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19-1644; Rev 1; 6/00
MAX3296 Shortwave or VCSEL (Common Cathode) Evaluation Kit
General Description
The MAX3296 shortwave or vertical cavity-surface emitting laser (VCSEL) evaluation kit (EV kit) is an assembled, surface-mount demonstration board that allows easy optical and electrical evaluation of the MAX3286 1.25Gbps laser driver or the MAX3296 2.5Gbps laser driver in the common-cathode configuration. Shortwavelength laser diodes (wavelength 980nm) and VCSELs typically require a common-cathode configuration. In the common-cathode configuration, the laser's cathode connects to ground and the laser is driven at its anode. The MAX3296 shortwave or VCSEL EV kit regulates the laser bias current to keep a constant photodiode current or the kit directly senses the laser bias current and holds it constant. Refer to the MAX3296EVKIT-LW for evaluation of the MAX3286/MAX3296 with long-wavelength laser diodes in the common-anode configuration. o Drives Common-Cathode Lasers o Includes Socket for Laser Insertion o LED Fault Indicator o Evaluates Either MAX3286 or MAX3296 (installed) o Adjustable DC Bias Current for VCSELs o Adjustable Photodiode Current o Adjustable Modulation Current o Adjustable Modulation Current Tempco o Configured for Electrical Operation, No Laser Necessary
Features
Evaluates: MAX3286/MAX3296
Ordering Information
PART MAX3296EVKIT-SW MAX3296CGISEVKIT TEMP. RANGE 0C to +70C 0C to +70C IC PACKAGE 32 TQFP 28 QFN
Component List
DESIGNATION QTY C1-C5, C13, C14, C22, C25, C26 C11 C12 C23 D1 D3 J1, J2, J5 10 DESCRIPTION 0.01F 10%, 16V min, X7R ceramic capacitors (0402) 0.1F 10%, 16V min, X7R ceramic capacitor (0402) Open, user supplied (0402)* 10F 10%, 16V tantalum capacitor AVX TAJC106K016 Open, user supplied (laser diode and photodiode assembly; see Figure 1) Red LED SMA connectors (edge mount) EFJohnson 142-0701-801 or Digi-Key J502-ND Test points Digi-Key 5000K-ND 2-pin headers (0.1in centers) Digi-Key S1012-36-ND Ferrite beads Murata BLM11HA102SG Ferrite bead Murata BLM11HA601SG R5 R9, R30 R10 R11 R12 R13 R20 R22 1 2 1 1 1 1 1 1 DESIGNATION QTY L8 Q1 1 0 1 0 1 3 Q2 Q4 R2 R3 R4 1 0 1 1 1 1 1 DESCRIPTION Ferrite bead (included but not installed) Murata BLM11HA102SG Open Zetex FMMT491A Zetex FMMT591A 115 1% resistor (0402) 100k variable resistor Bourns or Digi-Key 3296W-104-ND 50k variable resistor Bourns or Digi-Key 3296W-503-ND 10k variable resistor Bourns or Digi-Key 3296W-103-ND 1k 5% resistors (0402) 5.1k 5% resistor (0402) 200 variable resistor Bourns or Digi-Key 3296W-201-ND 0 resistor (0402) 24.9 1% resistor (0402)* 49.9 1% resistor (0402) 36 5% resistor (0603)
J7, J8 JU1-JU5 L1, L2 L4
2 5 2 1
Component List continues on next page. *These components are part of the compensation network, which reduces overshoot and ringing. Parasitic series inductance introduces a zero into the laser's frequency response. R13 and C12 add a pole to cancel this zero. The optimal values depend upon the laser used. Maxim recommends R13 = 24.9 and C12 = 2pF as a starting point. ________________________________________________________________ Maxim Integrated Products 1
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.
