10

MITSUBISHI

〈DIGITAL ASSP〉

M66512P/FP

LASER-DIODE DRIVER

EVALUATION OF SWITCHING OPERATION WAVEFORMS

Note: The delay from the DATA input to the laser light output contains the delay occurring in measuring systems.

SWITCHING OPERATION WAVEFORMS

DATA input

(2V/div)

Laser light output

(1mW/div)

10Mbit/s (t : 50ns/div)

20Mbit/s (t : 20ns/div)

25Mbit/s (t : 20ns/div)

40Mbit/s (t : 10ns/div)

3V

0V

3mW

0mW

1

2

3

4

5

6

7

8

9

10

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

GND

GND

CO

MO

DATA

PD

1RC

2RC

3RC

GND1

1RM

2RM

1RO

NC

GND2

LD

PD

DATA

CO

MO

NC

P.G.

50

Ω

680

Ω

680

Ω

680

Ω

50

Ω

2

Ω

100

Ω

RO

20

Ω

(

V

V

)

()

300pF

ML44114N

RD

0.1

µF

3k

Ω

RM

JP

22

µF

0.1

µF

Ta=25°

Connector

Light intensity

meter

Oscilloscope

(laser light output)

(

may vary depending on the kind

of the laser in use and the pattern

of the printed board.

(Note 9)

Oscilloscope (data input)

Evaluation Circuit

RC1

RC2

RC3

C

V