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19-1594 Rev 1; 2/01
MAX3669 Evaluation Kit
General Description
The MAX3669 evaluation kit (EV kit) is an assembled demonstration board that provides easy optical or electrical evaluation of the MAX3669, a 622Mbps laser driver with current monitors and automatic power control (APC) circuitry. Although the MAX3669 EV kit is shipped in the electrical configuration, this EV kit also provides configuration instructions for optical operation. o Fully Assembled and Tested o +3.3V or +5V Operation o On-Board Input Termination o Independent Electrical Monitoring of Modulation and Bias Currents
Features
Evaluates: MAX3669
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 MAX3669EVKIT
Ordering Information
TEMP. RANGE -40C to +85C IC PACKAGE 32 TQFP
Note: Please indicate that you are using the MAX3669 when contacting these component suppliers.
Component List for Electrical Configuration
DESIGNATION C1, C12 C2, C3, C6, C20 C4, C7, C10, C11 C8 C16 C19 C21 D1 J1, J2, J5 L3 P1 None Q1 R1, R2, R24 R3 R5 R6, R7, R21 R8, R9 R10, R11 R12 R13, R22, R25 R14 R15 R16 QTY 2 4 4 1 1 1 1 1 3 1 1 1 1 3 1 1 3 2 2 1 3 1 1 1 DESCRIPTION 0.01F 10% ceramic caps (0402) 0.01F 10% ceramic caps (0603) 1F ceramic capacitors (0805) 100pF 10% ceramic cap (0402) 0.1F 10% ceramic capacitor (0805) 10F 10%, 10V min tantalum cap AVX TAJC106K016 5pF 5% ceramic capacitor (0402) LED SMA connectors (edge mount) 1.2H inductor Coilcraft 1008LS-122XKBC 2-pin header (0.1in centers) Shunt for P1 PNP transistor Zetex FMMT591A 1.5k 5% resistors (0603) 1.0k 5% resistor (0603) 12.4 1% resistor (0402) 84.5 1% resistors (0603) 124 1% resistors (0603) 20 1% resistors (0603) 10 1% resistor (0402) 0 resistors (0603) 50k variable resistor 200k variable resistor 100k variable resistor DESIGNATION R18 R20 R23 R26, R28 U1 U3 VCC, GND, TP1, TP4, TP5, TP6, TP8-TP11 None None QTY 1 1 1 2 1 1 10 1 1 DESCRIPTION 110 5% resistor (0603) 0 resistor (0402) 15 5% resistor (0603) 392 1% resistors (0603) MAX3669EHJ 32-pin TQFP MAX495ESA 8-pin SOIC Test points MAX3669 data sheet MAX3669 EV kit PC board (Rev. A)
Component Modifications for Optical Configuration
DESIGNATION QTY J5 L2 R5 R13 R19 R20 R22 R23 U2 1 1 1 1 1 1 1 1 1 Remove 3.3H inductor Coilcraft 1008CS-332XKBC Remove Remove 20 5% resistor (0402) 5 5% resistor (0402) Remove Remove User-supplied laser diode 1 DESCRIPTION
________________________________________________________________ Maxim Integrated Products
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX3669 Evaluation Kit Evaluates: MAX3669
Quick Start
Electrical Setup (Default)
In the electrical configuration, an APC test circuit is included to emulate a semiconductor laser with a monitor photodiode. Monitor diode current is provided by Q1, which is controlled by an operational amplifier (U3). The APC test circuit, consisting of U3 and Q1, applies the simulated monitor diode current to the MAX3669's MD pin. The ratio of IBIAS / IMD is R24 / R23 = 100. To ensure proper operation in the electrical configuration, set up the evaluation board as follows: 1) Verify inductor L2 is not installed. 2) Remove the shunt from P1 to enable the output. 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 R14, the MOD (RMODSET) potentiometer, for 10k resistance between pins 2 and 3 (test point 5 and ground). 4) Adjust R15, the BIAS (RBIASMAX) potentiometer, for 10k resistance between pins 2 and 3 (test point 4 and ground). 5) Adjust R16, the APC (RAPCSET) potentiometer, for 10k resistance between pins 2 and 3 (test point 6 and ground). 6) Power up the board with a +3.3V supply. 7) Apply a differential input signal (max amplitude 800mV per side) to J1 and J2 (DATA+ and DATA-). 8) Attach a high-speed oscilloscope with 50 inputs to J5. 9) Adjust RBIASMAX (R15) and RAPCSET (R16) until the desired laser-bias current is achieved (refer to the note in the Applications Information section of the MAX3669 data sheet). 10) Adjust RMODSET (R14) until the desired laser-modulation current is achieved. Note: See Adjustment and Control Descriptions.
