19-1607; Rev 2; 9/02 MAX3869 Evaluation Kit Features The MAX3869 evaluation kit (EV kit) is an assembled demonstration board that provides optical or electrical evaluation of the MAX3869. ♦ Fully Assembled and Tested The EV kit is composed of two independent sections on the PC board. 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. ♦ Input Termination Provided On-Board ♦ 3.3V to 5.0V Operation ♦ Independent Electrical Monitoring of Modulation and Bias Currents Ordering Information PART TEMP RANGE IC PACKAGE MAX3869EGJEVKIT -40°C to +85°C 32 QFN MAX3869EVKIT -40°C to +85°C 32 TQFP-EP* *EP = exposed pad. Electrical Component List DESIGNATION QTY C24, C25, C28, C32 4 DESCRIPTION 0.01µF ±10% ceramic capacitors (0402) C26, C27, C29, C30, C33 5 0.1µF ±10% ceramic capacitors (0603) C37, C39 2 0.056µF ±10% ceramic capacitors (0603) 1 10µF ±20%, 16V tantalum capacitor AVX TAJC106M016 C41, C45 2 0.01µF ±10% ceramic capacitors (0603) C42 1 0.22µF ±10% ceramic capacitor (0805) C43 1 1000pF ±10% ceramic capacitor (0402) C44 1 Do not install D3 1 J5–J9 C40 DESIGNATION QTY DESCRIPTION R4, R17 2 Do not install R5, R22, R47 3 1.5kΩ ±1% resistors (0603) R23 1 1kΩ ±1% resistor (0603) R25, R26, R30, R31 4 84.5Ω ±1% resistors (0402) R28, R29, R32, R33 4 124Ω ±1% resistors (0402) R34 1 110Ω ±1% resistor (0603) R37, R43 2 392Ω ±1% resistors (0402) R38, R49 2 49.9Ω ±1% resistors (0402) R40 1 100kΩ variable resistor Bourns or Digi-Key 3296W-104-ND LED, Digi-Key P363-ND R41 1 50kΩ variable resistor Bourns or Digi-Key 3296W-503-ND 5 SMA connectors, edge-mount EFJohnson 142-0701-801 or Digi-Key J502-ND R42 1 200kΩ variable resistor Bourns or Digi-Key 3296W-204-ND 1 24.9Ω ±1% resistor (0402) 2 Shunts Digi-Key S9000-ND R44 JU4, JU5 R46 1 15Ω ±1% resistor (0603) 1 MAX3869EGJ, 32-pin QFN 2 2-pin headers, 0.1in centers Digi-Key S1012-36-ND U2** JU4, JU5 U2** 1 MAX3869EHJ, 32-pin TQFP-EP U3 1 MAX495ESA 2 1kΩ ferrite beads (0805) Murata BLM21AH102SN1 L9 1 1.2µH inductor Coilcraft 1008LS-122XKBC TP2, TP3, TP8, TP10–TP13, TP17, TP18, VCC, GND 11 Test points Digi-Key 5000K-ND L10, L11 2 600Ω ferrite beads (0603) Murata BLM18AG601SN1 None 1 MAX3869 data sheet None 1 MAX3869 EV kit circuit board, rev A L7, L13 Q2 1 PNP transistor (SOT23) Zetex FMMT591A, 91A marking **The MAX3869EHJ is included with the MAX3869EVKIT. *The MAX3869EGJ is included with the MAX3869EGJEVKIT. ________________________________________________________________ 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: MAX3869 General Description Evaluates: MAX3869 MAX3869 Evaluation Kit Optical Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION C1–C4, C17, C38 6 0.01µF ±10% ceramic capacitors (0402) L5, L6 2 600Ω ferrite bead inductors (0603) Murata BLM18AG601SN1 C5, C10–C13 5 0.1µF ±10% ceramic capacitors (0603) R1, R2 2 1.5kΩ ±1% resistors (0603) 1 1000pF ±10% ceramic capacitor (0402) R3 1 1kΩ ±1% resistor (0603) R6, R7, R10, R11 4 84.5Ω ±1% resistors (0402) R8, R9, R12, R13, R32 5 124Ω ±1% resistors (0402) R14 1 50kΩ variable resistor Bourns or Digi-Key 3296W-503-ND R15 1 200kΩ variable resistor Bourns or Digi-Key 3296W-204-ND R16 1 100kΩ variable resistor Bourns or Digi-Key 3296W-104-ND R18 1 110Ω ±1% resistor (0603) R19, R35 2 392Ω ±1% resistors (0402) R20 1 27.4Ω ±1% resistor (0402) R21 1 49.9Ω ±1% resistor (0402) R27 1 24.9Ω ±1% resistor (0402) R36 1 43.2Ω ±1% resistor (0402) TP1, TP4, TP5, TP6, TP14, TP15, TP16, VCC, GND 9 Test points Digi-Key 5000K-ND U1* 1 MAX3869EHJ, 32-pin TQFP-EP