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19-1311; Rev 1; 3/98
MAX3667 Evaluation Kit
________________General Description
The MAX3667 evaluation kit (EV kit) is an assembled, surface-mount demonstration board that provides easy optical evaluation of the MAX3667.
____________________________Features
o Fully Assembled and Tested o Board is Configured for 3.3V Operation o PECL Input Termination Provided On-Board o Independent Electrical Monitoring of Modulation and Bias Currents
Evaluates: MAX3667
_______________Ordering Information
PART MAX3667EVKIT TEMP. RANGE -40C to +85C IC PACKAGE 32 TQFP
_______________________________________________________________________Component List
DESIGNATION QTY C1, C2, C4, C5, C7-C10, C12, C13, C15, C16, C17, C19 C3 C6, C14 C11 DESCRIPTION 0.1F 10%, 25V min ceramic capacitors DESIGNATION QTY R17, R18 14 R19 R21 SJ1, SJ2, SJ4 1 2 1 1000pF 10%, 25V min ceramic capacitor 1F 10%, 25V min ceramic capacitors 0.01F 10%, 25V min ceramic capacitor 100F 10%, 16V tantalum capacitors Digi-Key P5231-ND or Panasonic ECE-A1CGE101 130 1% resistors 50k Bournes variable resistors Digi-Key 3296W-503-ND 1.5k 5% resistors 100 1% resistors 82.5 1% resistors 4.75 1% resistor 20k 5% resistor 2k 5% resistor SJ5 L1 2 1 1 3 1 1 DESCRIPTION 49.9 1% resistors 232 1% resistor 22.1 1% resistor Trace gap jumpers. Short with solder. Trace gap jumper. Leave open. 470nH inductor Coilcraft 1008CS-471XKBC SMA connectors (edge mount) E.F. Johnson 142-0701-801 Digi-Key J502-ND 3-pin headers (0.1" centers) Digi-Key S1012-36-ND 2-pin header (0.1" center) Digi-Key S1012-36-ND 1-pin headers Mouser test point 151-203 Shunts Digi-Key S9000-ND MAX3667ECJ (32-pin TQFP) MAX3667 circuit board MAX3667 data sheet
J1-J4
4
C18, C20 R1, R2 R3, R5, R13 R4, R6 R7, R20 R8, R9 R11 R12 R15
2 2 3 2 2 2 1 1 1
JU1, JU3 JU10 VCC, GND JU1, JU3, JU10 U1 None None
2 1 2 3 1 1 1
______________Component Suppliers
SUPPLIER AVX Central Semiconductor Murata Zetex PHONE (806) 946-0690 (800) 282-4975 (516) 435-1110 (814) 237-1431 (800) 831-9172 (516) 543-7100 FAX (803) 626-3123 (516) 435-1824 (814) 238-0490 (516) 864-7630
_________________________Quick Start
1) Ensure that solder bridges SJ1, SJ2, and SJ4 are shorted. 2) Ensure that solder bridge SJ5 is open. 3) Install shunt JU3 between pins 1 and 2. 4) Install shunt JU1 between pins 2 and 3. 5) Open JU10. 6) Turn the R13 (APCSET) potentiometer counterclockwise to 50k (maximum turn).
1
________________________________________________________________ Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.
MAX3667 Evaluation Kit Evaluates: MAX3667
7) Turn the R3 (MODSET) potentiometer counterclockwise to 50k (maximum turn). 8) Attach a high-impedance voltmeter to J3 (BIASMON). 9) Attach a high-impedance oscilloscope to J4 (MODMON). 10) Apply a PECL-compatible differential input signal across J1 to J2. 11) Connect a TO46-style header laser diode and monitor (Figure 1). 12) Attach the laser diode output to an optical/electrical converter. 13) Power the board up with a +3.3V power source at the 3.3V pin and GND pin. Set the current limit to 300mA. 14) Adjust APCSET (R13) clockwise until the desired laser bias is achieved. Bias can be monitored at J3 (BIASMON). The conversion factor is (VBIASMON / 50) x 38 (typical) = IBIAS. Power can also be monitored at the laser diode with an optical/electrical converter. 15) Adjust MODSET (R3) clockwise until the desired modulation current is achieved. Modulation can be monitored at J4 (MODMON). The conversion factor is (VMODMON / 50) x 33 (typical) = IMOD. Modulation can also be observed on an oscilloscope connected to an optical/electrical converter.
