TDA1302T datasheet(13/18 Pages) PHILIPS

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TDA1302_1

14 Wed Sep 14 13:30:56 1994

September 1994

Philips Semiconductors

Preliminary speciﬁcation

Data ampliﬁer and laser supply circuit for

CD player and read only optical systems

TDA1302T

Application of other mechanisms

The TDA1302T can accommodate all laser/monitor

configurations with an N sub-laser diode. When an N

sub-monitor diode is used, external circuitry is required as

illustrated in Figs 11(a) to 11(d). Most of these

laser/monitor diode units have a variable resistor (Rm) in

parallel with the monitor diode which has been

pre-adjusted so that the voltage drop across this resistor

has a specific value at nominal laser diode output power.

The four circuits given each detail specific values for some

frequently used pick-up units as given in Table 3. Each

circuit has its own advantages. All circuits illustrated make

use of the fixed voltage (<200 mV) across the built-in

monitor resistor.

Table 3 Pick-up units.

PICK-UP

UNIT

MANUFACTURER

APPLICATION

SLD104U

Sony corporation

KSM210 (Sony)

LT022MS

Sharp corporation

KSM210 (Sony)

RLD-78MA

Rohm corporation

KSM210 (Sony)

HOP-M3TR

(Hitachi)

SF91

Sony corporation

CDV90V1 (Sanyo)

Fig.11 Applications of the laser/monitor units.

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