Description
The CXD2598Q is a digital signal processor LSI for CD players. This LSI incorporates a digital servo, digital filter, 1-bit DAC and analog low-pass filter on a single chip.

FEATUREs
• All digital signal processing during playback is 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 normal-speed to 4×speed playback
• Supports variable pitch playback
• The 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×speed 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 outputs
• Digital level meter, peak meter
• Bilingual compatible
• 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 functions
• Surf jump function supporting micro two-axis
• Tracking filter: 6 stages
  Focus filter: 5 stages

Digital Filter, DAC and Analog Low-Pass Filter Blocks
• DBB (digital bass boost) function
• Digital de-emphasis
• Digital attenuation
• 8fs oversampling digital filter
• Adoption of tertiary ∆∑noise shaper
• S/N: 100dB or more (master clock: 384Fs, typ.)
  Logical value: 109dB
• THD + N: 0.007% or less (master clock: 384Fs, typ.)
• Rejection band attenuation: –60dB or less
• Double-speed playback supported

Applications
CD players