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| 19-1442; Rev 1; 4/99 MAX3668 Evaluation Kit General Description The MAX3668 evaluation kit (EV kit) is an assembled, surface-mount demonstration board that provides easy optical or electrical evaluation of the MAX3668. Although the MAX3668 evaluation kit is shipped in the electrical configuration, this data sheet also provides configuration instructions for optical operation. o Fully Assembled and Tested o +3.3V to +5.0V Operation o Input Termination Provided On-Board o Independent Electrical Monitoring of Modulation and Bias Currents Features Evaluates: MAX3668 Component Suppliers SUPPLIER AVX Coilcraft Murata PHONE 803-946-0690 847-639-6400 814-237-1431 FAX 803-626-3123 847-639-1469 814-238-0490 PART MAX3668EVKIT TEMP. RANGE -40C to +85C IC PACKAGE 32 TQFP Ordering Information Zetex 516-543-7100 516-864-7630 Note: Please indicate that you are using the MAX3668 when contacting these component suppliers. Component List for Electrical Configuration DESIGNATION C1, C17 C2, C6, C20 C3 C4, C7, C10, C11 C8 C16 QTY 2 3 1 4 1 1 DESCRIPTION 0.01F, 10% ceramic capacitors (0402) 0.01F, 10% ceramic capacitors (0603) 0.1F, 10%, 25V min ceramic capacitor (0603) 1F ceramic capacitors (0805) 100pF, 10% ceramic capacitor (0402) 0.1F, 10%, 25V min ceramic capacitor (0805) 10F, 10%, 16V min tantalum capacitor AVX TAJC106K016 5pF, 10% ceramic capacitor (0402) LED SMA connectors (edge mount) 3.3H inductor Coilcraft 1008CS-332XKBC 2-pin header (0.1" center) Shunt PNP transistor Zetex FMMT591 1k 5% resistors (0603) 12.3 1% resistor (0402) 84.5 1% resistors (0603) 124 1% resistors (0603) 20 1% resistors (0603) DESIGNATION R12 R13, R20, R22, R25 R14, R15, R16 R18 R21 R23 R24 VCC, GND, TP1, TP4, TP5, TP6, TP9, TP10 U1 U3 QTY 1 4 3 1 1 1 1 8 1 1 DESCRIPTION 10 1% resistor (0402) 0 resistors (0603) 50k variable resistors 110 5% resistor (0603) 10 5% resistor (0603) 15 5% resistor (0805) 1.5k 5% resistor (0603) Test points MAX3668EHJ (32 TQFP) MAX495CSA (8-pin SO) C19 C21 CR1 J1, J2, J5 L3 P1 P1 Q1 R1, R2, R3 R5 R6, R7 R8, R9 R10, R11 1 1 1 3 1 1 1 1 3 1 2 2 2 Component Modifications for Optical Configuration DESIGNATION QTY J5 L2 R5 R13 R19 R20 R22 R23 U2 1 1 1 1 1 1 1 1 1 Remove Ferrite bead Murata BLM11HA601SG Remove Remove 20 5% resistor (0402) 5 5% resistor (0402) Remove Remove User-supplied laser diode 1 DESCRIPTION ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MAX3668 Evaluation Kit Evaluates: MAX3668 Quick Start Electrical Setup (Default) In the electrical configuration, an Automatic Power Control (APC) test circuit is included to emulate a semiconductor laser with a monitor photodiode. Monitordiode current is provided by Q1, which is controlled by an operational amplifier (U3). The APC test circuit, consisting of U3 and Q1, applies the simulated monitordiode current (the ratio IBIAS / IMD is R24 / R23 = 100) to the MD pin of the MAX3668. To ensure proper operation in the electrical configuration, set up the evaluation board as follows: 1) Verify inductor L2 is not installed. 2) Remove the shunt from P1 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) Adjust R14, the MOD potentiometer, for 10k resistance between pins 2 and 3 (test point 5 and ground). 4) Adjust R15, the BIAS potentiometer, for 10k resistance between pins 2 and 3 (test point 4 and ground). 5) Adjust R16, the APC 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-). 8) Attach a high-speed oscilloscope with 50 inputs to J5. 9) Adjust R BIAS (R15) and R APC (R16) until the desired laser-bias current is achieved (see note in the Applications section of the MAX3668 data sheet). 10) Adjust RMOD (R14) until the desired laser-modulation current is achieved. Optical Setup For optical operation, the electrical APC test circuit must be disabled. For optical evaluation of the MAX3668, configure the EV kit as described in Component Modifications for Optical Configuration. 1) Remove the shunt from P1 to enable the output. 2) Connect a TO-style header laser and monitor diodes (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 C17 (VCC) with the cathode connected to R20 and the anode connected to VCC. Adjustment and Control Descriptions (see Quick Start first) COMPONENT P1 J5 R14 R15 R16 TP1 CR1 NAME OUTPUT DISABLE Electrical Output SMA MOD BIAS APC Fail Indicator Fail Indicator FUNCTION Enable/Disable the Output Currents. Shunting disables the part. Remove shunt for normal operation. Electrical Output. Remove for optical operation. Laser Modulation Current Adjustment Laser Bias Current Adjustment. In open-loop mode, R15 adjusts the laserbias 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. Refer to the Design section of the MAX3668 data sheet. Set APC current; then increase bias current until LED goes off (LED is illuminated when the APC loop is open and off when the APC loop is closed). 