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19-4755; Rev 0; 12/97
MAX3766 Evaluation Kit
General Description
The MAX3766 evaluation kit (EV kit) is an assembled, surface-mount demonstration board that provides easy optical or electrical evaluation of the MAX3766 622Mbps laser driver.
____________________________Features
o Adjustable Modulation Temperature Coefficient o Automatic Safety Reset Delay with MAX809M o Automatic Power Control Evaluation in Electrical and Optical Configuration o Dual Layout Option on Single Board o Fully Assembled and Tested
Evaluates: MAX3766
Ordering Information
PART MAX3766EVKIT TEMP. RANGE -40C to +85C PIN-PACKAGE MAX3766EEP
Component List
DESIGNATION QTY B1 C1 C2, C12, C14 C4, C7, C10, C11, C15, C18 C8, C9 C16 C17 D1 SOCKETS JU5 IN+, IN-, IOUTJU1, JU3, JU4 JU1, JU3, JU4, JU5 1 1 3 6 2 1 1 4 1 DESCRIPTION Ferrite bead Murata BLM11A601S 10F 10%, 16V min tantalum cap AVX TAJC106K016 0.01F 10%, 25V min ceramic capacitors 0.1F 10%, 25V min ceramic capacitors DO NOT INSTALL 15pF 10%, 25V min ceramic capacitor 1F 10%, 10V min ceramic AVX0805ZC105k Pin sockets Digi-Key ED5042-ND 2-pin header (0.1" center) Digi-Key S1012-36-ND SMA connectors (edge mount) E.F. Johnson 142-0701-801 or Digi-Key J502-ND 3-pin headers (0.1" centers) Digi-Key S1012-36-ND Shunts Digi-Key S9000-ND R5, R7 R8, R20 R10, R11 R13 R14 R15, R16 R17 R18 R21 U1 U2 U3 +5V, GND None None 2 2 2 1 1 2 1 1 1 1 1 1 2 1 1 DESIGNATION QTY L1 Q1 R1 R2, R6, R9 R3, R12 R4 1 1 1 3 2 1 DESCRIPTION DO NOT INSTALL PNP transistor Zetex FMMT591, SOT23 0 jumper 50k variable resistors Bourns 3296 221, 1% resistors 20, 5% resistor 100k variable resistors Bourns 3296 5.1k, 5% resistors 68.1, 1% resistors 10, 5% resistor 24.9, 1% resistor 182, 1% resistors 33.2, 1% resistor 100k, 5% resistor 49.9, 1% resistor MAX3766EEP, QSOP-20 MAX495ESA, SOIC-8 MAX809MEUR-T Test points Mouser 151-203 MAX3766 circuit board (rev. C) MAX3766 data sheet
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________________________________________________________________ Maxim Integrated Products
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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.
MAX3766 Evaluation Kit Evaluates: MAX3766
Component Suppliers
SUPPLIER AVX Murata Zetex PHONE (806) 946-0690 (770) 436-1300 (516) 543-7100 FAX (803) 626-3123 (770) 436-3030 (516) 864-7630
______________Electrical Quick Start
1) Ensure that solder bridges JU7 and JU6 are shorted, and that solder bridge JU2 is open. 2) Install a shunt on JU5. 3) Install a shunt on JU3 between pins 2 and 3. 4) Install a shunt on JU1 between pins 2 and 3 (all fail conditions ignored). 5) Remove the shunt from JU4. 6) Turn the RTC potentiometer counterclockwise to 0k (minimum tempco). Also turn the RBIASMAX potentiometer clockwise to 0k. 7) Connect a 50 terminated oscilloscope from a 50 cable to IOUT-. Set the oscilloscope vertical gain to 100mV/div. 8) Apply a 500mV minimum differential input signal at IN- (J1) and IN+ (J2). 9) Power up the board with a 5V supply at the +5V and GND test pins. Set the current limit to 300mA. 10) Adjust RMODSET until a signal appears on the oscilloscope. The conversion gain from the MAX3766 modulation current to the oscilloscope output is 0.08mA/mV; therefore 750mV equals a modulation current of 60mA.
