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| 19-2610 Rev 0; 10/02 MAX3663 Evaluation Kit 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. o Fully Assembled and Tested o +3.3V or +5V Operation o On-Board Input Termination o Independent Electrical Monitoring of Modulation and Bias Currents Features Evaluates: MAX3663 Component Suppliers SUPPLIER AVX Coilcraft Murata Zetex PHONE 843-448-9411 847-639-6400 770-436-1300 631-360-2222 FAX 843-448-1943 847-639-1469 770-436-3030 631-360-8222 PART MAX3663EVKIT Ordering Information TEMP RANGE -40C to +85C IC PACKAGE 24 QFN Note: Please indicate that you are using the MAX3663 when contacting these component suppliers. Component List for Electrical Configuration DESIGNATION C1, C2, C6, C12, C20 C4, C7, C10, C11 C5 C8 C16 QTY 5 4 1 1 1 DESCRIPTION 0.01F 10% ceramic capacitors (0402) 1F 10% ceramic capacitors (0603) Do not install 100pF 10% ceramic capacitor (0402) 0.1F 10% ceramic capacitor (0603) 10F 10%, 10V min tantalum capacitor case B AVX TAJC106K016 5pF 5% ceramic capacitor (0402) LED SMA connectors, edge mount 3-pin headers, 0.1in centers Open 1.2H inductor Coilcraft 1008LS-122XKBC PNP transistor Zetex FMMT591A 1.5k 5% resistors (0402) 1k 5% resistor (0603) Do not install DESIGNATION R5 R6, R7, R21 R8, R9 R10, R11 R12 R13, R22 R14 R15 R16 R18 R20 R23 R26, R28 U1 U2 VCC, GND, TP1-TP13 None None QTY 1 3 2 2 1 2 1 1 1 1 1 1 2 1 1 15 1 1 DESCRIPTION 12.4 1% resistor (0402) 84.5 1% resistors (0603) 124 1% resistors (0603) 20 1% resistors (0402) 10 1% resistor (0402) 0 resistors (0603) 50k variable resistor Bourns 3296W 200k variable resistor Bourns 3296W 100k variable resistor Bourns 3296W 110 5% resistor (0603) 0 resistor (0402) 15 5% resistor (0603) 392 1% resistors (0402) MAX3663 24-pin QFN MAX495ESA 8-pin SOIC Test points MAX3663 data sheet MAX3663ETG EV kit PC board, rev A C19 C21 D1 J1, J2, J3 JU1-JU4 L2 L3 Q1 R1, R2, R24 R3 R4, R17, R25, R27, R29 1 1 1 3 4 1 1 1 3 1 5 ________________________________________________________________ Maxim Integrated Products 1 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. MAX3663 Evaluation Kit Evaluates: MAX3663 Component Modifications for Optical Configuration DESIGNATION D3 J3 L2 R5 R13 R19 R20 R22 R23 QTY 1 1 1 1 1 1 1 1 1 Remove Ferrite bead Murata BLM18HG601SN1 Remove Remove 20 5% resistor (0402) 5 5% resistor (0402) Remove Remove DESCRIPTION User-supplied laser diode 8) Attach a high-speed oscilloscope with 50 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. Optical Setup 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. 2) Connect a TO-style header laser and monitor diode (Figure 1) as follows: * 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. 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. Quick Start Electrical Setup (Default) 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 10k resistance between pins 2 and 3 (test point 5 and ground). 4) Shunt JU1 to R15. Adjust R15, the BIAS (RBIASMAX) potentiometer, for 10k resistance between pins 2 and 3 (test point 4 and ground). 5) Shunt JU3 to R16. Adjust R16, the APC (RAPCSET) potentiometer, for 10k 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 _______________________________________________________________________________________ MAX3663 Evaluation Kit 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). 10) Adjust R14 until the desired optical amplitude is achieved. Optical amplitude can be observed on an oscilloscope connected to an optical/electrical converter. Evaluates: MAX3663 Adjustment and Control Descriptions See Quick Start first. COMPONENT D1 J3 JU1 JU2 JU3 JU4 R14 R15 R16 TP1 NAME APC Fail Indicator LED Electrical Output SMA RBIASMAX Selector RMODSET Selector RAPCSET Selector OUTPUT DISABLE RMODSET RBIASMAX RAPCSET Fail Indicator Test Point FUNCTION 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). Electrical Output. Remove for optical operation. Selects RBIASMAX resistor. Shunt to supplied potentiometer R15 or to fixed resistor