M66512FP 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC

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M66512FP

LASER-DIODE DRIVER

MITSUBISHI ELECTRIC  

MITSUBISHI 〈DIGITAL ASSP〉

M66512P/FP

LASER-DIODE DRIVER

FUNCTION

The M66512 is a semiconductor laser-diode driver for driving

a specific type (Mitsubishi’s N type) of laser, in which the an-

ode of a semiconductor laser diode is connected in stem

structure to the cathode of a monitoring photodiode.

The amplitude of laser drive current is set by applying a con-

stant voltage from an external source. For that purpose, the

M66512 has two voltage applying pins, which they are inde-

pendent each other, This mechanism makes it possible to set

a drive current with great accuracy.

As the IC is equipped with a pin to provide a forced OFF of

current circuit, it is possible to prevent a large current flowing

through laser diodes at the moment of power ON.

Regarding the detection of laser power, a monitor current

generated by a monitoring photodiode, which is incorporated

in laser unit, is drawn and converted into changes in voltage

by means of an external resistor, in order to output as an ana-

log signal. Simultaneously, the converted voltage is com-

pared with the internal reference voltage, thence the result is

output in TTL level as logic information.

PIN DESCRIPTIONS

Pin

Name

LD

Laser connection pin

PD

Monitoring diode connection pin

VL1

Voltage input pin for IL1 setting

1RC

Load resistor connection pin for IL1 setting

VL2

Voltage input pin for IL2 setting

2RC

Load resistor connection pin for IL2 setting

3RC

Load resistor connection pin for IL3 setting

DATA

1RM,

2RM

MO

CO

VOFF

RO

VCC1

Switching data input pin

Load resistor connection pins for monitoring

function

Analog output pin for monitoring function

Comparator output pin for monitoring function

Laser current forced OFF input pin

Load resistor connection pin for laser current

Power supply pin 1

VCC2

Power supply pin 2

GND1

GND2

GND pin 1

GND pin 2

Functions

Connect to cathode on semiconductor laser diode.

Connect to cathode on monitoring photodiode.

Voltage input to set output current (IL1) of current source 1.

Connect load resistor between this pin and GND for IL1 setting.

Voltage input to set output current (IL2) of current source 2.

Connect load resistor between this pin and GND for IL2 setting.

Connect load resistor between this pin and GND for IL3 setting.

Leave this pin open if IL3 is not used.

Laser turns on and off by “L” and “H”, respectively.

Connect resistor between pins 1RM and 2RM for conversion of

current generated by monitoring photodiode into changes in voltage.

Analog output for monitoring laser power

Comparator output for monitoring laser power

If this is “L”, all current supply circuits are turned off.

Connect load resistor between RO and VCC for laser current.

Power supply for internal analog circuits. Connect to positive power

source (+5V)

Power supply for internal digital circuits. Connect to positive power

source (+5V)

GND for internal analog circuits

GND for internal digital circuits

2

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