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