U1* 1 MAX3869EGJ, 32-pin QFN C6 C7 1 0.056µF ±10% ceramic capacitor (0603) C8, C35 2 Do not install C16 1 0.22µF ±10% ceramic capacitor (0805) 1 10µF ±20%, 16V tantalum capacitor AVX TAJC106M016 3 0.01µF ±10% ceramic capacitors (0603) C19 C20, C22, C36 D1 1 LED Digi-Key P363-ND J1–J4 4 SMA edge-mount connectors EF Johnson 142-0701-801 or Digi-Key J502-ND JU1, JU2 2 2-pin headers, 0.1in centers Digi-Key S1012-36-ND JU1, JU2 2 Shunts Digi-Key S9000-ND L1 1 1kΩ ferrite bead inductor (0805) Murata BLM21AH102SN1 L2 1 600Ω ferrite bead inductor (0603) Murata BLM18HG601SN1 L3 1 0Ω resistor (0603) L4 1 1.2µH inductor Coilcraft 1008LS-122XKBC Component Suppliers SUPPLIER PHONE FAX AVX 803-946-0690 803-626-3123 Coilcraft 847-639-6400 847-639-1469 Murata 814-237-1431 814-238-0490 Venkel 800-950-8365 512-794-0087 Zetex 516-543-7100 516-864-7630 *The MAX3869EHJ is included with the MAX3869EVKIT. The MAX3869EGJ is included with the MAX3869EGJEVKIT. 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 Q2, which is controlled by an operational amplifier (U3). The APC test circuit, consisting of U3 and Q2, applies the simulated monitor diode current (the laser bias current divided by a factor of 100) to the MD pin of the MAX3869. To ensure proper operation in the electrical configuration, set up the evaluation board as follows: 1) If data is to be latched, remove the shunt from JU4 to enable the input clock; otherwise, leave the shunt in place. 2 _______________________________________________________________________________________ MAX3869 Evaluation Kit • 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). • 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. Three of these pads (the middle and outside positions) are initially not connected. The other two pads are connected to VCC. Solder the anode and cathode of the monitor photodiode to any two of the three pads that are not connected. Then connect the anode to the MD pin by shorting the corresponding solder jumper (Figure 1). Connect the cathode to VCC by using solder to bridge to an adjacent VCC pad. 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 R41, the MOD potentiometer, for 10kΩ resistance between pins 1 and 3 (test point 3 and ground). 4) Adjust R42, the BIAS potentiometer, for 10kΩ resistance between pins 1 and 3 (test point 2 and ground). 5) Adjust R40, the APC potentiometer, for 10kΩ resistance between pins 1 and 3 (test point 8 and ground). 6) Apply a differential input signal (max amplitude ≤800mV per side) to J7 and J8 (DATA+ and DATA-). 7) If the latch is enabled, apply a differential clock signal (max amplitude ≤ 800mV per side) to J5 and J6 (CLK+ and CLK-). 8) Attach a high-speed oscilloscope with 50Ω inputs to J9. 9) Power up the board with a +3.3V supply. 10) Adjust R42 until the desired laser bias current is achieved. IBIAS = VTP13 - VTP12 15Ω 11) Adjust R41 until the desired laser modulation current is achieved. IMOD = Signal amplitude (V) 25Ω Optical Evaluation For optical evaluation of the MAX3869, configure the evaluation kit as follows: Note: When performing resistance checks, manually set the ohmmeter to a high range to avoid for ward biasing the on-chip ESD protection diodes. 4) Adjust R14, the MOD potentiometer, for maximum resistance between pins 1 and 3 (test point 5 and ground). 5) Adjust R15, the BIAS potentiometer, for maximum resistance between pins 1 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 MAX3869 data sheet.) 