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| 19-2567; Rev 0, 08/02 MAX3735 Evaluation Kit _______________ General Description The MAX3735 evaluation kit (EV kit) is an assembled demonstration board that provides complete optical and electrical evaluation of the MAX3735. The EV kit is composed of two independent sections, one optical and one electrical, on the PC board. The output of the electrical evaluation section is interfaced to an SMP connector that can be connected to a 50 terminated oscilloscope. The output of the optical evaluation section is configured for attachment to a laser/monitor diode. _________________________ Features Fully Assembled and Tested Single +3.3V Power Supply Operation AC-Coupling Provided On-Board Allows Optical and Electrical Evaluation Evaluates: MAX3735 _______________Ordering Information PART MAX3735EVKIT TEMP RANGE -40C to +85C IC-PACKAGE 24 QFN* *Exposed pad. ________________________________________Electrical Evaluation Component List DESIGNATION C1, C10, C11, C13, C14 C2, C12, C19, C20 C3 C4, C5, C16, C17, C18 C7, C8, C9 C15 C21 D1 D2 J1 J2, J3 JU1, JU5, JU6, JU7, JU9, JU10, JU13, JU14 JU8, JU15 JU11 JU25 L1, L5 QTY 5 -- 1 5 3 1 1 1 1 1 2 8 -- -- -- -- DESCRIPTION 0.01F 10% ceramic capacitors (0402) Open 0.5pF 10% ceramic capacitor (0201) 0.1F 10% ceramic capacitors (0402) 470pF 10% ceramic capacitors (0402) 0.01F 10% ceramic capacitor (0201) 10F 10% tantalum capacitor, case B Diode, DIO-S1A LED, red T1 package SMP connector SMA connectors, tab contact 2-pin headers, 0.1in centers Open Open Open, 0201 solder bridge Open DESIGNATION Q1 Q2 Q3 Q4 R1, R34-R40 R2 R3, R4, R5 R6 R7 R8 R9 R10 R11 R13 R14-R17 R41 U1 U2 VCC, GND, TP1- TP11, TP22 QTY 1 -- 1 1 -- 1 3 1 1 1 1 1 1 1 4 1 1 1 14 8 1 1 DESCRIPTION MOSFET (SOT23) Fairchild FDN306P Open NPN transistor (SOT23) Zetex FMMT491A PNP transistor (SOT23) Zetex FMMT591A Open 5.1 1% resistor (0402) 30 1% resistors (0402) 75 1% resistor (0402) 200 1% resistor (0402) 392 1% resistor (0402) 511 1% resistor (0402) 1.5k 1% resistor (0402) 4.3k 1% resistor (0402) 0 resistor (0603) 50k variable resistors 0 resistor (0201) MAX3735ETG (24 QFN) MAX495ESA (8 SO) Test points Shunts MAX3735 EV board MAX3735 data sheet None None None __________________________________________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. MAX3735 Evaluation Kit Evaluates: MAX3735 _________________________________________Optical Evaluation Component List DESIGNATION C22, C23, C38, C39 C24 C25, C26, C27 C28-C35 C36, C37 C40 C41 D3 D4, D5, D6 J4, J5 J6 JU16-JU20 JU21, JU22 L3 L4 QTY 4 1 3 8 2 -- 1 -- 3 2 -- 5 2 1 1 DESCRIPTION 0.1F 10% ceramic capacitors (0402) 8.2pF 10% ceramic capacitor (0402)* 470pF 10% ceramic capacitors (0402) 0.01F 10% ceramic capacitors (0402) 0.01F 10% ceramic capacitors (0603) Open 10F 10% tantalum capacitor, case B Open, user-supplied laser diode LED, red T1 Package SMA connectors, tab contact Open** 2-pin headers, 0.1in centers 3-pin headers, 0.1in centers 600 ferrite bead (0603) Murata BLM18HG601SN1 1H inductor (1008CS) Coilcraft 1008CS-102XKBC DESIGNATION Q5 Q6 R18 R19 R20 R21 R22 R23 R24 R25 R26, R27 R28, R29 R30-R33 U3 U4 VCC, GND, TP12-TP21 None None None QTY 1 1 -- 1 1 1 1 1 1 1 2 2 4 -- 1 12 7 1 1 DESCRIPTION MOSFET (SOT23) Fairchild FDN306P NPN transistor (SOT23) Zetex FMMT491A Open (0402) 11 