LC7868KE データシートの表示（PDF） - SANYO -> Panasonic

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LC7868KE

Digital Signal Processor for Compact Disc Players

SANYO -> Panasonic 

Ordering number : EN4882

CMOS LSI

LC7868KE

Digital Signal Processor for

Compact Disc Players

Overview

The LC7868KE is a CMOS LSI that implements the

signal processing and servo control required by compact

disk players, laser disks, CD-V, CD-I and related

products. The LC7868KE provides several types of signal

processing to reduce the cost of CD player units, including

demodulation of the optical pickup EFM signal, de-

interleaving and error detection and correction. It also

processes a rich set of servo system commands sent from

the control microprocessor. It can directly interface to the

dedicated serial inputs provided by the Sanyo LC78815

and LC78816 D/A converters.

Functions

• Input signal processing: The LC7868KE takes an HF

signal as input, digitizes (slices) that signal at a precise

level, converts that signal to an EFM signal, and

generates a PLL clock with an average frequency of

4.3218 MHz by comparing the phases of that signal and

a VCO output.

• Precise reference clock and necessary internal timing

generation using an external 16.9344 MHz crystal

oscillator

• Disk motor speed control using a frame phase difference

signal generated from the playback clock and the

reference clock

• Frame synchronization signal detection, protection and

interpolation to assure stable data readout

• EFM signal demodulation and conversion to 8-bit

symbol data

• Subcode data separation from the EFM demodulated

signal and output of that data to an external

microprocessor

• Subcode Q signal output to a microprocessor over the

serial interface after performing a CRC error check (An

LSB first output format can be selected.)

• Demodulated EFM signal buffering in internal RAM to

handle up to ±4 frames of disk rotational jitter

• Demodulated EFM signal reordering in the prescribed

order for data unscrambling and de-interleaving

• Error detection, correction, and flag processing (error

correction scheme: dual C1 plus dual C2 correction)

• The LC7868KE sets the C2 flags based on the C1 flags

and a C2 check, and then performs signal interpolation

or previous value hold depending on the C2 flags. The

interpolation circuit uses a quadruple interpolation

scheme. The output value is locked at zero when four or

more consecutive C2 flags occur.

• Support for command input from a control

microprocessor: commands include track jump, focus

start, disk motor start/stop, muting on/off and track

count (8-bit serial input)

• Built-in digital output circuits.

• Arbitrary track counting to support high-speed data

access

• Zero cross muting

• D/A converter input signal outputs with output data

continuity improved by 4× oversampling and digital

filtering

• Supports most D/A converters

• Built-in digital de-emphasis

• Built-in digital level and peak meter functions

• Support for bilingual applications

Features

• 64-pin QIP (miniature, reduced space package)

• Silicon gate CMOS process (low power)

• Single 5 V power supply (for application in portable end

products)

• Provision of a DEMO pin eases the manufacturing

processes associated with adjustment steps.

Any and all SANYO products described or contained herein do not have specifications that can handle

applications that require extremely high levels of reliability, such as life-support systems, aircraft’s

control systems, or other applications whose failure can be reasonably expected to result in serious

physical and/or material damage. Consult with your SANYO representative nearest you before using

any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other

parameters) listed in products specifications of any and all SANYO products described or contained

herein.

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

N1594TH (OT) B8-1395 No. 4882-1/24

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