MAX3296 Shortwave or VCSEL (Common Cathode) Evaluation Kit Evaluates: MAX3286/MAX3296
Component List (continued)
DESIGNATION QTY R23 R24 R25 TP1, TP3, TP4, TP9, TP10, TP14, TP15, TP19, TP20 U1** U1** U1** U1** U2 1 1 1 9 1 1 1 1 1 DESCRIPTION 0 resistor (0603) 24.9 1% resistor (0402) 511 1% resistor (0402) Test points Digi-Key 5000k-NO MAX3296CHJ (32-pin TQFP) MAX3286CHJ (32-pin TQFP, included but not installed) MAX3296CGI (28-pin QFN) MAX3286CGI (28-pin QFN included but not installed) MAX4322EUK (5-pin SOT23) SHUNT SP3 SP4 SP5 SP6 SP7 SP8 SP9 SP10 SP11 STATUS Open Closed Closed Closed Closed Closed Open Open Closed
Refer to the MAX3286/MAX3296 Common-Cathode Laser with Photodiode application circuit in the MAX3286-MAX3289/MAX3296-MAX3299 data sheet. 2) Make sure nothing is installed in the laser socket (Figure 1). 3) Confirm that R24 is installed. 4) Make sure L8 is not installed. 5) Confirm that C12 is open. Without a laser installed, no compensation network is necessary. 6) Set potentiometer R5 (RSET) to midscale by turning the screw counterclockwise until a faint click is felt, then clockwise for 15 full revolutions (30 full revolutions in the 0 to 10k range of the multiturn potentiometer). This sets the regulation point for the simulated photodiode current to (2.65V - 1.7V) / 5k = 190A. The photodiode emulator circuit regulates the DC bias current out of Q4 to 28 x 190A 5mA. 7) Set potentiometer R4 (RMOD) to maximum resistance by turning the screw counterclockwise until a faint click is felt (30 full revolutions in the 0 to 50k range of the multiturn potentiometer). This minimizes the modulation current. 8) Set potentiometer R3 (RTC) to maximum resistance by turning the screw counterclockwise until a faint click is felt (30 full revolutions in the 0 to 100k range of the multiturn potentiometer). This minimizes the temperature coefficient (tempco) of the modulation current. 9) Set potentiometer R11 to 30 of resistance by turning the screw clockwise until a faint click is felt, then counterclockwise for five turns. 10) Place jumpers across JU2 (EN), JU3 (EN), and JU4 (PORDLY).
**The MAX3296/MAX3286CHJ parts are included with the MAX3296EVKIT-SW. The MAX3296/MAX3286CGI parts are included with the MAX3296CGIS.
Evaluating the MAX3286
TQFP Package
The MAX3296EVKIT-SW board can easily be modified to accommodate the MAX3286. Desolder and remove the MAX3296 (the EV board ships with the MAX3296CHJ installed), and replace it with the MAX3286CHJ (included with the EV kit). No other circuit modifications are necessary.
QFN Package
The MAX3296CGIS EV kit board can be modified to accommodate the MAX3286. Using a hot plate and a small heating block to localize the heat underneath the part, desolder and remove the MAX3296 (the EV board ships with the MAX3296CGI installed), and replace it with the MAX3286CGI (included with the EV kit). No other circuit modifications are necessary.