7) Turn RMODSET counterclockwise to 50k (minimum modulation current). 8) Turn RPOWERSET counterclockwise to 100k (minimum monitor diode (MD) current). 9) Insert a TO-46 packaged laser into D1. 10) Power up the board with a 5V supply at the +5V and GND test points. Set the current limit to 300mA. 11) Connect a 50 cable from IOUT- to a 50 terminated oscilloscope input. 12) Apply a 500mV minimum differential input signal at IN- (J1) and IN+ (J2). 13) Adjust RPOWERSET and RMODSET clockwise until the desired average optical power and amplitude are displayed on the oscilloscope attached to the optical-to-electrical converter. (Use caution: the modulation current could exceed the laser's damage rating.)
Compact Layout
A second, more compact layout is provided on this EV kit PC board. It is designed for optical evaluation only. The schematic is included (Figure 2), but no components are supplied. High-speed performance can be improved with the compact layout.
Laser Safety and IEC 825
Using the MAX3766 laser driver alone does not ensure that a transmitter design is compliant with IEC 825 eye safety requirements. The entire transmitter circuit and component selections must be considered. Each customer must determine the level of fault tolerance required by their application, recognizing that Maxim products are not designed or authorized for use as components in systems intended for surgical implant into the body, for applications intended to support or sustain life, or for any other application where the failure of a Maxim product could create a situation where personal injury or death may occur.
Optical Quick Start
1) 2) 3) 4) Ensure that solder bridges JU7 and JU2 are open. Ensure that solder bridge JU6 is shorted. Install a shunt on JU3 and JU4, between pins 2 and 3. Install a shunt on JU1 between pins 2 and 3 (all fail conditions ignored). 5) Turn the RTC potentiometer counterclockwise to 0k (minimum tempco). 6) Adjust the RBIASMAX potentiometer to a safe maximum biasing level for the laser diode used in this evaluation. Measure RBIASMAX from VREF1 to BIASMAX without power applied to the board. (From the MAX3766 data sheet it can be estimated that 1k sets up about 40mA of maximum laser bias current.)
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_______________________________________________________________________________________
MAX3766 Evaluation Kit Evaluates: MAX3766
Table 1. Adjustment and Control Descriptions (review Quick Start first)
CONTROL D1 NAME Laser Diode FUNCTION This is a socket for a laser in a TO-46 header (customer supplied). When the JU1 shunt is placed on pins 1 and 2, the MAX3766's safety features are enabled. The MAX809M ensures that failures at start-up are ignored until the voltage level set by the MAX809M is detected on VCC. This allows the MAX3766 to power up without generating a safety shutdown. Shunting pins 2 and 3 disables safety shutdown. This solder bridge should be shorted only for electrical evaluation when using automatic power control. Selects which EV kit layout to supply with power. Shunt pins 1 and 2 to power up U1 (larger layout). Shunt pins 2 and 3 to power up U4 (compact layout). Allows board to switch between optical monitor diode current (shunt pins 2 and 3) and electrically-emulated monitor diode current (shunt pins 1 and 2). Enables and disables the MAX3766. When shunted, the part is enabled. This solder bridge should be shorted. This solder bridge should be open for optical evaluation and shorted for electrical evaluation. When using the electrically emulated monitor diode current, R2 sets the ratio of laser current to monitor diode current. RTC sets the modulation current temperature compensation, 0k = minimum tempco (0ppm/C) to 100k = maximum tempco (~5600ppm/C). When in open-loop mode (automatic power control not used), this resistance sets the laser bias current (0k = maximum bias). When in closed-loop mode, it sets the maximum bias current available with automatic power control. Sets the monitor diode reference current in a closed-loop condition (automatic power control engaged). See MAX3766 data sheet for selection of RPOWERSET. Sets modulation current. 0k = maximum modulation current.
