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CXD2548

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

Sony Semiconductor 

CXD2548R

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

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.

112 pin LQFP (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 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

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 + 0.3)

• Output voltage

VO

–0.3 to +7.0 V

• 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

Recommended Operating Conditions

• Supply voltage

VDDNote) –3.4 to +5.25 V

• Operating temperature Topr

–20 to +75 °C

Note) The VDD (Min.) for the CXD2548R varies

according to the playback speed selection.

Playback

VDD (min.) [V]

speed CD-DSP block DAC block DSSP block

2×

3.4V

4.5V

3.4V

1×

1 ×∗1

3.4V

3.4V

3.4V

3.4V

3.4V

∗1 When the internal operation of the CD-DSP side

is set to double-speed mode and the crystal

oscillation frequency is halved, normal-speed

playback results.

I/O Capacitance

• Input pin

CI

• Output pin

CO

12 (Max.) pF

12 (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–

E96404-PS

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