Description The CXD2548R is a digital signal processor LSI for CD players. This LSI incorporates a digital servo, digital filter, zero detection circuit, 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 builtin RAM Digital Signal Processor (DSP) Block • Playback mode which supports CAV (Constant Angular Velocity) • Frame jitter free • 0.5 × to 2.5 × continuous playback possible • Allows relative rotational velocity readout • Supports spindle external control • Wide capture range playback mode • Spindle rotational velocity following method • Supports normal-speed, double-speed playback • 16K RAM • EFM data demodulation • Enhanced EFM frame sync signal protection • SEC strategy-based error correction • Subcode demodulation and Sub Q data error detection • Digital spindle servo • 16-bit traverse counter • Asymmetry compensation circuit • CPU interface on serial bus • Error correction monitor signal, etc. output from a new CPU interface • Servo auto sequencer • Digital audio interface outputs • Digital level meter, peak meter 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 Digital Filter, DAC and Analog Low-Pass Filter Blocks • Digital de-emphasis • Digital attenuation • Zero detection function • 8Fs oversampling digital filter • S/N: 100dB or more (master clock: 384Fs, typ.) • THD + N: 0.007% or more (master clock: 384Fs, typ.) • Rejection band attenuation: –60dB or more Applications CD players
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