CXD2724AQ-3 datasheet(1/65 Pages) SONY

Part #	CXD2724AQ-3

Description	Single-Chip Dolby Pro Logic Surround Decoder

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Single-Chip Dolby Pro Logic Surround Decoder

Description

The CXD2724AQ-3 is a CMOS LSI developed for

Dolby Pro Logic Surround. A SRAM for short delay

and AD/DA converters are built in, and all functions

necessary for Dolby Pro Logic Surround such as an

adaptive matrix, a passive decoder including BNR,

auto input balance, a noise sequencer and center

channel mode control are contained on a single

chip. Further, this LSI also supports Dolby 3 Stereo

and Virtual Dolby Surround.

Features

• Dolby Pro Logic Surround decoding with a single

chip

• 2-channel 1-bit AD converter, decimation filter and

prefilter operational amplifier

• 4-channel 1-bit DA converter, oversampling filter

and post filter

• Analog switch for DSP bypass

• Analog electronic attenuator (+1.5 to –29.5dB) for

center/surround channel trim

• 24K-bit SRAM for short delay

• No separation or other variance for digital

processing

• External parts reduced by incorporating analog

circuits

Functions

• Adaptive matrix

• Center channel mode control

(Normal/Phantom/Wide)

• Dolby 3 Stereo

• Auto input balance control (ON/OFF)

• Noise sequencer

• Variable delay time (0 to 34.8ms)

• 7 kHz low-pass filter (12dB/Oct)

• Modified Dolby B-type NR

• Simple SFC function

• Virtual Dolby Surround

• SFC mode

• DSP bypass mode (L, R-channel through)

Structure

Silicon gate CMOS

Applications

Equipment having Dolby Pro Logic Surround

function such as AV amplifiers, receivers and

compact music systems

Absolute Maximum Ratings (Ta = 25°C, VSS = 0V)

• Supply voltage

VDD

VSS – 0.5 to +7.0

V

• Input voltage

VI

VSS – 0.5 to VDD + 0.5

V

• Output voltage

VO

VSS – 0.5 to VDD + 0.5

V

• Operating temperature

Topr

–20 to +70

°C

• Storage temperature

Tstg

–55 to +150

*C

Recommended Operating Conditions

• Supply voltage

VDD

Analog system

4.75 to 5.25 (5.0 typ.)

V

Digital system

4.50 to 5.25 (5.0 typ.)

V

• Operating temperature

Ta

–20 to +70

°C

Input/Output Capacitance

• Input capacitance CIN

9 (max.)

pF

• Output capacitance COUT

11 (max.)

pF

• Input/output capacitance

CI/O

11 (max.)

pF

∗ Measurement conditions: V

DD

= VI = 0V, F = 1MHz

Maximum Current Consumption

(Ta = 25°C, VDD = 5.25V)

• Digital/analog block total: 166.7mA

Dolby level

• During analog input: 200 to 300mVrms

• During digital input: –20dBFS

Analog characteristics

Pro Logic ON: Dolby level = 300mVrms

Prefilter gain = –3.52dB

• S/N: L, Rch = 80dB, C, Sch = 72dB

• THD + N: L, Rch = 0.015%, C, Sch = 0.03%

∗ All values for typ.

– 1 –

E99418-PS

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.

CXD2724AQ-3

80 pin QFP (Plastic)

This device is available only to parties obtaining the license from Dolby Laboratories Licensing Corporation.

"Dolby", the double-D symbol

and "Pro Logic" are trademarks of Dolby Laboratories Licensing Corporation.

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