Optical Setup
For optical operation, the electrical APC test circuit must be disabled. For optical evaluation of the MAX3669, configure the EV kit as described in Component Modifications for Optical Configuration: 1) Remove the shunt from P1 to enable the output. 2) Connect a TO-style header laser and monitor diode (Figure 1) as follows: * Keeping the leads to the laser diode as short as possible, connect the laser diode on the component side of the board between R20 and V CC with the cathode connected to R20 and the anode connected to VCC. * Connect the monitor diode on the underside of the the board with the anode connected to the MAX3669's MD pin and the cathode connected to VCC. Note: When performing resistance checks, manually set the ohmmeter to a high range to avoid forward biasing the on-chip ESD protection diodes. 3) Adjust R14, the MOD (RMODSET) potentiometer, for maximum resistance between pins 2 and 3 (test point 5 and ground). 4) Adjust R15, the BIAS (RBIASMAX) potentiometer, for maximum resistance between pins 2 and 3 (test point 4 and ground). 5) Adjust R16, the APC (RAPCSET) potentiometer, for desired optical power. (Refer to the Design Procedure section of the MAX3669 data sheet.) 6) Power up the board with a +3.3V supply. 7) Apply a differential input signal (800mV per side) to J1 and J2 (DATA+ and DATA-). 8) Attach the laser-diode output to an optical/electrical converter. 9) Adjust R15 until LED D1 is no longer illuminated. Laser power can be monitored at the laser diode with an optical/electrical converter (refer to the note in the Applications Information section of the MAX3669 data sheet). 10) Adjust R14 until the desired optical amplitude is achieved. Optical amplitude can be observed on an oscilloscope connected to an optical/electrical converter.
2
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MAX3669 Evaluation Kit Evaluates: MAX3669
CONFIGURATION 1
CONFIGURATION 2
TOP OF PC BOARD TOP OF PC BOARD VCC VCC L2 VCC VCC L2 SOLDER BRIDGES TO-46 CAN LASER/PHOTODIODE PAIR BOTTOM OF PC BOARD SOLDER BRIDGES D3 D3 LD TO-46 CAN LASER/PHOTODIODE PAIR LD TO-46 CAN LASER/PHOTODIODE PAIR PD BOTTOM OF PC BOARD PD BOTTOM OF PC BOARD VCC VCC SOLDER BRIDGES VCC VCC L2 D3 LD PD VCC VCC
CONFIGURATION 3
CONFIGURATION 4
TOP OF PC BOARD
TOP OF PC BOARD
L2
VCC
VCC
VCC
VCC
TO-46 CAN LASER/PHOTODIODE PAIR
BOTTOM OF PC BOARD
SOLDER BRIDGES
D3 LD PD VCC VCC
Figure 1. Attachment of Laser Diode/Monitor Diode to MAX3669 EV Kit _______________________________________________________________________________________ 3
Evaluates: MAX3669
R16 100k RAPCSET TP3 CW TP5 R3 1.0k C15 C9 R4 R2 1.5k R1 1.5k C16 0.1F MD 31 30 N.C. N.C. GND N.C. CAPC VCC 24 23 22 21 20 VCC 19 18 17 VCC R10 20 C7 1F R19 R11 20 VCC C8 100pF R12 10 C4 1F R20 0 MODSET APCSET C1 0.01F 29 28 27 26 25 32 BIASMAX TP4 R14 50k RMODSET CW R15 200k RBIASMAX CW TP6 TP7
MAX3669 Evaluation Kit
GND
FAIL
N.C.
N.C.