_______________Adjustment and Control Descriptions (see Quick Start first)
COMPONENT R5 R13 R3 JU1 JU3 JU10 J3 NAME BIASSET APCSET MODSET DISABLE APC -- BIASMON FUNCTION In open-loop operation (APC not used) this potentiometer adjusts the bias current applied to the laser. Note that R6 limits the maximum bias current. In closed-loop operation (APC engaged) this potentiometer adjusts the bias current applied to the laser. Note that R15 limits the maximum bias current. This potentiometer adjusts the modulation current applied to the laser. Note that R4 limits the maximum modulation current. Shunting between pins 1 and 2 (high) disables the part. Shunting pins 2 and 3 enables the part. In closed-loop operation (APC engaged) pins 1 and 2 must be shunted. In open-loop operation pins 2 and 3 must be shunted. Open when in closed-loop mode. Shunted when in open-loop mode. Monitors the bias current at the laser. BIASMON is typically 1/38 of the actual laser bias current. When SJ1 is closed and using a high-impedance meter, current at BIASMON = VBIASMON / 49.9. Monitors the modulation current at the laser. If using a high-impedance scope, ensure that SJ2 is closed. IMODMON = (voltage on oscilloscope) / 49.9. IMODMON is typically 1/33 of the actual laser modulation current (IQMOD). If using a 50 terminated scope, ensure that SJ2 is open. Conversion factor is the same as above. See BIASMON (J3). See MODMON (J4). When using APC, this solder jumper should be shorted. When APC is not being used, ensure that the solder jumper is open. When using APC, this solder jumper should be open. When APC is not being used, ensure that the solder jumper is shorted.
J4
MODMON
SJ1 SJ2 SJ4 SJ5
50 termination 50 termination -- --
2
_______________________________________________________________________________________
MAX3667 Evaluation Kit Evaluates: MAX3667
SMA CONNECTORS
FOUR SOLDER WIRE CONTACTS: 2 TOP (LASER) AND 2 BOTTOM (MONITOR)
VIEW FROM TOP
VCC LASER ANODE CONNECTION
LASER DIODE/MONITOR ASSEMBLY
OPTIC
AL FIB
ER
VIEW FROM BOTTOM
VCC
MONITOR CATHODE CONNECTION
Figure 1. Attachment of Laser Diode/Monitor to MAX3667 EV Kit
_______________________________________________________________________________________
3
Evaluates: MAX3667
VCC
GND
GND
IMOD
IMOD
GND
+3.3V SJ5 25 MD IBIAS GND 15 14 13 12 11 10 1 R4 1.5k 2 9 R3 3 2 1 1 R5 3 R6 1.5k N.C. APCSET GND GND BIASSET APC MODSET N.C. GND IN+ INGND DISABLE GND N.C. 26 27 R7 100 16 C9 0.1F LASER
VCC
1
R13
3
R15 2k
PULLUP
MAX3667 Evaluation Kit
VCC
R17 49.9 1 2 3 4 5 6 7 8 J4 SMA +3.3V C1 0.1F +3.3V R8 82 JU1 1 C10 0.1F 2 3 +3.3V +3.3V VCC
Figure 2. MAX3667 EV Kit Schematic
C11 0.01F R11 4.7 R21 22 +3.3V C2 0.1F +3.3V 24 23 22 21 20 19 18 17 L1 470nH C5 0.1F C7 0.1F +3.3V C8 0.1F R12 20k C6 1F MONITOR
4
U1 MAX3667
BIASSET APC
2 3 JU3 C3 1nF C4 0.1F 28 29 BIASMON MODMON N.C. COMP 30 31 VFORCE
SJ4
APCSET
2
BIASMON
J3 SMA
32
MODSET
SJ1
R19 232 C17 0.1F GND C18 100F R20 100 C19 0.1F
VFORCE C20 100F
R18 49.9
MODMON
SJ2
J1 SMA JU10 C14 1F +3.3V R9 82 C12 0.1F C15 0.1F R1 130
VFORCE
_______________________________________________________________________________________
DISABLE
J2 SMA C13 0.1F R2 130
C16 0.1F
MAX3667 Evaluation Kit Evaluates: MAX3667
1.0"
1.0"
Figure 3. MAX3667 EV Kit Component Placement Guide
Figure 4. MAX3667 PC Board Layout--Top Solder Mask
_______________________________________________________________________________________
5
MAX3667 Evaluation Kit Evaluates: MAX3667
1.0"
1.0"
Figure 5. MAX3667 PC Board Layout--Solder Side
Figure 6. MAX3667 PC Board Layout--GND Plane
1.0"
Figure 7. MAX3667 PC Board Layout--Power Plane
6
_______________________________________________________________________________________
MAX3667 Evaluation Kit Evaluates: MAX3667
1.0"
1.0"
Figure 8. MAX3667 PC Board Layout--Component Side
Figure 9. MAX3667 PC Board Layout--Bottom Solder Mask
_______________________________________________________________________________________
7
MAX3667 Evaluation Kit Evaluates: MAX3667
NOTES
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) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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