19-2367; Rev 0; 4/02 MAX3863 Evaluation Kit Features ♦ Fully Assembled and Tested ♦ 3.3V Operation ♦ Fully Matched for Best Return Loss ♦ Independent Electrical Monitoring of Modulation and Bias Currents ♦ Automatic Power Control (APC) Loop Test Circuit Ordering Information Component Suppliers SUPPLIER PHONE FAX PART TEMP RANGE IC PACKAGE MAX3863EVKIT -40°C to +85°C 32 QFN AVX 843-444-2863 843-626-3123 EFJohnson 402-474-4800 402-474-4858 Murata 415-964-6321 415-964-8165 Venkel 800-950-8365 512-794-0087 Note: Please indicate that you are using the MAX3863 when contacting these component suppliers. Electrical Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION C15, C16, C25, C26, C29, C31, C32, C37, C45 9 0.01µF ±10%, 10V ceramic capacitors (0402) J9 1 SMA connector, edge mount, tab contact EFJohnson 142-0701-851 C18, C21, C23, C24, C27, C28 6 0.1µF ±10%, 10V ceramic capacitors (0402) JU4 1 4-pin header, 0.1in center Digi-Key S1012-36-ND C30 1 470pF ±10%, 10V ceramic capacitors (0402) 7 Shunts Digi-Key S9000-ND C35 1 0.015µF ±10V, 10% ceramic capacitor (0402) JU4, JU7, JU9, JU10, JU12, JU16, JU19 JU7, JU12, JU16, JU19 4 1 10µF ±10%, 10V tantalum capacitor, case B 2-pin headers, 0.1in centers Digi-Key S1012-36-ND C41 1 0.01µF ±10%, 10V ceramic capacitor (0603) JU8, JU11, JU13, JU14, JU17, JU18 6 Open D3 1 LED red T1 pkg Digi-Key P363-ND JU9, JU10 2 3-pin headers, 0.1in centers Digi-Key S1012-36-ND L7, L12 2 33µH inductors (0805) Toko FSLB2520-330K 4 SMA connectors, edge mount, round contacts EFJohnson 142-0701-801 Note: Cut center pin to approximately 1/16in length. L9 1 1.2µH inductor Coilcraft 1008CS-122XKBC C40 J5–J8 ________________________________________________________________ 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. 1 Evaluates: MAX3863 General Description The MAX3863 evaluation kit (EV kit) is an assembled demonstration board. The MAX3863 EV kit contains two circuits, one for electrical evaluation and one for optical evaluation. The output of the electrical evaluation section is interfaced to an SMA connector, which can be connected to a 50Ω terminated oscilloscope. The output of the optical evaluation section is configured for attachment to a laser/monitor diode. MAX3863 Evaluation Kit Evaluates: MAX3863 Electrical Component List (continued) DESIGNATION QTY 2 DESCRIPTION L10, L11 2 2µH inductors (0603) Murata BLM18AG601SN1 Q2 1 PNP XSTR Zetex FMMT591 R4, R5, R26, R28, R37, R42 6 Open R12, R13, R43 3 100kΩ variable resistors Bourns 3296 R17 1 200Ω ±1% resistor (0603) R22 1 49.9Ω ±1% resistor (0402) R23, R25 2 Open (0402) R29 1 3.92kΩ ±1% resistor (0402) R30, R31 2 100Ω ±1% resistors (0603) R32 1 499Ω ±1% resistor (0402) R33, R40 2 0Ω resistors (0402) R34 1 1.5kΩ ±1% resistor (0402) R38 1 10kΩ ±1% resistor (0402) R41 1 Open, variable resistor R46 1 15Ω ±1% resistor (0603) R47 1 604Ω ±1% resistor (0603) R51 1 24.9Ω ±1% resistor (0402) TP2, TP3, TP8, TP10–TP13, TP17, TP18, TP20–TP28, TP31, TP32 20 Test points Digi-Key 5000K-ND U2 1 MAX3863EGJ 32-pin QFN Note: U1 has an exposed pad, which requires that it be solder attached to the circuit board to ensure proper functionality of the part. U3 1 MAX495ESA 8-pin SO Optical Component List DESIGNATION QTY DESCRIPTION C1–C5, C9, C14, C17, C33, C38 10 0.01µF ±10%, 10V ceramic capacitors (0402) C6 1 0.015µF ±10%, 10V ceramic capacitor (0402) C7, C10–C13 5 0.1µF ±10%, 10V ceramic capacitors (0402) C8 1 470pF ±10%, 10V ceramic capacitor (0402) C19 1 10µF ±10%, 10V tantalum capacitor, case B C20, C22 2 0.01µF ±10%, 10V ceramic capacitors (0603) C34 1 1pF ±10%, 10V ceramic capacitor (0201) C36 1 100pF ±5%, 10V ceramic capacitor (0603) D1 1 LED, red T1 pkg Digi-Key 363-ND D2 1 Laser diode, not included J1–J4 4 SMA connectors, edge mount, round contact EFJohnson 142-0701-801 