting of U2 and Q1, applies the simulated monitor diode current to the MAX3663’s MD pin. The ratio of IBIAS / IMD is R24 / R23 = 100. To ensure proper operation in the electrical configuration, set up the evaluation board as follows: 1) Verify that inductor L2 is not installed. 2) Shunt JU4 to ground to enable the output. Note: When performing the following resistance checks, manually set the ohmmeter to a high range to avoid forward biasing the on-chip ESD protection diodes. 3) Shunt JU2 to R14. Adjust R14, the MOD (RMODSET) potentiometer, for 10kΩ resistance between pins 2 and 3 (test point 5 and ground). 4) Shunt JU1 to R15. Adjust R15, the BIAS (RBIASMAX) potentiometer, for 10kΩ resistance between pins 2 and 3 (test point 4 and ground). 5) Shunt JU3 to R16. Adjust R16, the APC (RAPCSET) potentiometer, for 10kΩ resistance between pins 2 and 3 (test point 6 and ground). 6) Power up the board with a +3.3V supply. 7) Apply a differential input signal (max amplitude ≤800mV per side) to J1 and J2 (DATA+ and DATA-). 2 8) Attach a high-speed oscilloscope with 50Ω inputs to J3. 9) Adjust RBIASMAX (R15) and RAPCSET (R16) until the desired laser bias current is achieved (refer to the note in the Applications Information section of the MAX3663 data sheet). 10) Adjust RMODSET (R14) until the desired laser-modulation current is achieved. Note: See the Adjustment and Control Descriptions table. 3) Shunt JU2 to R14. Adjust R14, the MOD (RMODSET) potentiometer, for maximum resistance between pins 2 and 3 (test point 5 and ground). 4) Shunt JU1 to R15. Adjust R15, the BIAS (RBIASMAX) potentiometer, for maximum resistance between pins 2 and 3 (test point 4 and ground). 5) Shunt JU3 to R16. Adjust R16, the APC (RAPCSET) potentiometer, for desired optical power. (Refer to the Design Procedure section of the MAX3663 data sheet.) 6) Power up the board with a +3.3V supply. 7) Apply a differential input signal (≤800mV per side) to J1 and J2 (DATA+ and DATA-). 8) Attach the laser-diode output to an optical/electrical converter. _______________________________________________________________________________________ MAX3663 Evaluation Kit 10) Adjust R14 until the desired optical amplitude is achieved. Optical amplitude can be observed on an oscilloscope connected to an optical/electrical converter. Adjustment and Control Descriptions See Quick Start first. COMPONENT NAME FUNCTION D1 APC Fail Indicator LED Refer to the Design Procedure section of the MAX3663 data sheet. Set the APC current, and then increase the bias current until the LED goes off (the LED is illuminated when the APC loop is open and off when the APC loop is closed). J3 Electrical Output SMA Electrical Output. Remove for optical operation. JU1 RBIASMAX Selector Selects RBIASMAX resistor. Shunt to supplied potentiometer R15 or to fixed resistor R17. JU2 RMODSET Selector Selects RMODSET resistor. Shunt to supplied potentiometer R14 or to fixed resistor R25. JU3 RAPCSET Selector Selects RAPCSET resistor. Shunt to supplied potentiometer R16 or to fixed resistor R4. JU4 OUTPUT DISABLE Enable/Disable the Output Currents. Shunt to VCC to disable the part. Shunt to ground or leave open to enable the part. R14 RMODSET Laser Modulation Current Adjustment R15 RBIASMAX Laser Bias-Current Adjustment. In open-loop mode, R15 adjusts the laser bias current. In closed-loop operation, R15 adjusts the maximum laser bias current. R16 RAPCSET Automatic Power-Control Adjustment. For closed-loop operation, R16 adjusts the monitor-diode current level. TP1 Fail Indicator Test Point TTL low level indicates a failure in the APC loop. _______________________________________________________________________________________ 3 Evaluates: