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Optical Pickup Chipset with Photodetector PDIC for Blue-Violet Laser Diodes
CXA2674EM
CXA2673EM
The age of the blue-violet laser diode has arrived
making even higher recording densities possible.
Sony has now developed a new photodiode semi-
conductor wafer process and a new package for
photodetector IC for use with blue-violet laser
diodes.
This article introduces a chipset for use with blue-
violet laser diodes; a chipset that concentrates the
industry’s leading technologies in a unified system.
CXA2674EM
The CXA2674EM is a photodetector IC
(PDIC) that detects both RF and servo
signals and mounted in a record/playback
optical pickup that supports the blue-vio-
let laser diode used for Blu-ray and other
optical discs. This device is fabricated in
a leading-edge process that improves the
optoelectronic conversion characteristics
in the blue-violet wavelength range to
almost the theoretical limits. It also
achieves a high signal-to-noise ratio by
including a low-noise amplifier. This
device features a standby mode function
that allows power consumption to be
minimized when the device is not being
VOICE
No rose without a thorn.
While the blue laser diode was a
miraculous development, and it is
an extremely attractive device, it
was not easy to develop a PDIC
that could receive that light. Revis-
ing the fabrication process was, of
course, necessary, and we even
developed a new package in creat-
ing this new product! This is a very
friendly product and can be used
by almost anyone. It’s good to be
able to relax again now that this
project is done.
operated. (Operating mode: 30 mA,
standby mode: 2 mA) This product is pro-
vided in a newly-developed package that
is appropriate for photodetection in the
wavelength range of the blue-violet laser.
CXA2673EM
The CXA2673EM is a photodetector IC
(PDIC) developed for use as a laser power
monitor and mounted in a record/playback
optical pickup that uses the blue-violet
laser diode used for Blu-ray and other
optical discs. This device adopts the same
leading-edge process used for the
CXA2674EM and the same package. It
provides excellent performance as a front
monitor for blue-violet laser diodes.
Newly-Developed Package
for Blue-Violet Laser Diodes
Sony has developed a new cavity mold
glass sealed package for blue-violet laser
diodes. Conventional transparent plastic
packages have low transparency in the
wavelength range of the blue-violet laser
diode, and furthermore, it has been shown
that long-term exposure to blue-violet la-
ser diode light degrades plastic package
material. Therefore, Sony developed this
new package that mounts the silicon chips
in a molded cavity area and seals them in
that area with glass that has antireflection
coating on both sides, thus resolving both
these problems.
CXA2674EM
RF/Servo PDIC for blue-violet laser diodes
I
Includes a high-sensitivity photodiode (0.3 A/W at 405 nm)
I
Low-noise amplifier
I
Standby mode function
I
Cavity mold glass sealed small package
CXA2673EM
Laser front monitor PDIC for blue-violet laser diodes
I
Two-channel structure (Vin1, Vin2)
I
Standby mode function
I
Cavity mold glass sealed small package
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