R17. Selects RMODSET resistor. Shunt to supplied potentiometer R14 or to fixed resistor R25. Selects RAPCSET resistor. Shunt to supplied potentiometer R16 or to fixed resistor R4. Enable/Disable the Output Currents. Shunt to VCC to disable the part. Shunt to ground or leave open to enable the part. Laser Modulation Current Adjustment 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. Automatic Power-Control Adjustment. For closed-loop operation, R16 adjusts the monitor-diode current level. TTL low level indicates a failure in the APC loop. _______________________________________________________________________________________ 3 MAX3663 Evaluation Kit Evaluates: MAX3663 CONFIGURATION 1 CONFIGURATION 2 TOP OF PC BOARD TOP OF PC BOARD VCC VCC SOLDER BRIDGES TO-46 CAN LASER/PHOTODIODE PAIR BOTTOM OF PC BOARD SOLDER BRIDGES Figure 1. Attachment of Laser Diode/Monitor Diode to MAX3663 EV Kit 4 _______________________________________________________________________________________ L2 D3 L2 D3 L2 D3 VCC VCC LD TO-46 CAN LASER/PHOTODIODE PAIR LD TO-46 CAN LASER/PHOTODIODE PAIR PD BOTTOM OF PC BOARD PD BOTTOM OF PC BOARD VCC VCC SOLDER BRIDGES VCC VCC CONFIGURATION 3 CONFIGURATION 4 TOP OF PC BOARD TOP OF PC BOARD L2 VCC VCC VCC VCC LD TO-46 CAN LASER/PHOTODIODE PAIR PD BOTTOM OF PC BOARD VCC VCC SOLDER BRIDGES D3 LD PD VCC VCC R4 JU3 R25 JU2 R17 JU1 VCC MD OPEN R16 100k RAPCSET OPEN R14 50k RMODSET CW OPEN R15 200k RBIASMAX CW 24 BIASMAX MODSET APCSET CW TP4 R1 1.5k R3 1.0k C1 0.01F 19 VCC TP5 R2 1.5k TP6 C16 0.1F 23 GND CAPC 22 21 20 VCC C2 1 VCC DATA+ GND MD VCC 18 17 VCC 16 20 15 14 VCC 6 MODMON ENABLE GND FAIL N.C. GND BIAS VCC J1 0.01F 2 VCC DATAVCC DATA+ 3 4 GND BIASMON OUT+ R6 84.5 C10 C8 100pF R11 C4 1F R10 20 R12 10 U1 1F R8 124 Figure 2. MAX3663 EV Kit Schematic--Electrical Configuration R7 84.5 VCC R26 392 5 13 TP8 J2 OUT- MAX3663 DATAR9 124 R27 OPEN TP11 7 VCC TP13 TP1 JU4 C5 OPEN VCC R18 110 VCC TP7 TP12 2 1 Q1 3 C19 10F TP2 TP3 C12 0.01F C20 0.01F MD BIAS C11 1F R20 0 C7 1F R19 OPEN C21 5pF J3 OUT VCC 8 9 10 11 12 R28 392 BIAS R29 OPEN L2 OPEN VCC R5 12.4 R24 1.5k VCC TP10 D1 RED R21 84.5 4 6 VCC R13 0 2 U2 3 7 C6 0.01F R23 15 TP9 VCC L3 1.2F Evaluates: MAX3663 _______________________________________________________________________________________ R22 0 GND MAX3663 Evaluation Kit 5 Evaluates: MAX3663 JU3 R25 JU2 R17 JU1 VCC MD GND BIASMAX MODSET APCSET C2 1 VCC MD GND DATA+ VCC 18 17 VCC VCC CAPC VCC VCC MAX3663 Evaluation Kit ENABLE GND FAIL N.C. GND R28 392 7 VCC TP13 TP1 JU4 C5 OPEN VCC R18 110 VCC TP7 TP12 R29 OPEN 8 9 10 11 12 BIAS Figure 3. MAX3663 EV Kit Schematic--Optical Configuration OPEN R14 50k RMODSET CW OPEN R15 200k RBIASMAX CW 24 23 22 21 20 19 R1 1.5k R2 1.5k C1 0.01F VCC R3 1.0k TP6 TP4 TP5 C16 0.1F D3 C8 100pF R11 20 R7 84.5 VCC 5 BIASMON MODMON VCC OUT+ 6 0.01F 2 3 DATAGND R4 OPEN R16 100k RAPCSET CW J1 DATA+ R8 124 VCC 4 U1 16 15 14 VCC 6 13 R10 20 R27 OPEN TP11 C4 1F R6 84.5 C10 1F J2 TP8 OUT- MAX3663 R12 10 R20 5 C7 1F R19 20 C21 5pF DATAR9 124 C11 R26 392 1F VCC BIAS L2 VCC MURATA BLM18HG601SN1 TP10 VCC R24 1.5k R5 OPEN D1 RED R21 84.5 2 1 Q1 3 6 VCC R13 OPEN TP3 MD 4 2 U2 3 7 C6 0.01F R23 TP9 OPEN _______________________________________________________________________________________ L3 1.2H C19 10F TP2 C12 0.01F C20 0.01F R22 OPEN BIAS VCC GND MAX3663 Evaluation Kit Evaluates: MAX3663 1.0" Figure 4. MAX3663 EV Kit Component Placement Guide--Component Side _______________________________________________________________________________________ 7 MAX3663 Evaluation Kit Evaluates: MAX3663 1.0" Figure 5. MAX3663 EV Kit PC Board Layout--Component Side 1.0" Figure 6. MAX3663 EV Kit PC Board Layout--Solder Side 8 _______________________________________________________________________________________ MAX3663 Evaluation Kit Evaluates: MAX3663 1.0" Figure 7. MAX3663 EV Kit PC Board Layout--Ground Plane 1.0" 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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