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CXA2701GA датащи(PDF) 1 Page - Sony Corporation

номер детали CXA2701GA
подробное описание детали  Optical Pickup Chipset with Photodetector ICs Supports High-Speed Writing to CD and DVD
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производитель  SONY [Sony Corporation]
домашняя страница  http://www.sony.co.jp
Logo SONY - Sony Corporation

CXA2701GA датащи(HTML) 1 Page - Sony Corporation

  CXA2701GA Datasheet HTML 1Page - Sony Corporation CXA2701GA Datasheet HTML 2Page - Sony Corporation  
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VOICE
Our achievement of
×16-speed
DVD recording required pushing
our circuit technologies to the limit
to get the utmost performance
from Sony’s process technolo-
gies. The two of us on this devel-
opment team had to come up with
a lot of mutual support and en-
couragement during this design
effort. We are probably not the
only ones who are hoping that this
achievement marks the end of the
competition for ever higher
speeds.
Optical Pickup Chipset with Photodetector ICs
Supports High-Speed Writing to CD and DVD
CXA2702GA/CXA2716GA/CXA2701GA
Although it has only been a year since Sony released
the CXA2676GA and CXA2677GA* for DVD
×8-speed
recording, DVD recording speed has already reached
×16.
Sony’s newly-developed CXA2701GA and CXA2702GA/
CXA2716GA optical pickup photodetector ICs (PDICs)
support this
×16 record speed.
*: See CX-News, Volume 32, for details on the CXA2676GA and CXA2677GA.
CXA2702GA/CXA2716GA
RF/Servo PDICs
I
Supports high-speed CD/DVD write operations
(CD-R:
×52-speed, DVD-R: ×16-speed)
I
WPP1 (B+C) and WPP2 (A+D) outputs, which are
optimal for DVD address pit detection
I
Variable limiter function
I
CXA2702GA: Eight-division photodiode
CXA2716GA: Twelve-division photodiode
I
18-pin LGA COB small package
CXA2701GA
Laser Front Monitor PDIC
I
Differential output
I
Two-channel structure (Vin1, Vin2)
I
12-pin LGA COB small package
CXA2702GA/CXA2716GA
The CXA2702GA is a photodetector IC
(PDIC) that was developed as the photo-
detector for optical pickups used in
DVD
±R/RW recording drives. Like the
earlier
×8-speed CXA2677GA, it provides
the WPP1 and WPP2 signals that are
optimal for address pit signal detection.
In increasing the recording speed to
×16,
Sony added a 3
× gain switching function
to WPP1 and WPP2. The new IC thus has
an additional 2 bits of control compared
to the earlier gain switching system. The
CXA2702GA also now provides an input
pin that can control the output limiter volt-
age externally so that applications can set
the limiter voltage to provide optimal
pickup performance. Note that although
the CXA2702GA includes a built-in
8-division photodiode that supports the
same differential push-pull method as the
earlier product (CXA2677GA), Sony has
also added to the product lineup the
CXA2716GA, which includes a built-in
12-division photodiode that supports the
differential astigmatism method. Both the
CXA2702GA and CXA2716GA feature
the extremely fast main output settling
time (for a 1 V amplitude) of 6 ns.
CXA2701GA
Like the earlier
×8-speed CXA2676GA,
the CXA2701GA adopts a two-channel
structure to allow the CD laser and the
DVD laser power levels to be set individu-
ally. However, the output was changed to
the differential type in this new product.
This was because the output at the read
power became even smaller due to low-
ering the gain of the first stage I-V ampli-
fier (transimpedance amplifier) to 1/
√2 to
support
×16-speed laser diodes. Switch-
ing to a differential amplifier improves the
signal-to-noise ratio by
√2 and also allows
the common mode noise in the transmis-
sion system to be cancelled.
Support for Lead-Free
Mounting
Since the chip on board (COB) package
adopted for these ICs has excellent resis-
tance to heat, these ICs support mounting
with lead-free solder. They allow two-pass
reflow mounting with a peak temperature
of 250
°C.
Note: Since the thermal resistance is strongly
influenced by the usage environment, verify the
details of the specifications in advance, or contact
your Sony representative for consultation.


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