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