Electrical Quick Start
Electrical Quick Start with Simulated Photodiode Feedback
1) Configure the board so that it will servo the DC bias current, achieving a fixed photodiode current and activating the photodiode emulator circuit. Set up the following shunts:
2
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MAX3296 Shortwave or VCSEL (Common Cathode) Evaluation Kit
11) If you intend to power the board from a +5V supply, place a jumper across JU1 (LV). Do not apply power yet. 12) Make sure there is no jumper on JU5 (FLTDLY). 13) Attach a cable with 50 characteristic impedance between the J5 SMA output connector and the input of the oscilloscope. Make sure the oscilloscope input is 50 terminated. 14) Attach differential sources to SMA connectors J1 and J2. Each source should have a peak-to-peak amplitude between 100mV and 830mV. 15) Apply either +3.3V or +5V power to the board at the J7 (VCC) and J8 (GND) test points. Set the current limit to 300mA. 16) While monitoring the voltage on TP19, adjust R5 (RSET) until the desired DC bias current is obtained. Turning the R5 potentiometer screw clockwise increases the DC bias current. 17) While monitoring the J5 SMA connector output on the oscilloscope, adjust R4 (RMOD) until the desired modulation current is obtained. Turning the R4 potentiometer screw clockwise increases the modulation current. 3) Confirm that R24 is installed. 4) Make sure L8 is not installed. 5) Confirm that C12 is open. Without a laser installed, no compensation network is necessary. 6) Set potentiometer R11 to midscale by turning the screw counterclockwise until a faint click is felt, then clockwise for 15 full revolutions (30 full revolutions in the 0 to 200 range of the multiturn potentiometer). This sets the regulation point for the laser bias current to 0.25V / 100 = 2.5mA. 7) Set potentiometer R4 (RMOD) to maximum resistance by turning the screw counterclockwise until a faint click is felt (30 full revolutions in the 0 to 50k range of the multiturn potentiometer). This minimizes the modulation current. 8) Set potentiometer R3 (RTC) to maximum resistance by turning the screw counterclockwise until a faint click is felt (30 full revolutions in the 0 to 100k range of the multiturn potentiometer). This minimizes the tempco of the modulation current. 9) Place jumpers across JU2 (EN), JU3 (EN), and JU4 (PORDLY). 10) If you intend to power the board from a +5V supply, place a jumper across JU1 (LV). Do not apply power yet. 11) Make sure there is no jumper on JU5 (FLTDLY). 12) Attach a cable with 50 characteristic impedance between the J5 SMA output connector and the input of the oscilloscope. Make sure the oscilloscope input is 50 terminated. 13) Attach differential sources to SMA connectors J1 and J2. Each source should have a peak-to-peak amplitude between 100mV and 830mV. 14) Apply either +3.3V or +5V power to the board at the J7 (VCC) and J8 (GND) test points. Set the current limit to 300mA. 15) While monitoring the voltage on TP19, adjust R11 until the desired DC bias current is obtained. Turning the R11 potentiometer screw clockwise increases the DC bias current. 16) While monitoring the J5 SMA connector output on the oscilloscope, adjust R4 (R MOD ) until the desired modulation current is obtained. Turning the R4 potentiometer screw clockwise increases the modulation current.
Evaluates: MAX3286/MAX3296
Electrical Quick Start with Bias-Current Feedback (VCSEL)
1) Configure the board to directly regulate the DC bias current. Set up the following shunts:
SHUNT SP3 SP4 SP5 SP6 SP7 SP8 SP9 SP10 SP11 STATUS Closed Open Closed Closed Open Open Closed Closed Open
Refer to the MAX3286/MAX3296 Common-Cathode Laser Without Photodiode application circuit in the MAX3286-MAX3289/MAX3296-MAX3299 data sheet. 2) Make sure nothing is installed in the laser socket (Figure 1).
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3
MAX3296 Shortwave or VCSEL (Common Cathode) Evaluation Kit Evaluates: MAX3286/MAX3296
Emulating a Photodiode During Electrical Evaluation
