cxa2635am Sony Electronics, cxa2635am Datasheet

cxa2635am

Manufacturer Part Number

cxa2635am

Description

Dvd Player Photodetector Ic Pdic Supports Two-wavelength Laser Diodes

Manufacturer

Sony Electronics

Datasheet

1.CXA2635AM.pdf (2 pages)

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The CXA2635AM provides individual

photodetector areas for CD and DVD on

the same chip, and thus can support 110

DVD) laser diodes. (See figure 1.) This

allows a DVD player optical pickup to be

implemented with the absolute minimum

number of components.

The CD and DVD photodetector areas

have a spacing on the chip of 112.5 m,

which is different from the laser diode

beam pitch of 110 m. This is because the

refractive index of the half mirror is dif-

ferent for the CD laser wavelength (780

nm) and the DVD laser wavelength (650

nm). This 2.5 m of displacement in the

photodetector area positions allows the

DVD Player Photodetector IC (PDIC) Supports Two-Wavelength Laser Diodes

CXA2635AM

The DVD is no longer a new or unusual medium. We are now in an

age when anyone who wants to can enjoy DVDs in their own home,

and the market is moving from the stage where market penetration

is an issue to a period where growth is an issue.

Sony has now developed a photodetector IC (PDIC) that can form a

DVD player optical pickup with a minimal number of components.

m beam pitch two-wavelength (CD/

We developed this optical device

for DVD players by taking the

maximum possible advantage of

the technologies created during

S o n y ’ s w o r k o n C D a n d M D

devices. Although I found this a

challenging project, not only in the

circuit design but also the chip

internal device layout as well, I

learned a lot and it forced me to

grow as an engineer. This is an IC

I won’t forget.

PDIC that Supports Two-

Wavelength (CD and DVD)

Laser Diodes

CXA2635AM to form a CD/DVD system

in conjunction with a two-wavelength la-

ser diode with a 110 m beam pitch.

In the CXA2635AM, the CD signal and

the DVD signal are output from the same

pin. This pin functions as a switch that

allows the output to be selected. (A high

level selects CD mode and a low level

selects DVD mode.)

Built-in Media Switch

Supports two-wavelength (CD and

DVD) laser diodes

Supports 8-speed CD and 6-speed

DVD playback

Built-in media switch

Miniature transparent 12-pin molded

package

This new device provides the following

i m p r o v e m e n t s o v e r t h e e a r l i e r

CXA2635M and thus is an easy-to-use

device that responds to customer needs.

•Reduced sample-to-sample variations in

Sony has succeeded in reducing the ac-

tual value of the sample-to-sample varia-

tions to one half of previous levels. This

can provide improved pickup performance

and productivity for end product manufac-

turers.

•Improved resistance to ESD

This device also features the ability to

withstand electrostatic voltages of up to

200 V. This can contribute to a reduction

in destruction of devices by electrostatic

discharge during handling.

the offset voltage

Improvements Over the

Earlier CXA2635M

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cxa2635am Summary of contents

Page 1

... CXA2635AM to form a CD/DVD system in conjunction with a two-wavelength la- ser diode with a 110 m beam pitch. Built-in Media Switch In the CXA2635AM, the CD signal and the DVD signal are output from the same pin. This pin functions as a switch that allows the output to be selected. (A high level selects CD mode and a low level selects DVD mode ...

Page 2

... A B/b C Figure 2 CXA2635AM Block Diagram 100 degrees Package E center 100 126 126 Package center Figure 4 Photodetector Pattern Dimensions 12 GND GND 7 F (Unit: m) ...

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