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CXA2586 데이터시트(PDF) 1 Page - Sony Corporation

부품명 CXA2586
상세설명  Ultrahigh-Speed (100 MHz) Photodetector IC
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제조업체  SONY [Sony Corporation]
홈페이지  http://www.sony.co.jp
Logo SONY - Sony Corporation

CXA2586 데이터시트(HTML) 1 Page - Sony Corporation

  CXA2586 Datasheet HTML 1Page - Sony Corporation CXA2586 Datasheet HTML 2Page - Sony Corporation  
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Ultrahigh-Speed (100 MHz) Photodetector IC
for CD-ROM and DVD-ROM Players
CXA2586M
Sony has created a photodetector IC product for use as the optical
pickup in CD-ROM and other optical disc drives. This device (the
CXA2586M) achieves the industry’s highest performance: a bandwidth
of 100 MHz.
The CXA2586M supports CD-ROM drives with read speeds of 60
× or
higher and DVD-ROM drives with read speeds of up to 12
×.
A newly developed ultrahigh-speed photo IC process (P-42B) was
adopted, allowing the CXA2586M not only to achieve higher speeds,
but also to achieve a noise level reduced by –6 dB from conventional
products.
s
Ultrahigh speed: 100 MHz
s
Low noise: –87 dBm (@54 MHz)
s
On-chip summing amplifier
s
Miniature transparent molded
package (SOP)
The CXA2586M is a photodetector IC
(PDIC) used as the optical pickup in
CD-ROM and DVD-ROM drives.
Ultrahigh Speed
By adopting the newly-developed
P-42B*1 ultrahigh-speed high integra-
tion density bipolar process, the
CXA2586M achieves a bandwidth of
100 MHz and thus can support 12
×
speed DVD-ROM drives.
*1 See Sony Cx-News Vol. 16 (pages 8 to 13) for
more information on the P-42B process.
Low Noise
While bandwidth is important, the noise
characteristics are also crucial for
PDICs. The main function of the PDIC
internal circuits is to convert an
extremely faint current signal to a volt-
age signal. This function is called an
I-V amplifier. With conventional PDIC
technology, it was necessary to restrict
the gain of the I-V amplifier to a low
level to achieve a bandwidth of about
50 MHz, which corresponds to a 32
×
speed CD-ROM drive, and to add a volt-
age amplifier in a later stage to acquire
the required output voltage (24 mV/
µW). This approach has the problem
that the noise is amplified along with
the signal by the voltage amplifier later
in the circuit. Since the P-42B process
used in this device features an extremely
high potential, it was possible to extend
the bandwidth to 100 MHz while main-
taining the required output voltage with
just a single I-V amplifier stage. Thus
the noise level was reduced by –6 dB
as compared to earlier devices.
On-Chip Summing
Amplifier
CD-ROM and other optical disc systems
detect the 0/1 states in the pit signal (i.e.
generate the RF signal) by summing the
four channel outputs (A to D) from the
PDIC, which generates the focus error
signal. The CXA2586M integrates a
four-channel summing amplifier on the
same chip for channels A to D. Since
there is no need for external summation,
the CXA2586M can provide clear play-
back even for CD-RW and similar tech-
nologies that produce only faint signals.
It goes without saying that this summing
amplifier has a bandwidth of 100 MHz
and supports ultrahigh-speed playback.
VOICE
When I started working for Sony,
8
× speed was thought to be the
fastest CD-ROM drives that would
ever become, so we designed a
PDIC that would support 8
× speed
playback. But, as you know, CD-
ROM drives have already reached
48
× speed. Now, hoping that we
finally have an idea what the ulti-
mate product will be, we have de-
veloped a PDIC with a 100 MHz
bandwidth. This PDIC will support
some amount of increased play-
back speed. I hope you will try
using it in your designs.


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