When evaluating the MAX3286/MAX3296 without a laser (see Electrical Quick Start sections), the MAX3286/MAX3296 DC bias circuitry operates using a photodiode emulator circuit. When shunts SP6 and SP7 are shorted, U2 (MAX4322), Q2 (FMMT491A), and R30 form a current-controlled current source that emulates the behavior of the photodiode in the laser assembly. R22 takes the place of the laser diode, and the photodiode emulator circuitry sinks a current from the collector of Q2 equal to 3% of the current through R22. This simulates the behavior of a laser diode and photodiode assembly where a fraction of the laser light reflects onto the photodiode, which then outputs a small current proportional to the light emitted. then clockwise for 15 full revolutions (30 full revolutions in the 0 to 10k range of the multiturn potentiometer). This sets the regulation point for the photodiode current to (2.65V - 1.7V) / 5k = 190A. Set potentiometer R4 (RMOD) to maximum resistance by turning the screw counterclockwise until a faint click is felt (30 full revolutions in the 0 to 50k range of the multiturn potentiometer). This minimizes the modulation current (AC drive applied to laser). Set potentiometer R3 (RTC) to maximum resistance by turning the screw counterclockwise until a faint click is felt (30 full revolutions in the 0 to 100k range of the multiturn potentiometer). This minimizes the tempco of the modulation current. Set potentiometer R11 to 30 of resistance by turning the screw clockwise until a faint click is felt, then counterclockwise five turns. Attach a 50 SMA terminator to J5 to match the laser loading. Place jumpers across JU2 (EN), JU3 (EN), and JU4 (PORDLY). If you intend to power the board from a +5V supply, place a jumper across JU1 (LV). Do not apply power yet. Make sure there is no jumper on JU5 (FLTDLY). Attach differential sources to SMA connectors J1 and J2. Each source should have a peak-to-peak amplitude between 100mV and 830mV. Apply either +3.3V or +5V power to the board at the J7 (VCC) and J8 (GND) test points. While monitoring the laser output, adjust R5 (RSET) until the desired laser bias current is obtained. Turning the R5 potentiometer screw clockwise increases the laser bias current. While monitoring the laser output, adjust R4 (RMOD) until the desired laser modulation current is obtained. Turning the R4 potentiometer screw clockwise increases the laser modulation current. Look at the "eye" output on the oscilloscope. Laser overshoot and ringing can be improved by appropriate selection of R13 and C12, as described in the Designing the Laser-Compensation Filter Network section of the MAX3286-MAX3289/MAX3296- MAX3299 data sheet.
6)
7)
8)
_________________Optical Quick Start
Optical Quick Start with Photodiode Feedback
1) Configure the board so that it will servo the laser bias current, achieving a fixed photodiode current. Set up the following shunts: Refer to the MAX3286/MAX3296 Common-Cathode Laser with Photodiode applications circuit in the MAX3286-MAX3289/MAX3296-MAX3299 data sheet.
SHUNT SP3 SP4 SP5 SP6 SP7 SP8 SP9 SP10 SP11 STATUS Open Closed Closed Open Open Closed Open Open Closed
9) 10) 11)
12) 13)
14) 15)
16)
2) 3) 4) 5)
Remove R24. Install L8. Connect a laser to the board (Figure 1). Set potentiometer R5 (RSET) to midscale by turning the screw counterclockwise until a faint click is felt,
17)
4
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MAX3296 Shortwave or VCSEL (Common Cathode) Evaluation Kit
Optical Quick Start with Bias-Current Feedback (VCSELs)
1) Configure the board to directly regulate the laser bias current. Set up the following shunts: Refer to the MAX3286/MAX3296 Common-Cathode Laser Without Photodiode application circuit in the MAX3286-MAX3289/MAX3296-MAX3299 data sheet.
SHUNT SP3 SP4 SP5 SP6 SP7 SP8 SP9 SP10 SP11 STATUS Closed Open Closed Open Open Open Closed Closed Open
8) Attach a 50 SMA terminator to J5 to match the laser loading. 9) Place jumpers across JU2 (EN), JU3 (EN), and JU4 (PORDLY). 10) If you intend to power the board from a +5V supply, place a jumper across JU1 (LV). Do not apply power yet. 11) Make sure there is no jumper on JU5 (FLTDLY). 12) Attach differential sources to SMA connectors J1 and J2. Each source should have a peak-to-peak amplitude between 100mV and 830mV. 13) Apply either +3.3V or +5V power to the board at the J7 (VCC) and J8 (GND) test points. Set the current limit to 300mA. 14) While monitoring the laser output, adjust R11 until the desired DC bias current is obtained. Turning the R11 potentiometer screw clockwise increases the DC bias current. 15) While monitoring the laser output, adjust R4 (R MOD ) until the desired modulation current is obtained. Turning the R4 potentiometer screw clockwise increases the modulation current. 16) Look at the "eye" output on the oscilloscope. Laser overshoot and ringing can be improved by appropriate selection of R13 and C12 as described in the Designing the Laser-Compensation Filter Network section of the MAX3286-MAX3289/MAX3296- MAX3299 data sheet.
