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參數(shù)資料
| 型號： | LC78647NT |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | 14 X 14 MM, TQFP-100 |
| 文件頁數(shù)： | 1/17頁 |
| 文件大?。?/td> | 175K |
| 代理商： | LC78647NT |
Overview
The LC78647NT combines an anti-shock control function, audio CD RF signal processing, servo control,
EFM signal processing, and audio signal processing 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. 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. Low-power-dissipation operation is achieved through the use of jitter-free playback and simple
CLV playback.
Playback functions
— CLV playback (1X speed, 2X speed)
— Jitter-free playback
— Simple CLV playback (max. 3X speed)
RF processing block
— RF system: AGC, CD-R, R/W playback supported, RF peak and bottom level detection
— Error system: Variable-balance tracking error signal generation, focus error signal generation
— Detection: Track detection in the event of flaws, jitter, or track jumping
— Laser power control
Servo control block
— Digital processing of tracking, focus, sled, and spindle servos
— Automatic adjustment functions: Focus gain, focus bias, focus offset, tracking gain, tracking offset,
tracking balance
— Shock detection
— Interruption detection
EFM processing block
— Error detection and correction (C1 = twofold, C2 = twofold)
— DOUT output
— Jitter margin: ± 13 frames
— EFM signal synchronization detection, protection, interpolation
Audio processing block
— Interpolation (4 interpolations)
— Digital attenuator
— Built-in de-emphasis filter
— 1-bit DAC (tertiary Σ noise shaper system)
— Built-in 8× oversampling digital filter
— Anti-leak sound function
— Bus boost function
— Fadeout function
— Bilingual function
— Built-in secondary LPF for audio output
— DF and DAC clocks can be supplied externally
— Max. 46-second sound skipping prevention
(when using 16 M) through LD-ADPCM 4-bit
compression/decompression processing
CMOS IC
for Compact Disc Player Applications
LC78647NT
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