Digital Servo DSP with On-Chip RF Amplifier Developed
CD player servo processing and decoding integrated on a single
The popularity of music has resulted in the widespread use of a wide range of audio media, such as
cassette tape, CD, and MD. Recently, the consumer’s options have expanded to include products that
use semiconductor memory as the storage medium.
Still, the CD, with an annual worldwide market of 120 million units, remains the most popular format
and is expected to retain its lead for the near future.
Since the CD player represents a mature market, particular aspects are desired in the components used
in these products. The main desired properties are (1) the ability to provide stable performance for
easy development of end products (In particular, this means reducing both the time and the number of
employees required for end product development.) and (2) a small total parts count to improve relia-
bility, to reduce manufacturing and parts costs and to increase production efficiency.
To respond to these needs, Sanyo has now developed the LC78645E super system-on-chip servo CD
DSP that integrates an RF amplifier on the same chip.
Until now, even though a digital servo CD DSP has been used, CD players have required a separate
bipolar IC to provide the required RF amplifier. Thus the main signal processing for CD playback has,
until now, required a two-chip structure consisting of this bipolar IC and the CD DSP that handles the
servo and digital later signal processing. The LC78645E is a super system-on-chip CD DSP that incor-
porates bipolar IC technology onto the MOS IC itself.
Use of the LC78645E allows both the parts count and the number of manufacturing steps to be
reduced, and to increase end product reliability as a result. Furthermore, servo development support
software can now be used to verify servo characteristics on a personal computer, an operation that had
been extremely time consuming up to now.
• Playback functions
— Audio CD playback (standard, 2×, and 4× speeds)
SANYO Electric Co., Ltd. Semiconductor Company Overseas Marketing Division
TOKYO OFFICE: Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN