Description

The CXD2585Q is a digital signal processor LSI for CD players. This LSI incorporates a digital servo.

Features

• All digital signal processings during playback are performed with a single chip

• Highly integrated mounting possible due to a built-in RAM

Digital Signal Processor (DSP) Block

• Playback mode supporting CAV (Constant Angular Velocity)

• Frame jitter free

• 0.5× to 4× continuous playback possible

• Allows relative rotational velocity readout

• Wide capture range playback mode

• Spindle rotational velocity following method

• Supports 1× to 4× playback variable pitch playback

• Bit clock, which strobes the EFM signal, is generated by the digital PLL.

• EFM data demodulation

• Enhanced EFM frame sync signal protection

• Refined super strategy-based powerful error correction

C1: double correction, C2: quadruple correction

Supported during 4× playback

• Noise reduction during track jumps

• Auto zero-cross mute

• Subcode demodulation and Sub-Q data error detection

• Digital spindle servo

• 16-bit traverse counter

• Asymmetry correction circuit

• CPU interface on serial bus

• Error correction monitor signal, etc. output from a new CPU interface

• Servo auto sequencer

• Fine search performs track jumps with high accuracy

• Digital audio interface output

• Digital level meter, peak meter

• Bilingual supported

• VCO control mode

• CD TEXT data demodulation

Digital Servo (DSSP) Block

• Microcomputer software-based flexible servo control

• Offset cancel function for servo error signal

• Auto gain control function for servo loop

• E:F balance, focus bias adjustment function

• Surf jump function supporting micro two-axis

• Tracking filter: 6 stages Focus filter: 5 stages

Applications

CD players