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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 60x or higher and DVD-ROM drives with read speeds of up to 12x. 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 s s s Ultrahigh speed: 100 MHz Low noise: -87 dBm (@54 MHz) On-chip summing amplifier Miniature transparent molded package (SOP)
The CXA2586M is a photodetector IC (PDIC) used as the optical pickup in CD-ROM and DVD-ROM drives.
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 voltage 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 32x speed CD-ROM drive, and to add a voltage amplifier in a later stage to acquire the required output voltage (24 mV/ W). 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 maintaining 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 playback even for CD-RW and similar technologies that produce only faint signals. It goes without saying that this summing amplifier has a bandwidth of 100 MHz and supports ultrahigh-speed playback.
Ultrahigh Speed
By adopting the newly-developed P-42B*1 ultrahigh-speed high integration density bipolar process, the CXA2586M achieves a bandwidth of 100 MHz and thus can support 12x speed DVD-ROM drives.
*1 See Sony Cx-News Vol. 16 (pages 8 to 13) for more information on the P-42B process.
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When I started working for Sony, 8x speed was thought to be the fastest CD-ROM drives that would ever become, so we designed a PDIC that would support 8x speed playback. But, as you know, CDROM drives have already reached 48x speed. Now, hoping that we finally have an idea what the ultimate product will be, we have developed a PDIC with a 100 MHz bandwidth. This PDIC will support some amount of increased playback speed. I hope you will try using it in your designs.
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Disc
0
Objective lens Gain [dB] Beam splitter Grating
-2 -4 -6 -8 1M 3M 5M 7M 10M 30M 50M 70M100M 300M
Frequency [Hz]
s Figure 4-1 A to D Frequency Response
Laser diode
2 0 -2
CXA2586M
Gain [dB]
s Figure 1 Sample Optical Pickup Structure
-4 -6 -8
Fo
10
VCC
VC
GND
Eo
1M
3M
5M 7M 10M
30M 50M 70M100M
300M
9
8
7
6
Frequency [Hz]
s Figure 4-2 RF Frequency Response
REF -55 dBm 5 dB/
Ao Bo Co Do
-70 dBm RBW 30 kHz
VREF
1
Do
2
Ao
3
RF
4
Bo
5
Co
VBW 30 Hz -100 dBm 0 60M 120M
s Figure 2 Block Diagram
Frequency [Hz]
s Figure 5-1 A to D Noise Characteristics
124 22
88 F D 200 120 A B C E
REF -55 dBm 5 dB/
-70 dBm RBW 30 kHz VBW 30 Hz -100 dBm
6 deg.
(Unit: m)
0
60M
120M
Frequency [Hz]
s Figure 3 Optical Pickup Pattern Dimensions
s Figure 5-2 RF Noise Characteristics

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