2 _______________________________________________________________________________________ MAX3668 Evaluation Kit * Connect the monitor diode on the underside of the board with the anode connected to the MD pin of the MAX3668 (underneath the laser-diode cathode) and the cathode connected to VCC (underneath the laser-diode anode). Note: When performing resistance checks, manually set the ohmmeter to a high range to avoid forward biasing the on-chip ESD protection diodes. 4) Adjust R14, the MOD potentiometer, for maximum resistance between pins 2 and 3 (test point 5 and ground). 5) Adjust R15, the BIAS potentiometer, for maximum resistance between pins 2 and 3 (test point 4 and ground). 6) Adjust R16, the APC potentiometer, for desired optical power. (Refer to the Design Procedure section of the MAX3668 data sheet.) 7) Power-up the board with a +3.3V supply. 8) Apply a differential input signal (800mV per side) to J1 and J2 (DATA+ and DATA-). 9) Attach the laser diode output to an optical/electrical converter. 10) Adjust R15 until the LED, CR1, is no longer illuminated. Laser power can be monitored at the laser diode with an optical/electrical converter (see note in the Applications Information section of the MAX3668 data sheet). Evaluates: MAX3668 Figure 1. Attachment of Laser Diode/Monitor Diode to MAX3668 EV Kit 11) Adjust R14 until the desired optical amplitude is achieved. Optical amplitude can be observed on an oscilloscope connected to an optical/electrical converter. _______________________________________________________________________________________ 3 MAX3668 Evaluation Kit Evaluates: MAX3668 Figure 2. Expanded View of Component Placement 4 _______________________________________________________________________________________ R17 TP6 1 3 TP5 C15 R4 TP4 R3 1k R1 1k 32 31 30 29 28 27 26 25 R2 1k C16 0.1F 2 CW 2 CW 1 3 1 3 R15 50k R14 50k CW R16 50k 2 N.C. N.C. CAPC VCC 1 VCC VCC MD 23 22 21 DATAGND C8 100pF VCC VCC DATA+ 24 2 3 J1 VCC C10 R6 84.5 1F BIASMAX MODSET APCSET C2 0.01F GND N.C. C1 0.01F C9 R8 124 U1 GND 4 MAX3668 VCC GND VCC OUTOUT+ VCC VCC 17 18 19 VCC GND GND ENABLE 6 C3 0.1F 7 8 R9 124 5 20 R11 20 C4 1F GND FAIL N.C. N.C. GND VCC L3 9 10 11 12 13 14 15 16 VCC C19 10F C20 0.01F C18 VCC 3.3H GND P1 C5 BIAS L2 VCC R25 0 TP1 CR1 LED TP10 R23 15 2 3 TP9 VCC BIAS Figure 3. MAX3668 EV Kit Schematic--Electrical Configuration R12 10 U2 VCC R10 20 C7 1F R19 R20 0 5pF C21 PHOTOLASER J5 C17 0.01F VCC R5 12.3 4 5 U3 J2 C11 R7 84.5 1F R21 10 R24 1.5k R18 110 Q1 FMMT591 MAX495 7 C6 0.01F R22 0 VCC Evaluates: MAX3668 _______________________________________________________________________________________ BIAS R13 0 MD MAX3668 Evaluation Kit 5 Evaluates: MAX3668 R17 R16 50k 2 CW TP5 2 CW R4 TP4 2 CW R1 1k 32 31 30 29 28 27 26 25 R2 1k C16 0.1F R3 1k C15 1 3 R15 50k R14 50k TP6 1 3 N.C. N.C. GND N.C. VCC 1 VCC VCC MD 23 22 21 DATAGND VCC C8 100pF VCC DATA+ 24 2 3 J1 VCC C10 R6 84.5 1F BIASMAX MODSET APCSET C2 0.01F C1 0.01F C9 R8 124 U1 GND 4 MAX3668 VCC GND VCC OUTOUT+ VCC 17 18 C7 1F R10 20 VCC 19 VCC GND GND ENABLE 6 C3 0.1F 7 8 5 20 R11 20 C4 1F R12 10 R20 5 U2 VCC MAX3668 Evaluation Kit GND FAIL N.C. N.C. GND VCC L3 9 10 11 12 13 14 15 16 VCC C19 10F C20 0.01F C18 R21 10 BIAS Figure 4. MAX3668 EV Kit Schematic--Optical Configuration 1 3 CAPC R19 20 5pF C21 PHOTOLASER C17 0.01F J5 P1 C5 L2 BIAS FERRITE BEAD VCC TP10 R25 0 CR1 4 5 U3 2 3 TP9 VCC C6 0.01F R22 Q1 FMMT591 MAX495 7 VCC R13 BIAS MD LED 6 R5 TP1 R23 R15 110 J2 C11 1F R7 84.5 R9 124 VCC 3.3H GND VCC _______________________________________________________________________________________ R24 1.5k MAX3668 Evaluation Kit Evaluates: MAX3668 1.0" 1.0" Figure 5. MAX3668 EV Kit Component Placement Guide-- Component Side Figure 6. MAX3668 EV Kit PC Board Layout--Component Side 1.0" 1.0" Figure 7. MAX3668 EV Kit PC Board Layout--Solder Side Figure 8. MAX3668 EV Kit PC Board Layout--Ground Plane _______________________________________________________________________________________ 7 MAX3668 Evaluation Kit Evaluates: MAX3668 1.0" Figure 9. MAX3668 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. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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