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CXD2720Q

E96426-ST

Single-Chip Digital Signal Processor for Karaoke

Description

The CXD2720Q is a digital signal processor LSI for

Karaoke, suitable for use in LD/CD/CD-G/video CD

and the like.

A large capacity DRAM and AD/DA converters are

built in, and Karaoke functions such as key control,

microphone echo and voice canceling are contained

on a single chip.

Features

• 3-channel 1-bit AD converter and decimation filter

S/N ratio: 88 dB

THD + N: 0.016%

Filter pass band ripple:

less than ±0.5dB

Filter stop band attenuation: less than –41dB

(all characteristics are typical values)

• 2-channel 1-bit DA converter and oversampling

filter

S/N ratio: 98dB

THD + N: 0.006%

Filter pass band ripple:

less than ±0.2dB

Filter stop band attenuation: less than –41dB

(all characteristics are typical values)

• In addition to analog input/output, 2-channel input/

2-channel output of digital input/output are provided.

The interface also supports a variety of formats.

• 128K-bit DRAM for key control and microphone

echo processing

Functions

• Key controller pitch setting can be varied to a

maximum of ±1 octave with a precision of 14 bits

• Microphone echo delay time can be varied to a

maximum of 185ms (when Fs = 44.1kHz)

• Voice canceller supports settings other than center

by the panpot volume

• Voice parametric equalizer

• Voice pitch shifter

• Mixing function to support sound multiplexing

software

• Digital de-emphasis function

Structure

Silicon gate CMOS

Applications

Equipment having Karaoke function, such as

LD/CD, compact music center, video games, etc.

Absolute Maximum Ratings

• Supply voltage

V

• Input voltage

• Output voltage

• Operating temperature

Topr

–20 to +75

°C

• Storage temperature Tstg

–55 to +150

°C

Recommended Operating Conditions

• Supply voltage

V

• Operating temperature

Ta

–20 to +75

°C

Input/Output Capacitance

• Input capacitance

9 (max.)

pF

• Output capacitance

pF

11(max.)

pF

∗ Measurement conditions: V

DD

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.

100 pin QFP (Plastic)