M66510 Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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M66510

LASER-DIODE DRIVER

MITSUBISHI ELECTRIC  

MITSUBISHI 〈DIGITAL ASSP〉

M66510P/FP

LASER-DIODE DRIVER

FUNCTION

The 66510 is a semiconductor laser diode driver that drives a

semiconductor laser of the type (our R type) whose cathode

and the anode of monitor photodiode are connected to the

stem. Using the R type laser allows direct fixing the laser on

a device for easy installation, thus improving its radiation effi-

ciency.

Laser driving current is set by applying voltage from outside.

The M66510 is equipped with two independent voltage ap-

plying pins to provide higher accuracy of setting the current

value.

It is also equipped with a laser current forced off pin to pre-

vent overcurrent from flowing into the laser diode at the

power-ON time.

For detection of laser power, the monitor current of monitor

photodiode built in the laser is converted into voltage by an

external resistor to generate an analog output, and simulta-

neously the result of comparison with the internal reference

voltage is output as TTL-level logic information.

PIN DESCRIPTIONS

Pin name

Name

LD

Laser connecting pin

PD

Monitor diode connecting pin

VL1

Voltage input pin for IL1 setting

1RC

Load resistor connecting pin for IL1

setting

VL2

Voltage input pin for IL2 setting

2RC

Load resistor connecting pin for IL2

setting

3RC

Load resistor connecting pin for IL3

setting

DATA

Switching data input pin

1RM,

2RM

Monitor load resistor connecting pin

MO

Monitor analog output pin

CO

Monitor comparator output pin

VOFF

Laser current forced off input pin

1RO

Load resistor connecting pin for laser

current IL1

2RO

Load resistor connecting pin for laser

current IL2/IL3

CD

Duty compensating capacitor

connecting pin

VCC1

Power supply pin 1

VCC2

Power supply pin 2

GND1

GND2

GND pin 1

GND pin 2

Function

Connects the anode of semiconductor laser diode.

Connects the cathode of monitor photodiode.

Voltage input for setting the output current (IL1) of current source 1.

Connects IL1 setting load resistor between the pin and GND.

Voltage input for setting the output current (IL2) of current source 2.

Connects IL2 setting load resistor between the pin and GND.

Connects IL3 setting load resistor between the pin and GND. If IL3 is not used,

open the pin.

Turns on the laser in the “L” position, and off in the “H” position.

Connects between 1RM and 2RM the load resistor for converting monitor

photodiode current into voltage.

Analog output for monitoring laser power.

Comparator output for monitoring laser power.

Turns off all current source circuits in the “L” position.

Connects load resistor for laser current IL1 between 1RO pin and VCC.

Connects load resistor for laser current IL2 and IL3 between 2RO pin and VCC.

Connects duty compensating capacitor of optical output switch waveforms

between the pin and GND. If duty compensation is not required, open the pin.

Power supply for internal analog circuits. Connected to positive power supply

(+5V).

Power supply for internal digital circuits. Connected to positive power supply

(+5V).

GND for internal analog circuits.

GND for internal digital circuits.

2

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