7) Apply a differential input signal (≤800mV per side) to J1 and J2 (DATA+ and DATA-). 8) Apply a differential clock signal (≤800mV per side) to J3 and J4 (CLK+ and CLK-). 9) Attach the laser diode fiber connector to an optical/electrical converter. 10) Power up the board with a +3.3V supply. 1) If data is to be latched, remove the shunt from JU1 to enable the input clock; otherwise, leave the shunt in place. 11) Adjust R15 until the LED, D1, is no longer illuminated. Optical power can be observed on an oscilloscope connected to an optical/electrical converter. 2) Remove the shunt from JU2 to enable the outputs. 12) Adjust R14 until the desired optical amplitude is achieved. Optical amplitude can be observed on an oscilloscope connected to an optical/electrical converter. 3) 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: _______________________________________________________________________________________ 3 Evaluates: MAX3869 2) Remove the shunt from JU5 to enable the outputs. MAX3869 Evaluation Kit Evaluates: MAX3869 Adjustment and Control Descriptions (see Quick Start first) COMPONENT 4 NAME FUNCTION OPTICAL ELECTRICAL JU1 JU4 CLOCK DISABLE Enables/disables the clock input. Shunt for direct data transmission. Remove shunt to enable clock input. JU2 JU5 OUTPUT DISABLE Enables/disables the output currents. Shunting disables the part. Remove shunt for normal operation. — J8 Electrical Output SMA R14 R41 MOD Electrical Output Adjusts the laser modulation current. R15 R42 BIAS Adjusts the laser bias current. In open-loop mode, R15 or R42 adjusts the laser bias current. In closed-loop operation, R15 or R42 adjusts the maximum laser bias current. R16 R40 APC For closed-loop operation, R16 or R40 adjusts the monitor diode current level. TP1 TP10 Fail Indicator TTL low level indicates a failure in the APC loop. D1 D3 Fail Indicator Refer to the Design section of the MAX3869 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). _______________________________________________________________________________________ MAX3869 Evaluation Kit VCC VCC VCC TO-46 CAN LASER/PHOTODIODE PAIR PD PD VCC VCC LD TO-46 CAN LASER/PHOTODIODE PAIR LD SOLDER BRIDGES R20 TOP OF PC BOARD R20 TOP OF PC BOARD VCC VCC SOLDER BRIDGES VCC TO MD TO MD BOTTOM OF PC BOARD BOTTOM OF PC BOARD CONFIGURATION 3 CONFIGURATION 4 R20 TOP OF PC BOARD R20 TOP OF PC BOARD VCC VCC VCC VCC TO-46 CAN LASER/PHOTODIODE PAIR LD VCC TO-46 CAN LASER/PHOTODIODE PAIR LD PD SOLDER BRIDGES Evaluates: MAX3869 CONFIGURATION 2 CONFIGURATION 1 PD VCC SOLDER BRIDGES VCC VCC TO MD BOTTOM OF PC BOARD TO MD BOTTOM OF PC BOARD Figure 1. Attachment of Laser Diode/Monitor Diode to MAX3869 EV Kit _______________________________________________________________________________________ 5 GND1 VCC1 CLK- J6 SMA J5 SMA J8 SMA CLK+ DATA- DATA+ J7 SMA L9 1.2µH C30 0.1µF VCC C29 0.1µF C27 0.1µF VCC VCC R33 124Ω R31 84.5Ω VCC R29 124Ω R26 84.5Ω C26 0.1µF C40 10µF VCC TP11 R32 124Ω R30 84.5Ω R28 124Ω R25 84.5Ω C41 0.01µF VCC C28 0.01µF VCC JU5 JU4 8 7 6 5 4 3 2 1 TP2 R37 392Ω C24 0.01µF TP17 VCC R5 1.5kΩ R42 200kΩ 32 R22 1.5kΩ 10 TP18 9 LATCH VCC1 CLK- CLK+ VCC1 DATA- DATA+ VCC1 31 30 TP3 29 28 R23 1kΩ 27 Figure 2. MAX3869 EV Kit Schematic—Electrical Configuration _______________________________________________________________________________________ D3 LED R43 392Ω VCC TP10 14 MAX3869 U2 12 13 VCC 11 BIASMAX GND R41 50kΩ MODSET BIASMON TP8 GND APCFILT R38 49.9Ω APCSET MODMON VCC2 ENABLE N.C. FAIL 26 MD BIAS VCC4 OUT+ OUT- VCC4 