1% resistor (0402) 15 1% resistor (0402) 49.9 1% resistor (0402)* 200 1% resistor (0402) 511 1% resistor (0402) 1.5k 1% resistor (0402) 4.3k 1% resistor (0402) 4.7k 1% resistors (0402) 330 1% resistors (0603) 50k variable resistors Open** MAX3735ETG (24 QFN) Test points Shunts MAX3735 EV board MAX3735 data sheet *These components are part of the compensation network, which can reduce overshoot and ringing. Parasitic series inductance introduces a zero into the laser's frequency response. R21 and C24 add a pole to cancel this zero. Starting values for most coaxial lasers is R21 = 49.9 in series with C24 = 8.2pF. These values should be experimentally adjusted until the output waveform is optimized. **These components are not supplied on the EV kit but can be populated if the customer wants to use the MAX3735 laser driver with the DS1858 dual temperature controlled digital resistor with current monitors. See schematics on page 8 for details. ______________ 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 Note: Please indicate that you are using the MAX3735 when contacting these component suppliers. 2 _________________________________________________________________________________________ MAX3735 Evaluation Kit __________________________Quick Start Electrical Evaluation In the electrical configuration, an automatic power control (APC) test circuit is included to emulate a semiconductor laser with a monitor photodiode. Monitor diode current is provided by transistor Q4, which is controlled by an operational amplifier (U2). The APC test circuit consisting of U2 and Q4 applies the simulated monitor diode current (the laser bias current divided by a factor of 77) to the MD pin of the MAX3735. To ensure proper operation in the electrical configuration, set up the evaluation board as follows: 1) 2) 3) 4) Place shunts on JU5, JU6, JU7, JU10 and JU14 (Refer to table 1 for details). If the EV kit is to be used without the optional shutdown transistor (Q1), place a shunt on JU13. Remove the shunt from JU1 to use the filter inductor. To enable the outputs, connect TX_DISABLE to GND by placing a shunt on JU9. 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. 5) 6) 7) Adjust R15, the RMODSET potentiometer, for 25k resistance between TP6 and ground. Adjust R16, the RAPCSET potentiometer, for 25k resistance between TP4 and ground. Adjust R17, the RPC_MON potentiometer, to set the maximum monitor diode current (IMDMAX, see below). RPC_MON can be measured from TP10 to ground. Note: J1 has a DC voltage of approximately VCC/2 and can have voltage swings greater than 1V. Care should be taken that the large swing and DC voltage do not damage the test equipment. An attenuator might be needed to make the signal compatible with the oscilloscope's input requirements. 11) Connect a +3.3V supply between TP2 (VCC) and TP1 (GND) Adjust the power supply until the voltage between TP7 and ground is +3.3V. 12) Adjust R16 (RAPCSET) until the desired laser bias current is achieved. Evaluates: MAX3735 I BIAS = VTP3 - VTP5 5.11 13) The MD and BIAS currents can be monitored at TP10 (VPC_MON) and TP11 (VBC_MON) using the equation below: I MD = I BIAS = VPC_MON R PC_MON R BC_MON 76 x VBC_MON Note: If the voltage at TP10 or TP 11 exceeds 1.38V, the TX_FAULT signal will be asserted and latched. 