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| 19-2695; Rev 0; 12/02 MAX3741 Evaluation Kit General Description The MAX3741 evaluation kit (EV kit) is an assembled demonstration board that provides complete optical and electrical evaluation of the MAX3741 compact VCSEL driver. The EV kit has an electrical test section and an optical test section. Electrically, the output of the evaluation board is interfaced to an SMA connector, which can be connected to a 50 terminated oscilloscope. Optically, the board can be configured to interface with a common-cathode VCSEL. o Fully Assembled and Tested o Single +3.3V Power-Supply Operation o Allows Optical and Electrical Evaluation Features Evaluates: MAX3741 Component Suppliers SUPPLIER AVX Coilcraft Murata Zetex PHONE 803-946-0690 847-639-6400 814-237-1431 516-543-7100 FAX 803-626-3123 847-639-1469 814-238-0490 516-864-7630 PART Ordering Information TEMP RANGE IC PACKAGE 16 Thin QFN (3mm x 3mm) MAX3741EVKIT -40C to +85C Note: When contacting these suppliers, please indicate that you are using the MAX3741. Component List DESIGNATION C1, C2, C9, C10, C12, C13, C14 C3-C7 C8, C11 GND, VCC, TP1-TP7, TP9, TP10 JU1 J1, J2, J3, J6-J9 L1 L2 L3 R1 R2, R3, R7, R8 QTY 7 5 2 DESCRIPTION 0.1F 10% ceramic capacitors (0402) 0.01F 10% ceramic capacitors (0402) 10F 10% tantalum capacitors, case B Test points 2-pin header, 0.1in center SMA connectors, tab contacts 1H inductor (805) 600 ferrite bead (0603) Murata BLM18HD102SN1B 600 ferrite bead (0603)* Murata BLM18HD102SN1B 10k potentiometer Open DESIGNATION R4 R5, R9 R6 R10 R11 R12 U1 11 1 7 1 1 1 1 4 None None None QTY 1 2 1 1 1 1 1 1 1 1 DESCRIPTION 20k potentiometer 49.9 resistors (0402) 50k potentiometer 350 resistor (0402) 120 resistor (0402) 0 resistor (0402)* MAX3741ETE Shunt MAX3741 EV board MAX3741 data sheet *Not populated, but can be installed for optical evaluation. Quick Start Electrical Evaluation To ensure proper operation in the electrical configuration, set up the evaluation board as follows: 1) To enable the outputs, connect TX_DISABLE to GND by placing a shunt on JU1. Note: When performing the following resistance checks, autoranging DMMs can forward bias the on-chip ESD protection and cause inaccurate measurements. To avoid this problem, manually set the DMM to a high range. 1 ________________________________________________________________ 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. MAX3741 Evaluation Kit Evaluates: MAX3741 2) Adjust R6, the RBIASSET potentiometer, for 1.7k resistance between TP3 (BIASSET) and ground. 3) Adjust R4, the RPEAKSET potentiometer, for 20k resistance between TP2 (PEAKSET) and ground to disable peaking. 4) Adjust R1, the RMODSET potentiometer, for 10k resistance between TP1 (MODSET) and ground. 5) Apply a differential input signal (250mV P-P to 2200mVP-P) between SMA connectors J1 and J2 (IN+ and IN-). 6) Attach a high-speed oscilloscope with a 50 input to SMA connector J3 (OUT). 7) Connect a +3.3V supply between VCC and GND. Adjust the power supply until the voltage between TP10 and ground is +3.3V. 8) Adjust R6 (RBIASSET) until the desired laser bias current is achieved. V IBIAS = TP6 120 9) The BIAS current can be monitored at TP5 (VBIASMON) using the equation below: IBIAS = 9 x VBIASMON 350 surements. To avoid this problem, manually set the DMM to a high range. 5) Adjust R6, the RBIASSET potentiometer, for 1.7k resistance between TP3 (BIASSET) and ground. 6) Adjust R4, the RPEAKSET potentiometer, for 20k resistance between TP2 (PEAKSET) and ground to disable peaking. 