cxa2636n Sony Electronics, cxa2636n Datasheet

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cxa2636n

Manufacturer Part Number
cxa2636n
Description
Manufacturer
Sony Electronics
Datasheet
becoming increasingly fierce. Recently, the arena for this competition
has shifted from playback performance to write performance, and write
speeds are fast catching up with read speeds.
speed write. This device takes full advantage of the P-42B process,
which has a two and one half year volume production track record, as
an ultrahigh-speed photodiode IC fabrication process.
in the industry and aims at deployment in DVD recording.
a full product line of photodetector devices for optical disc recording
systems.
CXA2636N/CXA2637N
the photodetector ICs (PDIC) that de-
tect light reflected from the disc. The
CXA2636N and CXA2637N only dif-
fer in the size of the photoreceptor area,
and have patterns that expect the corre-
sponding limited and unlimited optical
systems.
increased the pulse response speed as
shown in table 1.
Photodetector (PDIC) for CD-R/RW Achieves 32 -Speed CD-R Write Performance
CXA2636N, CXA2637N, CXA2632EM
The competition to provide even higher speeds in optical disc drives is
Now, Sony has developed a photodetector IC (PDIC) that supports 32 -
Sony has perfected a product that has characteristics at the top level
Sony has also developed a new laser front monitor, and has achieved
The CXA2636N and CXA2637N are
To achieve 32 -speed write, Sony has
V
20
designing several custom ICs
every month to respond to
specific customer needs. Not
only does this involve designing
all the circuits, but it even
extends to taking detailed care
over individual transistor and
other device layout. I am confi-
dent that this level of care means
that these ICs will fully satisfy
our customers’ needs. Since I
will be developing high-perfor-
mance products, I strongly rec-
ommend that you try these ICs
in your products.
Recently, I have been very busy,
Response Speed
O
I
C
E
These devices include a 9 dB gain
switching function to allow them to both
avoid output saturation when a high-
power laser is used and to assure an
adequate signal-to-noise ratio during
playback.
These devices retain the low noise
which is a feature of Sony PDIC prod-
ucts by forming the I-V amplifier (cur-
rent to voltage conversion circuit) as a
single stage and by adopting a technique
in which the transimpedance is switched
by switching the gain. Also, since these
ICs provide an RF output (the summed
output of the A to D main beam signals),
they make it possible to reproduce the
faint signals from CD-RW and other
formats clearly.
Since these devices retain the body size
of the conventional 12-pin package
while providing 14 pins, they allow the
size of the optical pickup to be main-
tained. Furthermore, these devices take
mounting simplification into consider-
ation by adopting a surface mounting
type (the so-called “gull wing” form) for
the lead geometry. Note that this pack-
age can withstand reflow soldering, al-
though certain conditions do apply.
Low Noise
Miniature Transparent
Gain Switching Function
Molded Package
CXA2632EM
The CXA2632EM is a laser diode
power monitor (front monitor) PDIC.
The CXA2632EM adopts a newly-
developed ultraminiature COB (chip on
board) package, and since it includes a
built-in power supply decoupling
capacitors, it can contribute to reduc-
ing the mounting area. This package
also supports reflow soldering.
Since this device has a response time of
20 ns (maximum), it is more than
adequate for 32 -speed write drives.
This device achieves an output dynamic
range of 2.8 V (typical) when Vref is
3.0 V due to a new circuit type.
COB Package
Response Speed
Wide Dynamic Range
Supports 32 -speed write CD-R
Includes a gain switching func-
tion (9 dB)
Low noise (–88 dBm during play-
back for the A to D signals)
Built-in RF output (sum of the A
to D signals)
Miniature transparent 14-pin sur-
face mounting type (gull wing)
molded package

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cxa2636n Summary of contents

Page 1

... CXA2636N/CXA2637N The CXA2636N and CXA2637N are the photodetector ICs (PDIC) that de- tect light reflected from the disc. The CXA2636N and CXA2637N only dif- fer in the size of the photoreceptor area, and have patterns that expect the corre- sponding limited and unlimited optical systems ...

Page 2

... Vcc Figure 2 CXA2636N/CXA2637N Block Diagram Table 1 Pulse Response Speed Main signal Slew rate 350 V/ s (Typ.) Settling time 10 ns (Typ.) Sub-signal Slew rate 150 V/ s (Typ.) Settling time 15 ns (Typ.) 4 Vcc 0.1 F ...

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