19-1311; Rev 1; 3/98 MAX3667 Evaluation Kit ____________________________Features ♦ Fully Assembled and Tested ♦ Board is Configured for 3.3V Operation ♦ PECL Input Termination Provided On-Board _______________Ordering Information PART TEMP. RANGE IC PACKAGE MAX3667EVKIT -40°C to +85°C 32 TQFP ♦ Independent Electrical Monitoring of Modulation and Bias Currents _______________________________________________________________________Component List DESIGNATION QTY DESIGNATION QTY DESCRIPTION C1, C2, C4, C5, C7–C10, C12, C13, C15, C16, C17, C19 14 C3 1 1000pF ±10%, 25V min ceramic capacitor 2 1µF ±10%, 25V min ceramic capacitors C11 1 0.01µF ±10%, 25V min ceramic capacitor C18, C20 2 100µF ±10%, 16V tantalum capacitors Digi-Key P5231-ND or Panasonic ECE-A1CGE101 R1, R2 2 130Ω ±1% resistors R3, R5, R13 3 50kΩ Bournes variable resistors Digi-Key 3296W-503-ND C6, C14 0.1µF ±10%, 25V min ceramic capacitors DESCRIPTION R17, R18 2 49.9Ω ±1% resistors R19 1 232Ω ±1% resistor R21 1 22.1Ω ±1% resistor SJ1, SJ2, SJ4 3 Trace gap jumpers. Short with solder. SJ5 1 Trace gap jumper. Leave open. L1 1 470nH inductor Coilcraft 1008CS-471XKBC J1–J4 4 SMA connectors (edge mount) E.F. Johnson 142-0701-801 Digi-Key J502-ND JU1, JU3 2 3-pin headers (0.1" centers) Digi-Key S1012-36-ND JU10 1 2-pin header (0.1" center) Digi-Key S1012-36-ND VCC, GND 2 1-pin headers Mouser test point 151-203 JU1, JU3, JU10 3 Shunts Digi-Key S9000-ND R4, R6 2 1.5kΩ ±5% resistors R7, R20 2 100Ω ±1% resistors R8, R9 2 82.5Ω ±1% resistors U1 1 MAX3667ECJ (32-pin TQFP) 1 MAX3667 circuit board 1 MAX3667 data sheet R11 1 4.75Ω ±1% resistor None R12 1 20kΩ ±5% resistor None R15 1 2kΩ ±5% resistor ______________Component Suppliers SUPPLIER PHONE FAX AVX (806) 946-0690 (800) 282-4975 (803) 626-3123 Central Semiconductor (516) 435-1110 (516) 435-1824 Murata (814) 237-1431 (800) 831-9172 (814) 238-0490 Zetex (516) 543-7100 (516) 864-7630 _________________________Quick Start 1) Ensure that solder bridges SJ1, SJ2, and SJ4 are shorted. 2) Ensure that solder bridge SJ5 is open. 3) Install shunt JU3 between pins 1 and 2. 4) Install shunt JU1 between pins 2 and 3. 5) Open JU10. 6) Turn the R13 (APCSET) potentiometer counterclockwise to 50kΩ (maximum turn). ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. Evaluates: MAX3667 ________________General Description The MAX3667 evaluation kit (EV kit) is an assembled, surface-mount demonstration board that provides easy optical evaluation of the MAX3667. Evaluates: MAX3667 MAX3667 Evaluation Kit 7) Turn the R3 (MODSET) potentiometer counterclockwise to 50kΩ (maximum turn). 8) Attach a high-impedance voltmeter to J3 (BIASMON). 9) Attach a high-impedance oscilloscope to J4 (MODMON). 10) Apply a PECL-compatible differential input signal across J1 to J2. 11) Connect a TO46-style header laser diode and monitor (Figure 1). 12) Attach the laser diode output to an optical/electrical converter. 14) Adjust APCSET (R13) clockwise until the desired laser bias is achieved. Bias can be monitored at J3 (BIASMON). The conversion factor is (VBIASMON / 50) x 38 (typical) = IBIAS. Power can also be monitored at the laser diode with an optical/electrical converter. 15) Adjust MODSET (R3) clockwise until the desired modulation current is achieved. Modulation can be monitored at J4 (MODMON). The conversion factor is (VMODMON / 50) x 33 (typical) = IMOD. Modulation can also be observed on an oscilloscope connected to an optical/electrical converter. 