S M A 2
Evaluates: MAX3286/MAX3296
2) Remove R24. 3) Install L8. 4) Connect a laser to the board (Figure 1). 5) Set potentiometer R11 to midscale by turning the screw counterclockwise until a faint click is felt, then clockwise for 15 full revolutions (30 full revolutions in the 0 to 200 range of the multiturn potentiometer). This sets the regulation point for the laser bias current to 0.25V / 100 = 2.5mA. 6) Set potentiometer R4 (RMOD) to maximum resistance by turning the screw counterclockwise until a faint click is felt (30 full revolutions in the 0 to 50k range of the multiturn potentiometer). This minimizes the modulation current. 7) Set potentiometer R3 (RTC) to maximum resistance by turning the screw counterclockwise until a faint click is felt (30 full revolutions in the 0 to 100k range of the multiturn potentiometer). This minimizes the tempco of the modulation current.
1 4
1, 3 = GROUND 2 = LASER-DIODE ANODE 4 = PHOTODIODE CATHODE (LASER-DIODE CATHODE/PHOTODIODE ANODE)
3 MAX3286 MAX3296
Figure 1. Optical Connection Diagram
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5
MAX3296 Shortwave or VCSEL (Common Cathode) Evaluation Kit Evaluates: MAX3286/MAX3296
Table 1. Adjustment and Control Descriptions
COMPONENT D3 JU1 JU2 JU3 JU4 JU5 NAME FAULT LV EN EN PORDLY FLTDLY FUNCTION The LED shines red when a fault has occurred. The fault condition can be cleared by removing, then reinstalling, jumpers at JU2 or JU3. Placing a jumper on JU1 connects the LV pin to ground and programs the power-on reset circuit for +4.5V to +5.5V operation. Placing a jumper on JU2 ties the EN pin to VCC. When JU2 is not installed, the EN pin is pulled low by its internal pull-down. Placing a jumper on JU3 ties the EN pin to ground. When JU3 is not installed, the EN pin is pulled high by its internal pull-up. Placing a jumper on JU4 connects the PORDLY pin to a 0.01F capacitor (C5). Leaving JU4 open floats the PORDLY pin and minimizes the power-on reset time. Placing a jumper on JU5 disables the laser-driver safety features. Potentiometer R3, in conjunction with potentiometer R4 (RMOD), sets the tempco of the laser modulation current. Turn the potentiometer screw counterclockwise to increase the resistance. The tempco decreases when the potentiometer screw is turned counterclockwise. Potentiometer R4, in conjunction with potentiometer R3 (RTC), sets the peak-to-peak amplitude of the laser modulation current. Turn the potentiometer screw counterclockwise to increase the resistance. The laser modulation-current amplitude decreases when the potentiometer screw is turned counterclockwise. Potentiometer R5 adjusts the desired laser DC-current bias point. Potentiometer R5 sets the resistance from MD to ground, and MD regulates to 1.7V. Turn the potentiometer screw clockwise to decrease the resistance. The total range is 0 to 100k. The laser average power increases when the potentiometer screw is turned clockwise. R11 adjusts the amount of degeneration in the bias transistor when using a photodiode. When directly sensing bias current, R11 sets the regulation point.
R3
RTC
R4
RMOD
R5
RSET
R11
--
6
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J5 2 L8 1 R24 24.9
R23 0 VCC C14 0.01F L1 R13 24.9 TP20 SP6 2 1 3 D1 4 Q4 FMMT591A L2 VCC TP10 MODSET C2 0.01F TP9 TC TP4 TC VCC VCC GND VCC OUTOUT+ VCC SP5 Q1 VCC SP3 R11 200 SP7 Q2 FMMT491A E VCC TP15 R9 1k R10 5.1k SP9 SP8 R30 1k R22 36 TP19 C B1 MAX4322 U2 3 MODSET 32 31 30 29 28 27 26 25 C11 0.1F FAULT R4 50k RMOD C13 0.01F C12 OPEN
R12 0
R20 49.9 C25 0.01F
R3 100k RTC
R25 511
D3
VCC
IN+
IN-
GND
REF
FLTDLY
C5 0.01F 9 10 11 12 13 14 15 16
JU5 FLTDLY SP11 VCC TP14 VCC C23 10F C26 0.01F J1 J2 C1 0.01F C3 0.01F C4 0.01F R2 115 1% R5 10k RSET SP10
C22 0.01F
JU1 LV
VCC
J7
L4
J8
Evaluates: MAX3286/MAX3296
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TP3 FAULT TP1 POR
GND
LV
N.C.
