M66515FP

Rev.1.00, Sep.22.2003, page 2 of 11

Pin Configuration (top view)

Description of Pin

Pin name

Name

Function

LD

Laser current output

Connected to the semiconductor LD cathode

PD

Monitor diode input

Connected to the monitor PD anode

Switching current setting load

output

Bias current setting load

output

used, this pin should be left open.

Bias current setting voltage

input

is not used, this pin should be left open.

DATA

Switching data input

1RM, 2RM

Load input for monitoring

Connect a load resistance to convert the monitor PD current to a voltage

across 1RM and 2RM

ENB

Laser current enable input

When "H", all current source circuits are turned off

RO

Laser current load output

S/H

Sample hold control input

When "L", sample (APC) operation is performed; when "H", hold

(switching) is performed

CH

Hold capacitor load

input/output

Connect a hold capacitor between this pin and GND. This pin is connected

input.

Vref

Reference voltage output

Output pin for the M66515 internal reference voltage (1.2 V typ)

Vr

Reference voltage input

A reference voltage is applied to cause operation of the comparator within

the sample hold circuit. When using the reference voltage within the

TEST

Test pin

Pin used for testing at time of shipment of the M66515; should be left open

Power supply pin 1

Power supply for the internal analog system; connect to a positive power

supply (+5 V)

Power supply pin 2

Power supply for the internal digital system; connect to a positive power

supply (+5 V)

GND1

GND pin 1

GND for internal analog system

GND2

GND pin 2

GND for internal digital system