Note: Cut center pin to approximately 1/16in long. JU1, JU2 2 3-pin headers, 0.1in centers Digi-Key S1012-36-ND JU1, JU2, JU3, JU15 4 Shunts Digi-Key S9000-ND JU3 1 4-pin header, 0.1in center Digi-Key S1012-36-ND JU15 1 2-pin header, 0.1in center Digi-Key S1012-36-ND L1 1 33µH inductor (0805) Toko FSLB2520-330K L2, L5, L6 3 2µH inductors (0603) Murata BLM18AG601SN1 L4 1 1.2µH inductor (1008) Coilcraft 1008CS-122XKBC _______________________________________________________________________________________ MAX3863 Evaluation Kit DESIGNATION QTY R1 1 499Ω ±1% resistor (0402) R2, R3 2 2kΩ ±1% resistors (0603) R6, R14, R16 3 100kΩ variable resistors Bourns 3296W R7, R15 2 0Ω resistors (0402) R8 1 Open, variable resistor R9 1 82Ω ±5% resistor (0201) R18 1 200Ω ±1% resistor (0603) R19 1 2kΩ ±1% resistor (0402) R20 1 20Ω ±1% resistor (0402) R21 1 10kΩ ±1% resistor (0402) R24 1 3.92kΩ ±1% resistor (0402) R27 1 24.9Ω ±1% resistor (0402) R36 1 Open (0402) R39, R45 2 100Ω ±1% resistors (0603) R48 1 1.5kΩ ±1% resistor (0402) TP1, TP4–TP7, TP9, TP14, TP15, TP16, TP19, TP29, TP30 U1 DESCRIPTION 12 Test points Digi-Key 5000K-ND 1 MAX3863EGJ 32QFN Note: U1 has an exposed pad, which requires that it be solder attached to the circuit board to ensure proper functionality of the part. None 1 MAX3863 evaluation circuit board, rev B None 1 MAX3863 EV kit data sheet None 1 MAX3863EGJ data sheet Quick Start The MAX3863 EV kit contains two circuits, one for electrical evaluation and one for optical evaluation. The optical circuit has solder pads suitable for mounting a laser diode module with a built-in monitor diode. The electrical circuit has a connector for a 50Ω oscilloscope hookup. In the electrical circuit, the monitor diode feedback is simulated by a current-controlled current source formed by U3 and Q2. Electrical Evaluation 1) If the data is latched, place the shunt for JU10 to ground RTEN to enable the clock input. Otherwise, set JU10 so that RTEN is connected to VCC. 2) Set the shunt JU9 to ground the EN input so that the MAX3863 is enabled. 3) Remove JU16 to enable the APC loop. The bias current is controlled by R43 and the gain of the APC test circuit. See Figure 2. 4) Remove JU4 to disable modulation compensation. 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) Adjust R13, the MODSET potentiometer, for 5.9kΩ between TP3 and ground. This sets the modulation current to approximately 40mA. Refer to the MAX3863 data sheet to program other values of IMOD. 6) Adjust R12, the BIASMAX potentiometer, for 2kΩ between TP2 and ground. This allows the APC loop to control IBIAS up to 100mA. 7) Adjust R43, the APCSET potentiometer, for 4.7kΩ between TP10 and ground. This sets I MD to 1.25mA. Given the APC test circuit gain of 0.025mA/mA, the required bias current is approximately 50mA. 8) Apply a differential input signal of 250mVP-P to the DATA inputs, and to the CLK inputs if retiming is enabled. INPUT VOLTAGE RANGE Peak-to-peak differential voltage 200mV to 1600mV Instantaneous voltage VCC - 1.5V to VCC + 0.5V 9) Attach a high-speed oscilloscope with 50Ω inputs to J9. 10) The bias current can be measured by: IBIAS = VTP13 − VTP22 15Ω 11) Power up the board with a +3.3V supply. 12) Add modulation compensation by installing JU4. Connect R34 to the MODCOMP pin to increase the modulation current by 0.5 times the bias current. _______________________________________________________________________________________ 3 Evaluates: MAX3863 Optical Component List (continued) Evaluates: MAX3863 MAX3863 Evaluation Kit Optical Evaluation 1) If the data is latched, place the shunt for JU2 to ground RTEN to enable the clock input. Otherwise, set JU2 so that RTEN is connected to VCC. 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. 