7) Adjust R1, the RMODSET potentiometer, for 10k resistance between TP1 (MODSET) and ground. 8) Apply a differential input signal (250mV P-P to 2200mVP-P) between SMA connectors J1 and J2 (IN+ and IN-). 9) Attach the laser-diode fiber connector to an optical/electrical converter. 10) Connect a +3.3V supply between VCC and GND. Adjust the power supply until the voltage between TP10 and ground is +3.3V. 11) Adjust R6 (RBIASSET) until desired average optical power is achieved. 12) The BIAS current can be monitored at TP5 (VBIASMON) using the equation below: IBIAS = 9 x VBIASMON 350 10) Adjust R1 (RMODSET) until the desired laser modulation current is achieved. IMOD = Signal Amplitude (V) 50 13) Adjust R1 (RMODSET) until the desired optical amplitude is achieved. Optical amplitude can be observed on an oscilloscope connected to an optical/electrical converter. 14) Adjust R14 (RPEAKSET) until the desired amount of peaking is achieved. 11) Adjust R14 (RPEAKSET) until the desired amount of peaking is achieved. Adjustment and Control Descriptions (see Quick Start) COMPONENT JU1 NAME FUNCTION Enables/disables the output TX_DISABLE currents, install a shunt to enable output currents RMODSET RPEAKSET RBIASSET BIASMON Adjusts the laser modulation current Adjusts the peaking for the falling edge of the VCSEL Adjusts the VCSEL bias current Monitors the bias current Optical Evaluation For optical evaluation of the MAX3741, configure the evaluation kit as follows: 1) Remove component R11. 2) Install a 0 resistor at R12 and install a 600 ferrite bead at L3 (Murata BLM18HD102SN1). 3) To enable the outputs, connect TX_DISABLE to GND by placing a shunt on JU1. 4) Connect a common-cathode VCSEL as shown in Figure 1. Keep the leads short to reduce reflection. Note: When performing the following resistance checks, autoranging DMMs can forward bias the on-chip ESD protection and cause inaccurate mea2 R1 R4 R6 TP5 _______________________________________________________________________________________ TP3 TP7 VCC1 R6 50k L1 1H L2 BLM18HD102SN1B TP6 L3 OPEN TP10 VCC C9 0.1F C10 0.1F C12 0.1F C11 10F R11 120 R7 OPEN TP5 VCC VCC1 JU1 TX_DISABLE 16 15 14 13 R9 49.9 TP4 R8 OPEN 12 11 10 9 VCC1 R5 49.9 C6 0.01F J3 OUT C5 0.01F R12 OPEN TP9 2 4 C8 10F GND VCC 1 TX_DISABLE BIASMON OUT+ U1 MAX3741 OUTVCC GND IN+ INNC VCC MODSET PEAKSET J1 IN+ J2 IN4 C2 0.1F 3 C1 0.1F 2 VCC1 C13 0.1F J6 CALOUT+ 5 6 7 BIASSET 8 BIAS Figure 1. MAX3741 EV Kit Schematic C7 0.01F R10 350 C4 0.01F 1 3 D1 VCSEL PHOTODIODE GND J7 CALIN+ C3 0.01F C14 0.1F J8 CALOUT- J9 CALIN- R1 10k R4 20k R2 OPEN R3 OPEN Evaluates: MAX3741 _______________________________________________________________________________________ TP1 TP2 MAX3741 Evaluation Kit 3 MAX3741 Evaluation Kit Evaluates: MAX3741 1.0" 1.0" Figure 2. MAX3741 EV Kit Component Placement Guide-- Component Side Figure 3. MAX3741 EV Kit PC Board Layout--Component Side 4 _______________________________________________________________________________________ MAX3741 Evaluation Kit Evaluates: MAX3741 1.0" 1.0" Figure 4. MAX3741 EV Kit PC Board Layout--Ground Plane Figure 5. MAX3741 EV Kit PC Board Layout--Power Plane _______________________________________________________________________________________ 5 MAX3741 Evaluation Kit Evaluates: MAX3741 1.0" Figure 6. MAX3741 EV Kit PC Board Layout--Solder Side 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. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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