2004 May 04

3

Philips Semiconductors

Preliminary specification

Photodiode and amplifier IC

for CD and DVD applications

TZA1046

1

FEATURES

• High frequency RF amplifiers

• Power-down mode for standby condition

• Suitable for all CD (785 nm) and DVD (655 nm)

read/write applications

• Four high-bandwidth central outputs (A, B, C and D);

four satellite outputs (EG, FH, ETST and HTST) and one

high-bandwidth differential RF output (RFP and RFN)

• Internal current clamp and current fold back (power

reduction)

• Versatile programmable gain switches (CD/DVD, H/L

and R/W)

• Single 5 V supply

• Current outputs for optimum signal transport over flex

cable

• Small outline package HTSSON16T with good

positional tolerance.

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APPLICATIONS

• CD and DVD read/write applications.

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GENERAL DESCRIPTION

The TZA1046 is a single optical pick-up IC for read/write

systems and is suitable for CD and DVD applications.

The device contains eight RF amplifiers for the central and

satellite diodes and one differential RF amplifier (RFP and

RFN) which handles the sum of the four A, B, C and D

central diode signals.

Programming the gain is a very versatile way to optimize

interfacing between the TZA1046 and the preamplifier.

The gain can be programmed for CD or DVD media with

the gain switch CD/DVD.

The H/L switch is a three level switch that can be used to

adjust the gain for different dye and phase change media.

The third level (high-impedance state) invokes the

power-down mode for standby condition.

Gain switch R/W is used to reduce the gain during writing.

During CD-R writing with clipping, the high peak signals for

the central and satellite segments are clamped internally

and the output currents of the A, B, C, D, E, F, G and H

segments are folded back to reduce power consumption.

The output currents can be folded back to almost zero,

depending on the light power detected. CD-R writing can

also be done without clipping for applications where

averaging is used.

All outputs are current outputs that can supply a maximum

of 8 mA. In CD-R write clip mode, the clipping level of the

output currents is between 5 mA and 8 mA.

The HTSSON16T package has a low spread on the

Z tolerance. The Z tolerance is measured between the

diodes (chip surface) and the bottom of the leads. The

diodes have an offset of 54

µm the y direction with respect

to the leadframe centre and a tolerance of 50

µm in both

x- and y-directions.

In normal operation the satellite outputs F and H are

combined as one output FH and the satellite outputs

E and G are combined as one output EG. In normal mode

the ETST and HTST outputs are not used (high ohmic).

When pulling the R/W pin above the supply or is left open

the device comes into a testing mode where all four

separate satellite channels are directed to the outputs.

This mode is used for Optical Pick-up Unit (OPU)

alignment of the diodes where all satellite channels must

be available.

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ORDERING INFORMATION

TYPE

NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

TZA1046TM

HTSSON16T plastic thermal enhanced thin shrink small outline package/transparent;

no leads; 16 terminals; body 6.6

× 5.2 × 1.1 mm

SOT814-1