GND
VCC
ENABLE
BIAS
R21 84.5 R29 P1 P3 VCC C19 10F C20 0.01F VCC TP10 D1 RED TP9 R18 110 C6 0.01F BIAS R22 0 C12 0.01F R25 0 TP1 C18 C5
P4 L2
VCC
P5
GND
L3 1.2H
VCC
R24 1.5k
VCC
Figure 2. MAX3669 EV Kit Schematic--Electrical Configuration
C2 0.01F 1 VCC VCC VCC VCC 3 DATA+ DATAGND VCC BIASMON OUT+ VCC VCC C21 5pF BIAS J5 OUT MODMON OUTVCC GND 4 2 MD
4
U1 MAX3669
GND 5 VCC C3 0.01F 7 8 TP8 VCC 9 10 11 12 13 14 15 16 R27 VCC R26 392 TP11 R28 392 6 R7 84.5 R5 12.4 4 5
U3
R17
VCC
J1
C10 1F
R6 84.5
DATA+
R8 124
J2
C11 1F
DATA-
R9 124
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2 3 R23 15
Q1 FMMT591A
MAX495
VCC
7
R13 0
MD
VCC
R17 TP6 TP3 TP5 R3 1.0k C15 C9 R4 R2 1.5k MD C16 0.1F 31 30 N.C. N.C. GND N.C. CAPC MODSET APCSET VCC 24 23 22 21 20 VCC 19 18 17 VCC R10 20 C7 1F R11 20 VCC C8 100pF R12 10 C4 1F R20 5 C1 0.01F 29 28 27 26 25 VCC R1 1.5k C2 0.01F 1 VCC VCC VCC VCC 3 DATA+ DATAGND VCC BIASMON OUT+ VCC FAIL N.C. N.C. GND VCC BIAS VCC C21 5pF BIAS MODMON ENABLE GND OUTVCC GND 4 2 MD BIASMAX 32 RMODSET CW R15 TP4 CW 200k R BIASMAX R16 100k RAPCSET CW R14 50k TP7
VCC
J1
C10 1F
R6 84.5
*
DATA+
U1 MAX3669
GND
R8 124 5 VCC C3 0.01F 7 8 TP8 VCC 9 10 11 12 13 14 15 16 R27 VCC VCC R26 392 TP11 R28 392 6
Figure 3. MAX3669 EV Kit Schematic--Optical Configuration
R7 84.5 R19 20 R29 P1 P3 VCC C19 10F VCC TP10 R5 D1 RED 4 5
U3
J2
C11 1F
DATA-
R9 124
R21 84.5 C5 C18
VCC C12 0.01F C20 0.01F R25 0 TP1
P4
L2 3.3H
GND
P5
L3 1.2H
VCC
R24 1.5k
R23 2 3 TP9 R18 110 R22
Q1 FMMT591A
MAX495
VCC C6 0.01F BIAS
7
* TO PHOTOLASER (SEE FIGURE 1 FOR PHOTOLASER CONNECTION).
R13
Evaluates: MAX3669
_______________________________________________________________________________________
VCC
MD
MAX3669 Evaluation Kit
5
MAX3669 Evaluation Kit Evaluates: MAX3669
Figure 4a. MAX3669 EV Kit Component Placement Guide--Component Side 6 _______________________________________________________________________________________
MAX3669 Evaluation Kit Evaluates: MAX3669
Adjustment and Control Descriptions
See Quick Start first. COMPONENT D1 J5 P1 R14 R15 NAME APC Fail Indicator LED Electrical Output SMA OUTPUT DISABLE RMODSET RBIASMAX FUNCTION Refer to the Design section of the MAX3669 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). Electrical Output. Remove for optical operation. Enable/Disable the Output Currents. Shunting disables the part. Remove shunt for normal operation. Laser Modulation Current Adjustment Laser-Bias Current Adjustment. In open-loop mode, R15 adjusts the laserbias current. In closed-loop operation, R15 adjusts the maximum laser-bias current. Automatic Power Control Adjustment. For closed-loop operation, R16 adjusts the monitor-diode current level. TTL low level indicates a failure in the APC loop.
R16 TP1
RAPCSET Fail Indicator Test Point
1.0"
1.0"
Figure 4b. MAX3669 EV Kit Component Placement Guide-- Component Side
Figure 5. MAX3669 EV Kit PC Board Layout--Component Side
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MAX3669 Evaluation Kit Evaluates: MAX3669
1.0"
1.0"
Figure 6. MAX3669 EV Kit PC Board Layout--Solder Side
Figure 7. MAX3669 EV Kit PC Board Layout--Ground Plane
1.0"
1.0"
Figure 8. MAX3669 EV Kit PC Board Layout--Power Plane
Figure 9. MAX3669 EV Kit Component Placement Guide-- 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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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