2) To enable the part, set shunt JU1 so that EN is grounded. 6) Adjust R16, the MODSET potentiometer, for maximum resistance between test point 3 and ground. 3) To disable the APC loop, install JU15. This allows direct control of the bias current. 7) Adjust R14, the BIASMAX potentiometer, to give a bias current larger than the threshold current specified for the laser diode. A combined resistance value of 5.9kΩ gives approximately 40mA of bias current: 4) To eliminate interaction between the bias current and the modulation current, remove JU3. 5) The EV kit is designed to allow connection of various laser/monitor diode pin configurations. Connect a TO-header style laser with monitor diode (Figure 1) as follows: • • • 4 Keeping the module leads as short as possible, connect the laser diode cathode to the center pad on the component side of the circuit board. Connect the anode to one of the two remaining VCC pads, such that the monitor diodes leads can solder to the bottom of the circuit board. The monitor photodiode pads are arranged in a series of five pads on the bottom (solder side) of the PC board. Next to the five photodiode pads are three solder bridge pad pairs. The MD pin can be connected to any three of the five pads through a solder bridge. The remaining two of the five pads are connected to VCC. The VCC pads are placed between the pads going to the solder bridge pads. Solder the photodiode to the nearest two of the three pads going to the solder bridge pads (Figure 1). Connect the anode of the photo diode to the MD pin by adding a solder bridge to one of the three solder bridge positions. Connect the photodiode cathode to VCC by bridging the cathode pad to the adjacent VCC pad. IBIAS = 200 x 1.2V RBIAS 8) Apply a differential input signal of 250mVP-P to the DATA inputs, and to the CLK inputs if retiming is enabled. INPUT VOLTAGE RANGE Peak-to-peak differential voltage 200mV to 1600mV Instantaneous voltage VCC - 1.5V to VCC + 0.5V 9) Attach the laser diode fiber connector to an optical/electrical converter. 10) Power up the board with a +3.3V supply. 11) Adjust R16 until the desired optical amplitude is achieved. Optical amplitude can be observed on an oscilloscope connected to an optical/electrical converter. If the signal clips, the bias current might need to be increased. Refer to the Design Procedure section of the MAX3863 data sheet to set the modulation compensation factor. _______________________________________________________________________________________ MAX3863 Evaluation Kit COMPONENT NAME FUNCTION D1 FAIL INDICATOR The LED goes out if the monitor diode current is equal to its set point. If IBIAS reaches IBIASMAX before IMD reaches its set point, the LED lights. JU4 JU3 MODULATION COMPENSATION Controls the amount of IMOD that is proportional to IBIAS. Remove to make IMOD independent. Refer to the MAX3863 data sheet. JU9 JU1 OUTPUT ENABLE Enables/disables the current outputs. Shunt to ground for normal operation. Remove to switch modulation and bias outputs off. JU10 JU2 RETIMING ENABLE Enables/disables data retiming. Shunt to ground to enable data retiming. Remove shunt for direct data transmission. JU16 JU15 APC LOOP ENABLE R12 R14 BIAS ADJUST Adjusts laser bias current. R13 R16 MOD ADJUST Adjusts laser modulation current. R43 R6 APC SET POINT ADJUST ELECTRICAL OPTICAL D3 Install to set IBIASMAX. Remove to enable APC loop. Adjusts monitor diode set-point current. When the APC loop is enabled, the bias current increases until the monitor diode current is equal to its set point. _______________________________________________________________________________________ 5 Evaluates: MAX3863 Adjustment and Control Descriptions (see Quick Start first) Evaluates: MAX3863 MAX3863 Evaluation Kit TOP OF PC BOARD TOP OF PC BOARD LD LD TO-46 