JU1
SAFETY
JU2 JU3 JU4 JU5 JU6 JU7 R2 R5
-- VCC/VCCA MD ENABLE -- -- COUPLING RTC
R6
RBIASMAX
R7 R9
RPOWERSET RMODSET
_______________________________________________________________________________________
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Evaluates: MAX3766
R1 0 3 2 JU3 1 2 COUPLING VCC R3 221 2 R4 20 C2 0.01F VCC 3 TP1 VREF1 RPOWERSET 1 TP9 2 VBIAS 7 Q1
MAX495
MAX3766 Evaluation Kit
Figure 1. MAX3766 EV Kit Schematic
VCC VCC VCCA R2 50k 1 L1 OPEN C1 10F 16V 3 1 2 2 RBIASMAX 3 TP2 BIASMAX VCC REF1 POWERSET 1 2 TP7 VMD C9 OPEN VCC R12 221 SMA 7 IN+ OUTVCCOUT VCC FAIL SAFETY 11 TP6 FAIL VCC JU5 VCC JU6 12 C16 15pF R20 5.1k C18 0.1F 13 GND VCC ENABLE R15 182 1% 8 9 10 VCC C8 OPEN C14 0.01F R16 182 1% 14 J3 R21 C15 IOUT49.9 0.1F 1% R17 33.2 R13 10 R14 24.9 JU7 VCC 1 2 C12 0.01F JU4 3 D1 LASER B1 FERRITE 3 4 MD 18 17 16 15 C4 0.1F 19 TP8 PWRSET VCC JU2 20 C7 0.1F 4 1 BIASMAX TC REF2 MOD GNDOUT BIAS OUT+ GND IN2 3 4 3 3 TP3 TC R7 100k 6 R6 50k R5 100k
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U2
RTC 1 TP4 VREF2 RMODSET 1 R9 50k 3 2
+5V
GND
VCC J1 SMA
U1 MAX3766
IN6
R10 68.1 1% TP5 MODSET
R11 68.1 1%
5
C10 0.1F
VCC
J2 SMA
IN+
C11 0.1F
_______________________________________________________________________________________
U3 MAX809M
RESET 2 1 GND R8 5.1k 12 JU1 R18 100k 3
C17 1F VCC
VCC VCC
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MAX3766 Evaluation Kit Evaluates: MAX3766
R19 R22
1 BIASMAX 2 TC 3 REF2 R24 4 MOD 5 GND
REF1 POWERSET
20 19 R23 VCCA 18 17 16 15 14 13 12 11 C19 1F R32 VCCA 24.9 1% VCCA R29 VCC 5.1k IP10 C20 15pF R31 24.9, 1% R30 10, 5% 1 2 C21 0.01F C24 OPEN B2 FERRITE 3 4 D2 LASER VCCA C22 0.1F
MD GNDOUT
VCCA R25 68.1 1%
U4 MAX3766
BIAS OUT+ OUTVCCOUT FAIL SAFETY
IN+ SMA
C23 0.1F
6 IN7 IN+
R26 182 1% VCCA
8 GND 9V CC C13 0.01F 10 ENABLE
R27 68.1 1% R28 182 1%
Figure 2. MAX3766 EV Kit Compact Layout (components not supplied, values are for reference only)
Compact Layout Component List (Not Installed and Not Supplied)
DESIGNATION QTY B2 C13, C21 C19 C20 C22, C23 C24 D2 SOCKET 1 2 1 1 2 0 4 DESCRIPTION Ferrite bead Murata BLM11A601S 0.01F capacitors 1F capacitor 15pF capacitor 0.1F capacitors DO NOT INSTALL Pin sockets Digi Key ED5042-ND SMA connector (edge mount) E.F. Johnson 142-0701-801 or Digi Key J502-ND _______________________________________________________________________________________ 5 DESIGNATION QTY R19, R22, R23, R24 R25, R27 R26, R28 R29 R30 R31, R32 U4 4 2 2 1 1 2 1 DESCRIPTION Resistors see (MAX3766 data sheet) 68.1, 1% resistors 182, 1% resistors 5.1k, 5% resistor 10, 5% resistor 24.9, 1% resistors MAX3766EEP QSOP-20
IN+
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MAX3766 Evaluation Kit Evaluates: MAX3766
1.0"
1.0"
Figure 3. MAX3766 EV Kit Component Placement Guide-- Component Side
Figure 4. MAX3766 EV Kit PC Board Layout--Component Side
1.0"
Figure 5. MAX3766 EV Kit PC Board Layout--Ground Plane
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MAX3766 Evaluation Kit Evaluates: MAX3766
1.0"
1.0"
Figure 6. MAX3766 EV Kit PC Board Layout--Power Layer
Figure 7. MAX3766 EV Kit PC Board Layout--Solder Side
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MAX3766 Evaluation Kit Evaluates: MAX3766
NOTES
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.
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_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
Printed USA is a registered trademark of Maxim Integrated Products.
(c) 1998 Maxim Integrated Products

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