Sanyo Electric LC78637E
The LC78637E combines audio CD RF signal processing, servo control, EFM signal processing, audio signal processing, and a CDTEXT decoder in a single chip, enabling a system to be configured with very few peripheral components. The RF signal processing block performs such functions as EFM signal generation, error signal generation, and laser power control. The servo control block carries out A/D conversion of focus error and tracking error signals from the RF signal processing block, and digitally performs focus, tracking, sled, and spindle servo processing necessary for CD servo operation.
| Part No. |
LC78637E |
| Datasheet |
LC78637E
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| Manufacturer |
 Sanyo Electric |
| Description |
CMOS IC |
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APPLICATIONS
The functions of the EFM signal processing block cover EFM signal demodulation and synchronization detection, protection, and interpolation, de-interleaving, and error detection and correction. The audio signal processing block handles data interpolation/mute processing based on the error correction situation, and incorporates an 8X over sampling filter, 1-bit DAC, and secondary LPF (differential amplifier). The status and characteristics of each function block can be set, or ascertained by data reads, via the microcomputer interface. Playback functions — Playback speed: 1X speed, 2X speed — Jitter-free playback (VCEC) — CD-R/W: 1X speed, 2X speed — Simple CLV playback RF processing block — RF system: AGC, CD-R, R/W playback supported, peak hold, bottom hold — Error system: Variable-balance TE signal generation, FE signal generation — Detection: Track counting signal, jitter, flaws (black, mirror) — Laser power control — DC offset voltage cancellation Servo control b...