CAN LASER/PHOTODIODE PAIR TO-46 CAN LASER/PHOTODIODE PAIR BOTTOM OF PC BOARD BOTTOM OF PC BOARD PD PD SOLDER BRIDGES SOLDER BRIDGES TOP OF PC BOARD TO-46 CAN LASER/PHOTODIODE PAIR BOTTOM OF PC BOARD TOP OF PC BOARD LD TO-46 CAN LASER/PHOTODIODE PAIR BOTTOM OF PC BOARD PD SOLDER BRIDGES LD PD SOLDER BRIDGES GND GND VCC VCC VCC VCC GND GND Figure 1. Laser Diode/Monitor Diode Attachment to the MAX3863 EV Kit 6 _______________________________________________________________________________________ CLK- CLK+ DATA- DATA+ VCC J6 J5 J8 J7 GND1 C24 0.1µF C23 0.1µF C21 0.1µF C18 0.1µF TP24 TP28 L9 1.2µH JU10 VCC C40 10µF VCC C37 0.01µF 2 3 1 4 5 6 7 8 JU18 JU19 R42 OPEN R43 100kΩ JU17 C25 0.01µF C15 VCC 0.01µF R37 OPEN JU9 VCC C41 0.01µF JU12 R12 100kΩ TP10 JU16 VCC VCC CLK+ CLKVCC VCC DATA+ DATA- JU12 R4 OPEN TP2 TP3 MAX3863 U2 TP25 R40 0Ω C35 0.015µF R41 OPEN 9 10 11 12 13 14 15 16 TP26 TP21 24 23 22 21 20 19 18 17 TP12 R30 100Ω R31 100Ω R34 1.5kΩ TP17 MDMON MD VCC MODN MOD VCC BIAS FAIL TP20 C26 0.01µF VCC R33 0Ω TP27 TP18 VCC C16 0.01µF JU4 R32 499Ω 32 31 30 29 28 27 26 25 JU14 JU7 JU11 JU8 R5 OPEN R13 100kΩ R28 OPEN R26 OPEN RTEN EN BIASMAX MODSET MODCOMP VCC BIASMON MODMON APCSET APCFILT1 APCFILT2 PWC+ PWCVCC MK+ MK- TP11 TP23 VCC R29 3.92kΩ VCC C29 0.01µF C31 0.01µF MD 4 MD TOKO FSLB2520-330K C30 470pF 1 D3 LED R17 200Ω TOKO FSLB2520-330K MURATA BLM18AG601SN1 MURATA BLM18AG601SN1 3 2 Q2 FMMT591A C45 0.01µF 6 U3 VCC VCC R23 OPEN R25 OPEN C32 0.01µF L7 33µH L11 2µH L10 2µH L12 33µH VCC C27 0.1µF C28 0.1µF BIAS R22 49.9Ω R51 24.9Ω TP22 BIAS R46 15Ω TP13 APC TEST CIRCUIT MAX495 3 2 VCC VCC R47 604Ω J9 Evaluates: MAX3863 R38 10kΩ MAX3863 Evaluation Kit Figure 2. MAX3863 EV Kit Electrical Schematic _______________________________________________________________________________________ 7 J4 CLK- J3 CLK+ J2 DATA- J1 DATA+ GND VCC1 C13 0.1µF C12 0.1µF C11 0.1µF C10 0.1µF L4 1.2µH R21 10kΩ JU2 VCC1 C19 10µF Figure 3. MAX3863 EV Kit Optical Schematic _______________________________________________________________________________________ 4 5 6 7 8 2 3 1 R19 2kΩ TP15 R6 100kΩ C4 0.01µF C3 0.01µF R16 100kΩ JU15 VCC VCC CLK+ CLKVCC VCC DATA+ DATA- R14 100kΩ C2 VCC1 0.01µF VCC1 C20 0.01µF JU1 TP14 VCC1 TP5 TP6 VCC1 C1 0.01µF JU3 R1 499Ω 32 31 30 29 28 27 26 25 R2 2kΩ R3 2kΩ MAX3863 U1 RTEN EN BIASMAX MODSET MODCOMP VCC BIASMON MODMON 8 R7 0Ω C6 0.015µF R8 OPEN TP9 TP16 TP1 VCC R24 3.92kΩ TP7 24 23 22 21 20 19 18 17 VCC1 VCC1 R39 100Ω R45 100Ω R48 1.5kΩ MDMON MD VCC MODN MOD VCC BIAS FAIL TP19 R15 0Ω TP4 C5 0.01µF VCC1 9 10 11 12 13 14 15 16 APCSET APCFILT1 APCFILT2 PWC+ PWCVCC MK+ MK- C14 0.01µF C9 0.01µF D1 LED R36 OPEN MURATA BLM18AG601SN1 R18 VCC 200Ω C7 0.1µF R27 24.9Ω C8 470pF L1 33µH C33 0.01µF L6 2µH L5 2µH L2 2µH TOKO FSLB2520-330K VCC1 MURATA BLM18AG601SN1 MURATA BLM18AG601SN1 VCC SB5 SB1 SB2 SB6 R20 20Ω R9 82Ω 1 3 LASER SB3 C36 100pF C17 0.01µF VCC1 *SEE FIGURE 1 FOR LASER DIODE/ MONITOR ATTACHMENT. 2 D2 6 5 4 SB4 PHOTODIODE* C34 1pF VCC1 C22 0.01µF C38 0.01µF Evaluates: MAX3863 MAX3863 Evaluation Kit MAX3863 Evaluation Kit Evaluates: MAX3863 1.0" 1.0" Figure 4. MAX3863 EV Kit Component Placement Guide— Component Side Figure 5. MAX3863 EV Kit PC Board Layout—Solder Side _______________________________________________________________________________________ 9 Evaluates: MAX3863 MAX3863 Evaluation Kit 1.0" Figure 6. MAX3863 EV Kit PC Board Layout—Component Side 10 1.0" Figure 7. MAX3863 EV Kit PC Board Layout—Ground Plane ______________________________________________________________________________________ MAX3863 Evaluation Kit Evaluates: MAX3863 1.0" 1.0" Figure 8. MAX3863 EV Kit PC Board Layout—Power Plane Figure 9. MAX3863 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. 11 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.