GND4 GND3 16 R34 110Ω 15 25 VCC VCC3 R40 100kΩ CAPC GND 6 VCC VCC4 C33 0.1µF TP12 17 18 19 20 21 22 23 24 C25 0.01µF C42 0.22µF C32 0.01µF BIAS VCC VCC VCC VCC VCC MD R4 OPEN C44 OPEN R17 OPEN 3 Q2 FMMT591A 2 6 7 U3 MD C37 L11 0.056µF MURATA BLM11A601SPT R49 49.9Ω J9 SMA R44 24.9Ω L10 MURATA BLM11A601SPT C39 0.056µF L7 MURATA BLM21A1025S 2 MAX495 3 C43 1000pF 4 L13 MURATA BLM21A1025S 1 C45 0.01µF VCC R47 1.5kΩ VCC TP13 R46 15Ω APC TEST CIRCUIT VCC BIAS Evaluates: MAX3869 MAX3869 Evaluation Kit _______________________________________________________________________________________ GND CLK- CLK+ DATA- DATA+ J4 SMA J3 SMA J2 SMA J1 SMA L4 1.2µH R11 84.5Ω R32 C13 0.1µF 124Ω VCC R12 124Ω R10 84.5Ω R8 124Ω C12 0.1µF VCC C11 R9 0.1µF 124Ω C20 0.01µF R6 84.5Ω VCC R7 84.5Ω C10 0.1µF VCC VCC C19 10µF TP15 VCC C3 0.01µF VCC VCC R19 392Ω JU2 JU1 C2 0.01µF R1 1.5kΩ R15 200kΩ 8 7 6 5 4 3 2 1 32 R2 1.5kΩ TP4 11 VCC 10 TP16 9 LATCH VCC1 CLK- CLK+ VCC1 DATA- DATA+ VCC1 31 30 BIASMAX GND VCC TP5 MODSET BIASMON R14 50kΩ 29 28 R3 1.0kΩ D1 LED R35 392Ω VCC TP1 12 13 14 MAX3869 U1 27 GND APCFILT TP14 26 CAPC 25 VCC MD 17 18 19 20 21 22 23 24 VCC C5 0.1µF C4 0.01µF BIAS VCC4 OUT+ OUT- VCC4 GND4 GND3 16 R18 110Ω 15 GND R21 49.9Ω APCSET MODMON VCC2 ENABLE N.C. FAIL VCC3 VCC4 TP6 VCC C1 0.01µF C16 0.22µF VCC L1 MURATA BLM21AH102SNI L2 C35 OPEN R36 43Ω C7 0.056µF C6 1000pF SB6 SB5 SB4 R27 24.9Ω R20 27Ω VCC LASER DIODE MOUNTING PADS (USE TWO) MURATA BLM18AG601SNI L5 MURATA BLM18AG601SNI L6 MURATA BLM18AG601SNI VCC VCC C8 OPEN VCC 0Ω SB3 SB2 SB1 MONITOR PHOTODIODE MOUNTING PADS (USE ANY TWO) VCC VCC VCC C36 0.01µF C22 0.01µF C38 0.01µF C17 0.01µF Evaluates: MAX3869 R16 100kΩ MAX3869 Evaluation Kit Figure 3. MAX3869 EV Kit Schematic—Optical Configuration 7 Evaluates: MAX3869 MAX3869 Evaluation Kit 1.0" Figure 4. MAX3869 EV Kit Component Placement Guide— Component Side 8 1.0" Figure 5. MAX3869 EV Kit PC Board Layout—Component Side _______________________________________________________________________________________ MAX3869 Evaluation Kit Evaluates: MAX3869 1.0" 1.0" Figure 6. MAX3869 EV Kit PC Board Layout—Ground Plane Figure 7. MAX3869 EV Kit PC Board Layout—Power Plane _______________________________________________________________________________________ 9 Evaluates: MAX3869 MAX3869 Evaluation Kit 1.0" Figure 8. MAX3869 EV Kit PC Board Layout—Solder Side 10 1.0" Figure 9. MAX3869EGJ EV Kit Component Placement Guide— Component Side ______________________________________________________________________________________ MAX3869 Evaluation Kit Evaluates: MAX3869 1.0" 1.0" Figure 10. MAX3869EGJ EV Kit PC Board Layout—Component Side Figure 11. MAX3869EGJ EV Kit PC Board Layout—Ground Plane ______________________________________________________________________________________ 11 Evaluates: MAX3869 MAX3869 Evaluation Kit 1.0" 1.0" Figure 12. MAX3869EGJ EV Kit PC Board Layout—Power Plane Figure 13. MAX3869EGJ EV Kit PC Board Layout—Solder Side Maxim makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Maxim assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different applications. All operating parameters, including “typicals” must be validated for each customer application by customer’s technical experts. Maxim products are not designed, intended or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Maxim product could create a situation where personal injury or death may occur. 12 ____________________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.