MAX3766EVKIT Maxim Integrated, MAX3766EVKIT Datasheet

MAX3766EVKIT

Manufacturer Part Number

MAX3766EVKIT

Description

Laser Drivers Evaluation Kit for the MAX3766

Manufacturer

Maxim Integrated

Type

Laser Driverr

Datasheet

1.MAX3766EVKIT.pdf (7 pages)

Specifications of MAX3766EVKIT

Data Rate

155 Mbps to 622 Mbps

Operating Supply Voltage

5 V

Supply Current

25 mA

Maximum Power Dissipation

590 mW

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MAX3766 Evaluation Kit

______________Electrical Quick Start

1) Ensure that solder bridges JU7 and JU6 are shorted,

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

5) Remove the shunt from JU4.

6) Turn the RTC potentiometer counterclockwise to

7) Connect a 50Ω terminated oscilloscope from a 50Ω

8) Apply a 500mV minimum differential input signal at

9) Power up the board with a 5V supply at the +5V

10) Adjust RMODSET until a signal appears on the

1) Ensure that solder bridges JU7 and JU2 are open.

2) Ensure that solder bridge JU6 is shorted.

3) Install a shunt on JU3 and JU4, between pins 2 and 3.

4) Install a shunt on JU1 between pins 2 and 3 (all fail

5) Turn the RTC potentiometer counterclockwise to

6) Adjust the RBIASMAX potentiometer to a safe maxi-

AVX

Murata

Zetex

_______________________________________________________________________________________

conditions ignored).

0kΩ (minimum tempco).

mum 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 1kΩ sets up about 40mA of maximum laser

bias current.)

and that solder bridge JU2 is open.

conditions ignored).

0kΩ (minimum tempco). Also turn the RBIASMAX

potentiometer clockwise to 0kΩ.

cable to IOUT-. Set the oscilloscope vertical gain to

100mV/div.

IN- (J1) and IN+ (J2).

and GND test pins. Set the current limit to 300mA.

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.

SUPPLIER

(806) 946-0690

(770) 436-1300

(516) 543-7100

Component Suppliers

PHONE

Optical Quick Start

(803) 626-3123

(770) 436-3030

(516) 864-7630

FAX

7) Turn RMODSET counterclockwise to 50kΩ (mini-

8) Turn RPOWERSET counterclockwise to 100kΩ

9) Insert a TO-46 packaged laser into D1.

10) Power up the board with a 5V supply at the +5V

11) Connect a 50Ω cable from IOUT- to a 50Ω terminat-

12) Apply a 500mV minimum differential input signal at

13) Adjust RPOWERSET and RMODSET clockwise until

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 com-

ponents are supplied. High-speed performance can be

improved with the compact layout.

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 cus-

tomer 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 per-

sonal injury or death may occur.

mum modulation current).

(minimum monitor diode (MD) current).

and GND test points. Set the current limit to 300mA.

ed oscilloscope input.

IN- (J1) and IN+ (J2).

the desired average optical power and amplitude

are displayed on the oscilloscope attached to the

optical-to-electrical converter. (

modulation current could exceed the laser’s dam-

age rating.)

Laser Safety and IEC 825

Compact Layout

Use caution : the

Related parts for MAX3766EVKIT

MAX3766EVKIT Summary of contents

Page 1

MAX3766 Evaluation Kit Component Suppliers SUPPLIER PHONE AVX (806) 946-0690 Murata (770) 436-1300 Zetex (516) 543-7100 ______________Electrical Quick Start 1) Ensure that solder bridges JU7 and JU6 are shorted, and that solder bridge JU2 is open. 2) Install a shunt ...

Page 2

Table 1. Adjustment and Control Descriptions (review Quick Start first) CONTROL NAME D1 Laser Diode JU1 SAFETY JU2 — JU3 VCC/VCCA JU4 MD JU5 ENABLE JU6 — JU7 — R2 COUPLING R5 RTC R6 RBIASMAX R7 RPOWERSET R9 RMODSET _______________________________________________________________________________________ ...

Page 3

MAX3766 Evaluation Kit Figure 1. MAX3766 EV Kit Schematic 4 _______________________________________________________________________________________ ...

Page 4

R19 R22 VCCA R25 68.1 C23 1% IN+ 0.1 F SMA R26 182 1% VCCA 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 ...

Page 5

MAX3766 Evaluation Kit 1.0" Figure 3. MAX3766 EV Kit Component Placement Guide— Component Side Figure 5. MAX3766 EV Kit PC Board Layout—Ground Plane 6 _______________________________________________________________________________________ 1.0" Figure 4. MAX3766 EV Kit PC Board Layout—Component Side 1.0" ...

Page 6

Figure 6. MAX3766 EV Kit PC Board Layout—Power Layer _______________________________________________________________________________________ MAX3766 Evaluation Kit 1.0" Figure 7. MAX3766 EV Kit PC Board Layout—Solder Side 7 ...

Page 7

... 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 8 © ...

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