Figure 2. MAX3296EVKIT-SW Evaluation Board Schematic
U1 MAX3296
SP4 JU3 EN 4 1 FAULT 2 N.C. 3 FAULT 4 POR 5 GND 6 EN 7 EN 8 PORDLY BIASDRV 24 23 SHDNDRV 22 GND 21 MON 20 MD 19 N.C. 18 POL 17 POL
VCC
A
C
RED LED
VCC
EN JU2
JU4
PORDLY
MAX3296 Shortwave or VCSEL (Common Cathode) Evaluation Kit
7
Evaluates: MAX3286/MAX3296
TC
VCC
VCC
OUT-
VCC FAULT FAULT FAULT POR TP1 GND VCC SP3 R11 200 2
A 1
C
MODSET
R25 500 FAULT SHDNDRV 19 18 17 16 15 VCC TP15 R9 1k R10 5k SP9 SP8 SP4 BIASDRV 21 20 Q1 SP5
VCC
IN+
IN-
GND
FLTDLY
JU4 8 9 10 11 12 13 14
C5 0.01F JU1 LV SP11 SP10 R5 10k RSET VCC VCC C23 10F C26 0.01F J1 1 2 J2 C1 0.01F C3 0.01F C4 0.01F TP14 R2 115 1%
LV
REF
MAX3296 Shortwave or VCSEL (Common Cathode) Evaluation Kit
Figure 3. MAX3296CGISEVKIT Evaluation Board Schematic
R23 0 VCC C14 0.01F L8 1 R24 OPEN L1 R13 24.9 TP20 VCC TP10 MODSET C2 0.01F C11 0.1F Q4 FMMT591 1 3 SP6 2 D1 4 C13 0.01F C12 OPEN 2 R12 0 C25 0.01F L2 R4 50k RMOD TP9 TC 28 27 26 25 24 23 22 OUT+ VCC TP4 VCC
8
U3 MAX3296M
MON MD POL POL SP7 Q2 FMMT491 E TP19 C B1 MAX4322 U2 3 EN JU3 JU3 EN 7 PORDLY 3 POR 4 GND 5 EN 6 EN 4 R30 1k R22 36 JU5 FLTDLY C22 0.01F
J5
R20 49.9
R3 100k RTC
D3
LED RED
VCC
J7
VCC1
L4
VCC
J8
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GND
MAX3296 Shortwave or VCSEL (Common Cathode) Evaluation Kit Evaluates: MAX3286/MAX3296
1.0"
1.0"
Figure 4. MAX3296EVKIT-SW Component Placement Guide--Top Silkscreen
Figure 5. MAX3296EVKIT-SW PC Board Layout--Component Side
1.0"
1.0"
Figure 6. MAX3296EVKIT-SW PC Board Layout--Ground Plane
Figure 7. MAX3296EVKIT-SW PC Board Layout--Power Plane
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9
MAX3296 Shortwave or VCSEL (Common Cathode) Evaluation Kit Evaluates: MAX3286/MAX3296
1.0"
1.0"
Figure 8. MAX3296EVKIT-SW PC Board Layout--Solder Side
Figure 9. MAX3296CGISEVKIT Component Placement Guide--Top Silkscreen
1.0"
1.0"
Figure 10. MAX3296CGISEVKIT PC Board Layout--Component Side
Figure 11. MAX3296CGISEVKIT PC Board Layout--Ground Plane
10
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1.0"
1.0"
Figure 12. MAX3296CGISEVKIT PC Board Layout--Power Plane
Figure 13. MAX3296CGISEVKIT 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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________11 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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