M66515FP データシートの表示（PDF） - Renesas Electronics

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M66515FP

Laser Diode Driver/Controller

Renesas Electronics 

M66515FP

Laser Diode Driver/Controller

REJ03F0084-0100Z

Rev.1.0

Sep.22.2003

Description

The M66515 is a laser diode driver/controller that performs drive and controls the laser power control of a type of

semiconductor laser diode the anode of which is connected, with the cathode of a photodiode for monitoring, to a stem

in which the semiconductor laser diode anode and monitoring photo diode cathode are connected to the stem.

This IC has a sink-type laser driving current output pin, and can drive a laser diode with a bias current of up to a

maximum 30 mA and with switched currents of up to 120 mA, switched at rates of up to 40 Mbps.

The IC incorporates a sample hold circuit, so that a self-APC (Automatic Power Control) system, which does not

require external laser power control, can be realized.

Features

• Internal sample-and-hold circuit for self-APC configuration

• High-speed switching (40 Mbps)

• High driving currents (150 mA max)

• Settable bias current (30 mA max)

• Single 5 V power supply

Applications

• Equipment employing semiconductor laser diodes

Function Overview

The M66515 is a laser diode driver/controller which drives and controls the laser power of a semiconductor laser diode

(LD) the anode of which is connected, with the cathode of a photodiode (PD) for monitoring, to a stem (among

Mitsubishi lasers, N type models).

LD driving and laser power control are executed by connecting an external capacitance to the CH pin and applying a

reference voltage to the Vr pin.

The PD current occurring when a LD emits light flows through a resistance connected across 1RM and 2RM, resulting

in a potential difference (VM). This VM is compared with the voltage applied to the Vr pin, and when VM<Vr, a constant

current source from the CH pin flows to charge the external capacitor. When VM>Vr, a constant current sink from the

CH pin causes the charge on the external capacitor to be discharged.

This operation is performed when the S/H input is "L" (sample); when the S /H input is in the "H" state, the CH pin is in

the high-impedance state (hold), regardless of VM, Vr and the DATA input state.

The LD driving current consists of a switched current ISW, which is controlled by the DATA input, and IB, a LD bias

current which is independent of the DATA input state.

Rev.1.00, Sep.22.2003, page 1 of 11

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