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CXD2598Q

CD Digital Signal Processor with Built-in Digital Servo and DAC

Sony Semiconductor 

CXD2598Q

CD Digital Signal Processor with Built-in Digital Servo and DAC

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.

100 pin QFP (Plastic)

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

Structure

Silicon gate CMOS IC

Absolute Maximum Ratings

• Supply voltage

VDD –0.3 to +7.0 V

• Input voltage

VI

–0.3 to +7.0 V

(Vss – 0.3V to VDD + 0.3V)

• Output voltage

VO

–0.3 to +7.0 V

(Vss – 0.3V to VDD + 0.3V)

• Storage temperature Tstg –40 to +125 °C

• Supply voltage difference

VSS – AVSS –0.3 to +0.3 V

VDD – AVDD –0.3 to +0.3 V

Note) AVDD includes XVDD and AVSS includes XVSS.

Recommended Operating Conditions

• Supply voltage

VDD

2.7 to 5.5

V

• Operating temperature Topr –20 to +75 °C

Note) The VDD for the CXD2598Q varies according

to the playback speed selection.

VDD[V]

Playback speed

CD-DSP block DAC block

4×

4.75 to 5.25

2×

3.0 to 5.5

4.5 to 5.5

1×

2.7 to 5.5

2.7 to 5.5

I/O Pin Capacitance

• Input capacitance CI

11 (Max.) pF

• Output capacitance CO

11 (Max.) pF

• I/O capacitance

CI/O

11 (Max.) pF

Note) Measurement conditions VDD = VI = 0V

fM = 1MHz

Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by

any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the

operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.

–1–

E97Y14-PS

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