MAX3663 9) Adjust R15 until LED D1 is no longer illuminated. Laser power can be monitored at the laser diode with an optical/electrical converter (refer to the note in the Applications Information section of the MAX3663 data sheet). Evaluates: MAX3663 MAX3663 Evaluation Kit CONFIGURATION 1 CONFIGURATION 2 TOP OF PC BOARD TOP OF PC BOARD L2 L2 VCC VCC VCC D3 D3 TO-46 CAN LASER/PHOTODIODE PAIR LD SOLDER BRIDGES VCC TO-46 CAN LASER/PHOTODIODE PAIR LD BOTTOM OF PC BOARD PD BOTTOM OF PC BOARD PD VCC VCC SOLDER BRIDGES CONFIGURATION 3 TOP OF PC BOARD L2 L2 VCC VCC VCC CONFIGURATION 4 TOP OF PC BOARD VCC VCC D3 D3 TO-46 CAN LASER/PHOTODIODE PAIR LD BOTTOM OF PC BOARD SOLDER BRIDGES VCC PD VCC VCC LD TO-46 CAN LASER/PHOTODIODE PAIR BOTTOM OF PC BOARD SOLDER BRIDGES PD VCC VCC Figure 1. Attachment of Laser Diode/Monitor Diode to MAX3663 EV Kit 4 _______________________________________________________________________________________ _______________________________________________________________________________________ DATA- DATA+ CW J2 J1 GND VCC 1µF C11 1µF R8 124Ω R6 84.5Ω C10 VCC R9 124Ω R7 84.5Ω L3 1.2µF R21 84.5Ω VCC C19 10µF VCC R17 C12 0.01µF VCC JU4 6 5 TP13 TP2 TP3 7 MODMON BIASMON GND DATA- DATA+ 24 R1 1.5kΩ VCC TP7 TP12 VCC TP8 4 3 2 1 JU1 VCC C20 0.01µF R27 OPEN TP11 R29 OPEN C2 0.01µF R26 392Ω R28 392Ω VCC CW OPEN R15 200kΩ RBIASMAX VCC 8 23 TP4 22 R2 1.5kΩ TP5 U1 21 9 D1 RED 10 20 R3 1.0kΩ TP6 MAX3663 TP1 R18 110Ω BIASMAX ENABLE CW JU2 MODSET GND R25 GND FAIL OPEN R14 50kΩ RMODSET APCSET N.C. JU3 MD 19 VCC C5 OPEN 11 12 VCC GND MD VCC VCC OUT+ R13 0Ω Q1 3 2 1 6 VCC VCC 2 7 1µF C4 R22 0Ω TP9 TP10 C7 1µF 10Ω R12 C8 100pF R23 15Ω VCC L2 OPEN C6 0.01µF U2 3 4 20Ω R10 20Ω R11 BIAS VCC BIAS 13 14 15 16 17 18 C1 0.01µF C16 0.1µF OUT- R24 1.5kΩ CAPC GND R4 VCC BIAS C21 5pF R19 OPEN R20 0Ω J3 R5 12.4Ω MD OUT Evaluates: MAX3663 OPEN R16 100kΩ RAPCSET MAX3663 Evaluation Kit Figure 2. MAX3663 EV Kit Schematic—Electrical Configuration 5 DATA- DATA+ CW J2 J1 Figure 3. MAX3663 EV Kit Schematic—Optical Configuration _______________________________________________________________________________________ GND VCC R8 124Ω 1µF C11 1µF R6 84.5Ω C10 VCC R9 124Ω R7 84.5Ω L3 1.2µH R21 84.5Ω VCC CW C12 0.01µF TP8 TP2 C20 0.01µF TP3 7 MODMON BIASMON GND DATA- DATA+ VCC 24 R1 1.5kΩ TP13 TP7 TP12 JU4 6 5 4 3 2 1 JU1 VCC VCC R27 OPEN TP11 R29 OPEN R28 392Ω VCC C19 10µF VCC C2 0.01µF R26 392Ω CW OPEN R15 200kΩ RBIASMAX R17 VCC JU2 VCC 8 23 TP4 22 R2 1.5kΩ TP5 U1 21 9 D1 RED 10 TP6 11 OPEN C5 20 R3 1.0kΩ MAX3663 TP1 R18 110Ω BIASMAX ENABLE OPEN R14 50kΩ RMODSET MODSET GND R25 GND FAIL JU3 APCSET OPEN R16 100kΩ RAPCSET 19 VCC MD 12 MD VCC VCC OUT+ OUT- VCC R13 OPEN Q1 3 2 1 6 VCC VCC L2 1µF C4 2 7 C6 0.01µF U2 3 4 TP10 R23 TP9 OPEN R22 OPEN VCC C7 1µF 10Ω R12 C8 100pF MURATA BLM18HG601SN1 20Ω R10 20Ω R11 BIAS VCC BIAS 13 14 15 16 17 18 C1 0.01µF C16 0.1µF GND R24 1.5kΩ CAPC GND R4 VCC BIAS 6 N.C. C21 5pF R19 20Ω R20 5Ω R5 OPEN D3 VCC MD Evaluates: MAX3663 MAX3663 Evaluation Kit MAX3663 Evaluation Kit Evaluates: MAX3663 1.0" Figure 4. MAX3663 EV Kit Component Placement Guide—Component Side _______________________________________________________________________________________ 7 Evaluates: MAX3663 MAX3663 Evaluation Kit 1.0" Figure 5. MAX3663 EV Kit PC Board Layout—Component Side 8 1.0" Figure 6. MAX3663 EV Kit PC Board Layout—Solder Side _______________________________________________________________________________________ MAX3663 Evaluation Kit Evaluates: MAX3663 1.0" 1.0" Figure 7. MAX3663 EV Kit PC Board Layout—Ground Plane Figure 8. MAX3663 EV Kit PC Board Layout—Power Plane 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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