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19-1607; Rev 2; 9/02
MAX3869 Evaluation Kit
General Description
The MAX3869 evaluation kit (EV kit) is an assembled demonstration board that provides optical or electrical evaluation of the MAX3869. 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 50 terminated oscilloscope. The output of the optical evaluation section is configured for attachment to a laser/monitor diode. o Fully Assembled and Tested o 3.3V to 5.0V Operation o Input Termination Provided On-Board o Independent Electrical Monitoring of Modulation and Bias Currents
Features
Evaluates: MAX3869
Ordering Information
PART MAX3869EGJEVKIT MAX3869EVKIT *EP = exposed pad. TEMP RANGE -40C to +85C -40C to +85C IC PACKAGE 32 QFN 32 TQFP-EP*
Electrical Component List
DESIGNATION QTY C24, C25, C28, C32 C26, C27, C29, C30, C33 C37, C39 C40 C41, C45 C42 C43 C44 D3 J5-J9 4 5 2 1 2 1 1 1 1 5 DESCRIPTION 0.01F 10% ceramic capacitors (0402) 0.1F 10% ceramic capacitors (0603) 0.056F 10% ceramic capacitors (0603) 10F 20%, 16V tantalum capacitor AVX TAJC106M016 0.01F 10% ceramic capacitors (0603) 0.22F 10% ceramic capacitor (0805) 1000pF 10% ceramic capacitor (0402) Do not install LED, Digi-Key P363-ND SMA connectors, edge-mount EFJohnson 142-0701-801 or Digi-Key J502-ND Shunts Digi-Key S9000-ND 2-pin headers, 0.1in centers Digi-Key S1012-36-ND 1k ferrite beads (0805) Murata BLM21AH102SN1 1.2H inductor Coilcraft 1008LS-122XKBC 600 ferrite beads (0603) Murata BLM18AG601SN1 PNP transistor (SOT23) Zetex FMMT591A, 91A marking R41 R42 R44 R46 U2** U2** U3 TP2, TP3, TP8, TP10-TP13, TP17, TP18, VCC, GND None None 1 1 1 1 1 1 1 R40 1 DESIGNATION QTY R4, R17 R5, R22, R47 R23 R25, R26, R30, R31 R28, R29, R32, R33 R34 R37, R43 R38, R49 2 3 1 4 4 1 2 2 DESCRIPTION Do not install 1.5k 1% resistors (0603) 1k 1% resistor (0603) 84.5 1% resistors (0402) 124 1% resistors (0402) 110 1% resistor (0603) 392 1% resistors (0402) 49.9 1% resistors (0402) 100k variable resistor Bourns or Digi-Key 3296W-104-ND 50k variable resistor Bourns or Digi-Key 3296W-503-ND 200k variable resistor Bourns or Digi-Key 3296W-204-ND 24.9 1% resistor (0402) 15 1% resistor (0603) MAX3869EGJ, 32-pin QFN MAX3869EHJ, 32-pin TQFP-EP MAX495ESA Test points Digi-Key 5000K-ND MAX3869 data sheet MAX3869 EV kit circuit board, rev A
JU4, JU5 JU4, JU5 L7, L13 L9 L10, L11 Q2
2 2 2 1 2 1
11
1 1
**The MAX3869EHJ is included with the MAX3869EVKIT. *The MAX3869EGJ is included with the MAX3869EGJEVKIT. 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.
MAX3869 Evaluation Kit Evaluates: MAX3869
Optical Component List
DESIGNATION QTY C1-C4, C17, C38 C5, C10-C13 C6 C7 C8, C35 C16 C19 C20, C22, C36 D1 6 5 1 1 2 1 1 3 1 DESCRIPTION 0.01F 10% ceramic capacitors (0402) 0.1F 10% ceramic capacitors (0603) 1000pF 10% ceramic capacitor (0402) 0.056F 10% ceramic capacitor (0603) Do not install 0.22F 10% ceramic capacitor (0805) 10F 20%, 16V tantalum capacitor AVX TAJC106M016 0.01F 10% ceramic capacitors (0603) LED Digi-Key P363-ND SMA edge-mount connectors EF Johnson 142-0701-801 or Digi-Key J502-ND 2-pin headers, 0.1in centers Digi-Key S1012-36-ND Shunts Digi-Key S9000-ND 1k ferrite bead inductor (0805) Murata BLM21AH102SN1 600 ferrite bead inductor (0603) Murata BLM18HG601SN1 0 resistor (0603) 1.2H inductor Coilcraft 1008LS-122XKBC DESIGNATION QTY L5, L6 R1, R2 R3 R6, R7, R10, R11 R8, R9, R12, R13, R32 R14 R15 R16 R18 R19, R35 R20 R21 R27 R36 TP1, TP4, TP5, TP6, TP14, TP15, TP16, VCC, GND U1* U1* 2 2 1 4 5 1 1 1 1 2 1 1 1 1 DESCRIPTION 600 ferrite bead inductors (0603) Murata BLM18AG601SN1 1.5k 1% resistors (0603) 1k 1% resistor (0603) 84.5 1% resistors (0402) 124 1% resistors (0402) 50k variable resistor Bourns or Digi-Key 3296W-503-ND 200k variable resistor Bourns or Digi-Key 3296W-204-ND 100k variable resistor Bourns or Digi-Key 3296W-104-ND 110 1% resistor (0603) 392 1% resistors (0402) 27.4 1% resistor (0402) 49.9 1% resistor (0402) 24.9 1% resistor (0402) 43.2 1% resistor (0402) Test points Digi-Key 5000K-ND MAX3869EHJ, 32-pin TQFP-EP MAX3869EGJ, 32-pin QFN
J1-J4
4
JU1, JU2 JU1, JU2 L1 L2 L3 L4
2 2 1 1 1 1
9
1 1
*The MAX3869EHJ is included with the MAX3869EVKIT. The MAX3869EGJ is included with the MAX3869EGJEVKIT.