14) Adjust R15 until the desired laser modulation current is achieved. I MOD = Signal Amplitude (V) 15 Optical Evaluation R PC_MON = 8) 1.38V I MDMAX Adjust R14, the RBC_MON potentiometer, to set the maximum bias current (IBIASMAX, see below). RBC_MON can be measured from TP11 to ground. For optical evaluation of the MAX3735, configure the evaluation kit as follows: 1) Place a shunt on JU18 to connect the FAULT indicator and remove shunt JU20 to use the filter inductor. Place a shunt across pin 2 (MODSET) and pin 1 (RMODSET) of JU21. This connects the MODSET pin to the RMODSET potentiometer (R31). Place a shunt across pin 2 (APCSET) and pin 3 (RAPCSET) of JU22. This connects the APCSET pin to the RAPCSET potentiometer (R30). If the EV kit is to be used without the optional shutdown transistor (Q5), place a shunt on JU17. R BC_MON = 9) 76 x 1.38V I BIASMAX 2) Apply a differential input signal (200mVP-P to 2400mVP-P) between SMA connectors J2 and J3 (IN+ and IN-). 3) 10) Attach a high-speed oscilloscope with a 50 input to the SMP connector J1 (OUT+). 4) ________________________________________________________ 3 MAX3735 Evaluation Kit 5) Evaluates: MAX3735 To enable the outputs, connect TX_DISABLE to GND by placing a shunt on JU16. The EV kit is designed to allow connection of a variety of possible laser/monitor diode pin configurations. Connect a TO-header style laser with monitor diode (Figure 1) as follows: * Keeping its leads as short as possible, connect the laser diode to two of the three pads in the cutout portion on the top (component) side of the PC board. Solder the laser diode cathode to the center pad, and solder the anode to either of the other two pads (they are both connected to VCC through the shutdown transistor (Q5)). Connect the monitor photodiode to two of the five pads on the bottom (solder) side of the PC board, directly below the laser diode pads. Connect the anode and cathode of the photodiode as shown in figure 1. R PC_MON = 6) 1.38V I MDMAX 10) Adjust R32, the RBC_MON potentiometer, to set the maximum bias current (IBIASMAX, see below). R BC_MON = 76 x 1.38V I BIASMAX 11) Apply a differential input signal (200mVP-P to 2400mVP-P) between SMA connectors J5 and J4 (IN+ and IN-). 12) Attach the laser diode fiber connector to an optical/electrical converter. 13) Connect a +3.3V supply between TP12 (VCC) and TP13 (GND). Adjust the power supply until the voltage between TP15 and ground is +3.3V. 14) Adjust R30 (RAPCSET) until the desired average optical power is achieved. 15) The MD and BIAS currents can be monitored at TP16 (VPC_MON) and TP18 (VBC_MON) using the equations below: * 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. 7) Adjust R31, the RMODSET potentiometer, for maximum resistance (50k) between TP17 and ground. This sets the modulation current to a low value (<10mA). (Refer to the Design Procedure section of the MAX3735 data sheet.) Adjust R30, the RAPCSET potentiometer, for maximum resistance (50k) between TP19 and ground. This sets the photodiode current to a low value (<18uA). (Refer to the Design Procedure section of the MAX3735 data sheet.) WARNING: Consult your laser data sheet to ensure that 18A of photodiode current and 10mA of modulation current does not correspond to excessive laser power. 