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NJW4702

3ch Laser Diode Driver

s

GENERAL DESCRIPTION

NJW4702

is a laser diode driver for the operation of a grounded

laser diode for CD-R and CD-RW drivers.

It includes three channels current amplifiers for three different

optical power levels. Reference inputs are voltage input, and

voltage control is possible without external resistors. An on-chip RF

oscillator is provided to reduce laser mode noise during read mode.

Oscillation frequency and oscillation amplitude are defined by two

external resistors.

s

FEATURES

q

Operating Voltage

4.5V to 5.5V

q

On-chip RF Oscillator

200MHz to 500MHz

q

Rise-time/Fall-time

1.0ns typ.

q

Maximum Output Current 250mA typ.

q

Bi-CMOS Technology

q

Package Outline

PCSP16(3.5mm 0.65mm pitch)

s

BLOCK DIAGRAM

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PACKAGE OUTLINE

NJW4702SE8

IOUT

12

GND

11

RAMP

10

ENABLE

9

H:ON

VCC2 13

H:ON

L:ON

L:ON

8 OSCEN

GND 14

OSC

BIAS

7 VCC1

GND 15

6 GND

VINR 16

5 OUTEN3

1

RFREQ

2

VIN2

3

VIN3

4

OUTEN2

Ver.1

-1-

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