Component Suppliers
SUPPLIER AVX Coilcraft Murata Venkel Zetex PHONE 803-946-0690 847-639-6400 814-237-1431 800-950-8365 516-543-7100 FAX 803-626-3123 847-639-1469 814-238-0490 512-794-0087 516-864-7630
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
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MAX3869 Evaluation Kit
2) Remove the shunt from JU5 to enable the outputs. 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 10k resistance between pins 1 and 3 (test point 3 and ground). 4) Adjust R42, the BIAS potentiometer, for 10k resistance between pins 1 and 3 (test point 2 and ground). 5) Adjust R40, the APC potentiometer, for 10k 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 50 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 15 * * 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 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. 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. 12) Adjust R14 until the desired optical amplitude is achieved. Optical amplitude can be observed on an oscilloscope connected to an optical/electrical converter.
Evaluates: MAX3869
11) Adjust R41 until the desired laser modulation current is achieved.
IMOD = Signal amplitude (V) 25
Optical Evaluation
For optical evaluation of the MAX3869, configure the evaluation kit as follows: 1) If data is to be latched, remove the shunt from JU1 to enable the input clock; otherwise, leave the shunt in place. 2) Remove the shunt from JU2 to enable the outputs. 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:
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3
MAX3869 Evaluation Kit Evaluates: MAX3869
Adjustment and Control Descriptions (see Quick Start first)
COMPONENT OPTICAL JU1 JU2 -- R14 R15 ELECTRICAL JU4 JU5 J8 R41 R42 NAME FUNCTION Enables/disables the clock input. Shunt for direct data transmission. Remove shunt to enable clock input. Enables/disables the output currents. Shunting disables the part. Remove shunt for normal operation. Electrical Output Adjusts the laser modulation current. 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. For closed-loop operation, R16 or R40 adjusts the monitor diode current level. TTL low level indicates a failure in the APC loop. 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).
CLOCK DISABLE OUTPUT DISABLE Electrical Output SMA MOD BIAS
R16 TP1 D1
R40 TP10 D3
APC Fail Indicator Fail Indicator
4
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MAX3869 Evaluation Kit Evaluates: MAX3869
CONFIGURATION 1
CONFIGURATION 2
TOP OF PC BOARD VCC
R20 VCC
TOP OF PC BOARD VCC
R20 VCC
LD
TO-46 CAN LASER/PHOTODIODE PAIR
LD
TO-46 CAN LASER/PHOTODIODE PAIR
PD
PD
SOLDER BRIDGES
VCC
VCC
SOLDER BRIDGES TO MD
VCC
VCC
TO MD BOTTOM OF PC BOARD
BOTTOM OF PC BOARD
CONFIGURATION 3
CONFIGURATION 4
TOP OF PC BOARD VCC
R20 VCC
TOP OF PC BOARD VCC
R20 VCC
LD
TO-46 CAN LASER/PHOTODIODE PAIR
LD
TO-46 CAN LASER/PHOTODIODE PAIR
PD
PD
SOLDER BRIDGES
VCC
VCC
SOLDER BRIDGES TO MD
VCC
VCC
TO MD BOTTOM OF PC BOARD
BOTTOM OF PC BOARD
Figure 1. Attachment of Laser Diode/Monitor Diode to MAX3869 EV Kit _______________________________________________________________________________________ 5
Evaluates: MAX3869