9) Adjust R33, the RPC_MON potentiometer, to set the maximum monitor diode current (IMDMAX, see below). I MD = I BIAS = VPC_MON R PC_MON R BC_MON 8) 76 x VBC_MON Note: If the voltage at TP16 or TP18 exceeds 1.38V, the TX_FAULT signal will be asserted and latched. 16) Adjust R31 (RMODSET) until the desired optical amplitude is achieved. Optical amplitude can be observed on an oscilloscope connected to an optical/electrical converter. Laser overshoot and ringing can be improved by appropriate selection of R21 and C24, as described in the Design Procedure section of the MAX3735 data sheet. 4 _________________________________________________________________________________________ MAX3735 Evaluation Kit ______________ Adjustment and Control Descriptions (see Quick Start first) Evaluates: MAX3735 COMPONENT OPTICAL D6 ELECTRICAL D2 NAME Fault Indicator FUNCTION LED is illuminated when a fault condition has occurred (Refer to the Detailed Description section of the MAX3735 data sheet). Connects the APCSET pin to either the potentiometer or the Dallas digital resistor. Shunt pin 2 to pin 3 when using the potentiometer. Shunt pin 2 to pin 1 when using the Dallas DS1858 controller IC. Connects the MODSET pin to either the potentiometer or the Dallas digital resistor. Place a shunt on pin 2 to pin 1 when using the potentiometer. Place a shunt on pin 2 to pin 3 when using the Dallas DS1858 controller IC. Can be used to enable and disable the write protection feature of the DS1858 controller IC. Placing a shunt on JU1 or JU20 removes the inductor from the filter networks by shorting the inductor lead together. Remove shunts for normal operation. Place a shunt on JU18 or JU5 to connect the open collector FAULT output to the LED indicator. The LED is illuminated when FAULT is asserted. Placing a shunt on JU6 connects the MODSET pin of the MAX3735 to the RMODSET potentiometer. Placing a shunt on JU7 connects the emulated monitor diode current to the MD pin of the MAX3735. Enables/disables the output currents. Active low (shunt across JU9 or JU16 to enable output currents). Placing a shunt on JU10 connects the APCSET pin of the MAX3735 to the RAPCSET potentiometer. Installing a jumper on JU13 or JU17 disables the optional shutdown transistors. Adjusts the laser modulation current Adjusts the monitor diode current level to be maintained by the APC loop TTL high level indicates a fault condition. Installing and then removing JU16 for the optical section or JU9 for the electrical section will clear the fault condition (Refer to the Detailed Description section of the MAX3735 data sheet). JU22 -- -- JU21 -- -- JU19 JU20 -- JU1 WP -- JU18 -- -- JU16 -- JU17 R31 R30 JU5 JU6 JU7 JU9 JU10 JU13 R15 R16 -- -- -- TX_DISABLE -- -- RMODSET RAPCSET TP14 TP8 Fault ________________________________________________________ 5 MAX3735 Evaluation Kit Evaluates: MAX3735 CONFIGURATION 1 TOP OF PC BOARD R19 VCC VCC VCC CONFIGURATION 2 TOP OF PC BOARD R19 VCC LD T0-46 CAN LASER/PHOTODIODE PAIR LD T0-46 CAN LASER/PHOTODIODE PAIR PD PD SOLDER BRIDGES VCC VCC TO MD SOLDER BRIDGES VCC VCC TO MD BOTTOM OF PC BOARD BOTTOM OF PC BOARD CONFIGURATION 3 TOP OF PC BOARD R19 VCC VCC CONFIGURATION 4 TOP OF PC BOARD R19 VCC VCC LD T0-46 CAN LASER/PHOTODIODE PAIR LD T0-46 CAN LASER/PHOTODIODE PAIR PD PD SOLDER BRIDGES VCC VCC TO MD SOLDER BRIDGES VCC VCC TO MD BOTTOM OF PC BOARD BOTTOM OF PC BOARD Figure 1. Attachment of