m66515fp Renesas Electronics Corporation., m66515fp Datasheet

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m66515fp

Manufacturer Part Number
m66515fp
Description
Laser Diode Driver/controller
Manufacturer
Renesas Electronics Corporation.
Datasheet

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M66515FP
Laser Diode Driver/Controller
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
Applications
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 C
reference voltage to the V
The PD current occurring when a LD emits light flows through a resistance connected across 1RM and 2RM, resulting
in a potential difference (V
current source from the C
C
This operation is performed when the S/H input is "L" (sample); when the S /H input is in the "H" state, the C
the high-impedance state (hold), regardless of V
The LD driving current consists of a switched current I
current which is independent of the DATA input state.
Rev.1.00, Sep.22.2003, page 1 of 11
H
pin causes the charge on the external capacitor to be discharged.
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
Equipment employing semiconductor laser diodes
H
r
M
pin.
pin flows to charge the external capacitor. When V
). This V
M
is compared with the voltage applied to the V
M
, V
r
and the DATA input state.
SW
, which is controlled by the DATA input, and I
M
>V
r
, a constant current sink from the
r
pin, and when V
H
REJ03F0084-0100Z
pin and applying a
M
<V
B
, a LD bias
Sep.22.2003
r
, a constant
H
Rev.1.0
pin is in

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m66515fp Summary of contents

Page 1

... M66515FP Laser Diode Driver/Controller 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 stem in which the semiconductor laser diode anode and monitoring photo diode cathode are connected to the stem. ...

Page 2

... M66515FP Pin Configuration (top view) Description of Pin Pin name Name LD Laser current output PD Monitor diode input R Switching current setting load S output R Bias current setting load B output V Bias current setting voltage B input DATA Switching data input 1RM, 2RM Load input for monitoring ...

Page 3

... M66515FP Block Diagram Explanation of operation 1. Laser driving current values The values of the laser driving currents I capacitor connected to the C pin. H (1) I (switched current) SW Here -1 (max) =120 mA, and GND (2) I (bias current) B Here -2 (max) =30 mA, and ...

Page 4

... M66515FP 5. RO pin The RO pin is connected to the laser driving current load resistance; current essentially equal to I The load resistance is connected between this pin and V reduced. However, the circuit operation requires that the voltage at this pin be 2 above. Hence if the maximum value of ...

Page 5

... M66515FP 7. V and GND pins CC The V 1 and V 2 pins and the GND1 and GND2 pins are related to the power supply. The internal circuitry CC CC connected to these pins is as follows GND1: Connected to analog circuitry GND2: Connected to digital circuitry CC The following should be taken into account in designing the actual wiring. ...

Page 6

... M66515FP Absolute Maximum Ratings Symbol Parameter V Power supply voltage CC V Input voltage CH DATA, ENB, S/H V Output voltage Switching current SW I Bias current B Pd Power dissipation Tstg Storage temperature Note: When Ta 25°C, derating at 9.6 mW/°C should be performed. Recommended Operating Conditions ...

Page 7

... M66515FP Electrical Characteristics Sym- Parameter bol DATA, ENB, S/H V "H" input IH voltage DATA, ENB, S/H V "L" input voltage IL Vr Reference Vr voltage input Vref Reference Vref voltage output Temperature coefficient V Operating LD LD voltage range V Effective voltage upper limit V "H" output ...

Page 8

... M66515FP Switching Characteristics Symbol Item Measurement pin Input f Operating OP frequency t Circuit response C voltage RP1 H time 1 t Circuit response PD current RP2 time 2 S/H voltage t Circuit response RP3 time 3 ENB voltage t Circuit turn-on ON time ENB voltage t Circuit turn-off OFF time Note 1. Measurement circuit and Timing chart Rev ...

Page 9

... M66515FP Note 2. Measurement circuit and Timing chart Note 3. Measurement circuit and Timing chart Rev.1.00, Sep.22.2003, page ...

Page 10

... M66515FP Note 4. Measurement circuit and Timing chart Application example Rev.1.00, Sep.22.2003, page ...

Page 11

... M66515FP Package Dimensions Rev.1.00, Sep.22.2003, page ...

Page 12

Sales Strategic Planning Div. Keep safety first in your circuit designs! 1. Renesas Technology Corp. puts the maximum effort into making semiconductor products better and more reliable, but there is always the possibility that trouble may occur with them. Trouble ...

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