Description
The CXD3009Q is a digital signal processor LSI for CD players and is equipped with built-in digital filters, zero detection circuit, 1-bit DAC, and analog low-pass filter on a single chip.

Features
Digital Signal Processor (DSP) Block
• Playback mode supporting CAV (Constant Angular Velocity)
    – Frame jitter-free
    – Allows 0.5 to double-speed continuous playback
    – Allows relative rotational velocity readout
    – Supports external spindle control
• Wide capture range playback mode
    – Spindle rotational velocity following method
    – Supports normal-speed and double-speed playback
• 16K RAM
• EFM data demodulation
• Enhanced EFM frame sync protection
• SEC strategy-based error correction
• Subcode demodulation and Sub Q data error detection
• Digital spindle servo
• 16-bit traverse counter
• Asymmetry compensation circuit
• Serial bus-based CPU interface
• Error correction monitor signals, etc. are output from a new CPU interface.
• Servo auto sequencer
• Digital audio interface output
• Digital peak meter
• CD-TEXT data demodulation

Digital Filter, DAC, Analog Low-Pass Filter Block
• DBB (Digital Bass Boost)
• Supports double-speed playback
• Digital de-emphasis
• Digital attenuation function
• Zero detection function
• 8Fs oversampling digital filter

Applications
    CD players