13) Power the board up with a +3.3V power source at the 3.3V pin and GND pin. Set the current limit to 300mA. _______________Adjustment and Control Descriptions (see Quick Start first) 2 COMPONENT NAME FUNCTION R5 BIASSET In open-loop operation (APC not used) this potentiometer adjusts the bias current applied to the laser. Note that R6 limits the maximum bias current. R13 APCSET In closed-loop operation (APC engaged) this potentiometer adjusts the bias current applied to the laser. Note that R15 limits the maximum bias current. R3 MODSET This potentiometer adjusts the modulation current applied to the laser. Note that R4 limits the maximum modulation current. JU1 DISABLE Shunting between pins 1 and 2 (high) disables the part. Shunting pins 2 and 3 enables the part. JU3 APC JU10 — J3 BIASMON Monitors the bias current at the laser. BIASMON is typically 1/38 of the actual laser bias current. When SJ1 is closed and using a high-impedance meter, current at BIASMON = VBIASMON / 49.9Ω. J4 MODMON Monitors the modulation current at the laser. If using a high-impedance scope, ensure that SJ2 is closed. IMODMON = (voltage on oscilloscope) / 49.9Ω. IMODMON is typically 1/33 of the actual laser modulation current (IQMOD). If using a 50Ω terminated scope, ensure that SJ2 is open. Conversion factor is the same as above. SJ1 50Ω termination See BIASMON (J3). SJ2 50Ω termination See MODMON (J4). SJ4 — When using APC, this solder jumper should be shorted. When APC is not being used, ensure that the solder jumper is open. SJ5 — When using APC, this solder jumper should be open. When APC is not being used, ensure that the solder jumper is shorted. In closed-loop operation (APC engaged) pins 1 and 2 must be shunted. In open-loop operation pins 2 and 3 must be shunted. Open when in closed-loop mode. Shunted when in open-loop mode. _______________________________________________________________________________________ MAX3667 Evaluation Kit Evaluates: MAX3667 SMA CONNECTORS VIEW FROM TOP FOUR SOLDER WIRE CONTACTS: 2 TOP (LASER) AND 2 BOTTOM (MONITOR) VCC LASER DIODE/MONITOR ASSEMBLY LASER ANODE CONNECTION ER AL FIB OPTIC VIEW FROM BOTTOM VCC MONITOR CATHODE CONNECTION Figure 1. Attachment of Laser Diode/Monitor to MAX3667 EV Kit _______________________________________________________________________________________ 3 VFORCE APCSET 2 R18 49.9Ω R17 49.9Ω 1 SJ2 R15 2k SJ5 J4 SMA J3 SMA BIASMON JU10 MODMON SJ1 3 C16 0.1µF R13 SJ4 C14 1µF R12 20k SMA J1 +3.3V SMA Figure 2. MAX3667 EV Kit Schematic _______________________________________________________________________________________ J2 32 31 30 29 28 27 26 25 C13 0.1µF R1 130Ω R8 82Ω +3.3V +3.3V C15 0.1µF +3.3V C9 0.1µF C2 0.1µF C11 0.01µF R2 130Ω R9 82Ω C10 0.1µF C1 0.1µF 2 1 COMP N.C. MODMON BIASMON N.C. APCSET N.C. MD 3 MAX3667 U1 5 C12 0.1µF 4 APC BIASSET GND GND GND IBIAS 2 3 +3.3V 8 DISABLE 7 N.C. MODSET JU1 1 6 18 17 C6 1µF R21 22Ω PULLUP 24 23 22 21 20 19 VCC VCC IMOD IN+ VCC VCC GND IN- +3.3V GND GND IMOD GND GND DISABLE 4 GND 9 10 11 12 13 14 15 16 GND +3.3V 1 R3 2 C17 0.1µF MODSET R7 100Ω L1 470nH +3.3V R4 1.5k C5 0.1µF R11 4.7Ω C18 100µF 3 R6 1.5k +3.3V 1 2 3 JU3 3 R20 100Ω C19 0.1µF C4 0.1µF BIASSET LASER C3 1nF APC R19 232Ω 1 2 R5 C7 0.1µF C20 100µF VFORCE VFORCE MONITOR C8 0.1µF Evaluates: MAX3667 MAX3667 Evaluation Kit MAX3667 Evaluation Kit Evaluates: MAX3667 1.0" 1.0" Figure 3. MAX3667 EV Kit Component Placement Guide Figure 4. MAX3667 PC Board Layout—Top Solder Mask _______________________________________________________________________________________ 5 Evaluates: MAX3667 MAX3667 Evaluation Kit 1.0" 1.0" Figure 5. MAX3667 PC Board Layout—Solder Side Figure 6. MAX3667 PC Board Layout—GND Plane 1.0" Figure 7. MAX3667 PC Board Layout—Power Plane 6 _______________________________________________________________________________________ MAX3667 Evaluation Kit Evaluates: MAX3667 1.0" 1.0" Figure 8. MAX3667 PC Board Layout—Component Side Figure 9. MAX3667 PC Board Layout—Bottom Solder Mask _______________________________________________________________________________________ 7 Evaluates: MAX3667 MAX3667 Evaluation Kit NOTES 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 © 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.