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