TP8 R40 100k R47 1.5k TP3 TP13 VCC VCC TP2 R42 200k VCC 6 1 4 APC TEST CIRCUIT MAX495 3 BIAS U3 C41 0.01F Q2 FMMT591A R5 1.5k C42 0.22F MD VCC C24 0.01F C25 0.01F MD 32 N.C. VCC2 GND BIASMAX MODSET APCSET CAPC VCC3 VCC VCC 24 23 22 21 VCC 20 19 18 VCC 17 BIAS TP12 R4 OPEN C44 OPEN R44 24.9 R17 OPEN L13 MURATA BLM21A1025S 28 C43 1000pF 27 26 25 31 30 29 VCC R25 84.5 R22 1.5k R23 1k 3 2 7 2 R46 15 C45 0.01F VCC
MAX3869 Evaluation Kit
ENABLE
GND
BIASMON
MODMON
FAIL
APCFILT
GND
VCC JU5 R31 84.5 9 10 11 12 13 14 15 16
R32 124
JU4
VCC4
Figure 2. MAX3869 EV Kit Schematic--Electrical Configuration
R41 50k TP11 R28 124 1 VCC1 DATA+ GND3 MD 2 3 C28 0.01F 4 VCC1 VCC4 OUTOUT+ VCC4 BIAS CLK+ CLKVCC1 LATCH DATAGND4
6
U2 MAX3869
5 6 VCC 8 7 L10 MURATA BLM11A601SPT C39 0.056F R30 84.5 C37 L11 0.056F MURATA BLM11A601SPT J9 SMA VCC VCC R37 392 TP10 D3 LED C33 0.1F R34 110 TP17 C32 0.01F L7 MURATA BLM21A1025S VCC R33 124 R49 49.9 VCC TP18 R43 392 VCC
R38 49.9
VCC1
GND1
L9 1.2H
C40 10F
VCC
J7 SMA
C26 0.1F
DATA+
VCC
J8 SMA
R26 84.5
DATA-
C27 0.1F
R29 124
VCC
J5 SMA
C29 0.1F
CLK+
J6 SMA
CLK-
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C30 0.1F
TP6 R16 100k TP14 R14 50k VCC TP4 R15 200k R2 1.5k C16 0.22F SB2 SB5 SB1 C22 0.01F SB4 R3 1.0k TP5
R21 49.9
VCC VCC C20 0.01F
GND
L4 1.2H
C19 10F
MONITOR PHOTODIODE MOUNTING PADS (USE ANY TWO)
R1 1.5k VCC C2 0.01F 0 32 N.C. VCC2 GND MODSET APCSET CAPC VCC3 VCC BIASMAX C8 OPEN 28 C6 1000pF 24 23 22 21 VCC 20 19 18 17 L6 MURATA BLM18AG601SNI VCC4 VCC C4 0.01F VCC L1 MURATA BLM21AH102SNI VCC TP1 C5 0.1F D1 LED R18 110 R36 43 VCC C7 0.056F R20 27 L5 MURATA BLM18AG601SNI VCC VCC 27 26 25 31 30 29 C1 0.01F SB3 SB6 VCC
VCC C10 0.1F R6 84.5
J1 SMA R8 124 R7 84.5 1 VCC1 DATA+ GND3 MD 2 C3 0.01F DATAGND4 VCC1 VCC4 OUTOUT+ VCC4 BIAS FAIL APCFILT GND CLK+ CLKVCC1 LATCH ENABLE GND BIASMON MODMON 4 3
DATA+
VCC
C36 0.01F
J2 SMA
Figure 3. MAX3869 EV Kit Schematic--Optical Configuration
U1 MAX3869
5 6 VCC VCC 8 7 C12 0.1F R10 84.5 R27 24.9 R12 124 JU1 9 10 11 12 13 14 15 16 JU2 R11 84.5 C35 OPEN VCC R19 392 TP15 L2 MURATA BLM18AG601SNI C17 0.01F VCC TP16 R35 392 VCC VCC LASER DIODE MOUNTING PADS (USE TWO) C38 0.01F
DATA-
C11 R9 0.1F 124
J3 SMA
CLK+
VCC
J4 SMA
CLK-
Evaluates: MAX3869
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R32 C13 0.1F 124
MAX3869 Evaluation Kit
7
MAX3869 Evaluation Kit Evaluates: MAX3869
1.0"
1.0"
Figure 4. MAX3869 EV Kit Component Placement Guide-- Component Side
Figure 5. MAX3869 EV Kit PC Board Layout--Component Side
8
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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
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9
MAX3869 Evaluation Kit Evaluates: MAX3869
1.0"
1.0"
Figure 8. MAX3869 EV Kit PC Board Layout--Solder Side
Figure 9. MAX3869EGJ EV Kit Component Placement Guide-- Component Side
10
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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
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11
MAX3869 Evaluation Kit Evaluates: MAX3869
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 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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