Laser Diode/Monitor Diode to the MAX3735 EV Kit 6 _________________________________________________________________________________________ JU1 R1 OPEN TP7 JU14 RAPCSET R7 200 C19 OPEN JU10 TP4 C11 0.01 F JU8 OPEN MD C9 470pF VCC1 C1 0.01 F R3 30 R37 OPEN R36 OPEN VCC1 R35 OPEN TP22 OUT+ J1 JU11 15 C12 OPEN 14 L5 OPEN R4 30 VCC1 R38 OPEN R39 OPEN R6 75 JU13 R5 30 SHUTDOWN2 R16 50k VCC1 R13 0 L2 1 H C16 0.1 F JU15 OPEN Q2 OPEN L1 OPEN VCC C20 OPEN TP2 C18 0.1 F C21 10 F GND TP9 TP1 JU9 VCC1 24 1 VCC VCC 17 C3 0.5pF 18 23 22 21 20 19 R34 OPEN VCC1 Q1 FDN306P APCFILT2 IN+ IN+ U4 OUT+ 16 OUTC5 0.1 F 3 C10 0.01 F 4 TP10 5 PC_MON 13 C8 470pF TP11 6 BC_MON BIAS CC J2 2 ININ- J3 TX_DISABLE SHUTDOWN GND V FAULT MODSET GND FAULT R11 4.3k JU5 D2 LED SHUTDOWN2 Figure 2. MAX3735 EV Kit Schematic--Electrical Configuration MAX3735 OUT+ VCC APCFILT1 MD C4 0.1 F APCSET GND C17 0.1 F R40 OPEN VCC1 R8 392 TP5 R41 0 D1 DIO-S1A VCC C7 470pF R14 RBC_MON 50k VCC1 TP6 C13 0.01 F TP8 7 VCC18 9 10 11 12 C15 0.01 F TP3 R17 50k RPC_MON BIAS R10 1.5k JU6 JU25 C2 OPEN C14 0.01 F VCC1 R2 5.1 Q4 FMMT591A RMODSET R15 50k MD JU7 MAX495 6 7 U2 4 2 3 BIAS Q3 FMMT491A Evaluates: MAX3735 _______________________________________________________ R9 511 MAX3735 Evaluation Kit 7 Evaluates: MAX3735 RAPCSET JU20 R30 50k JU22 1 TP15 VCC2 R22 200 TP19 C31 0.01 F SB6 SB1 SB2 SB3 R18 OPEN L4 1 H C27 500pF C37 0.01 F SB5 SB4 H1 VCC C41 10 F JU16 VCC2 VCC2 24 23 22 21 20 19 VCC2 18 R20 15 C34 0.01 F LASER TP12 C40 OPEN C38 0.1 F C39 0.1 F (SEE FIGURE 1) GND C36 0.01 F 6 5 TP13 4 VCC2 Q5 FDN306P APCSET APCFILT2 APCFILT1 C23 0.1 F VCC OUT- 17 OUT+ 16 OUT+ 15 C33 0.01 F VCC 14 R21 49.9 R19 11 2 IN+ U4 C22 0.1 F C30 0.01 F 4V CC 5 PC_MON TP18 3 IN- 1V CC GND MD PHOTODIODE D3 JU17 SHUTDOWN2 IN+ J5 IN- J4 TX_DISABLE MAX3735 1 2 3 C32 0.01 F L3 MURATA C35 0.01 F MAX3735 Evaluation Kit SHUTDOWN FAULT MODSET GND C26 470pF 7 VCC2 C28 0.01 F TP17 TP14 JU18 VCC2 WP JU19 R23 511 R26 4.7k R24 1.5k JU21 1 R31 50k RMODSET R25 4.3k VCC2 8 VCC R33 50k SHUTDOWN2 9 10 11 12 H0 VCC2 RPC_MON FAULT D4 D3 D2 D1 L1 MON2 MON1 GND MON3 R32 50k RBC_MON D6 LED VCC2 C4 Q6 FMMT491A GND OUT2 SDA H1 H0 L0 Figure 3. MAX3735 EV Kit Schematic--Optical Configuration C25 470pF 6 BC_MON BIAS 13 C24 8.2pF BLM18HG601SN1 TP16 (SEE FIGURE 1) VCC2 A1 IN1 A2 SCL C3 U3 OUT1 DS1858 C2 IN2 BGA C1 WP D5 LED R29 330 D4 LED R28 330 C29 0.01 F B1 B2 B3 B4 H1 A3 V CC A4 H0 R27 4.7k TP21 SDA J6 1 2 3 4 5 6 8 ________________________________________________________________________________________ TP20 SCL PHONE JACK MAX3735 Evaluation Kit Evaluates: MAX3735 Figure 4. MAX3735 EV Kit PC Component Placement Guide--Component Side Figure 5. MAX3735 EV Kit PC Component Placement Guide--Solder Side _______________________________________________________ 9 MAX3735 Evaluation Kit Evaluates: MAX3735 Figure 6. MAX3735 EV Kit PC Board Layout-- Component Side Figure 7. MAX3735 EV Kit PC Board Layout--Ground Plane 10 ________________________________________________________________________________________ MAX3735 Evaluation Kit Evaluates: MAX3735 Figure 8. MAX3735 EV Kit PC Board Layout--Power Plane Figure 9. MAX3735 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600___________________11 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products |
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