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CXD2720Q-2

E97315-PS

Single-Chip Digital Signal Processor for Karaoke

Description

The CXD2720Q-2 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

and microphone echo 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 ±0.008dB

Filter stop band attenuation: less than –62dB

(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

• Two key controllers are provided.

For their pitches, either of common or independent

setting is possible

• Key controller can be used for voice

• Microphone echo delay time can be varied to a

maximum of 185ms (when fs = 44.1kHz)

• Voice parametric equalizer

• Mixing function to support sound multiplexing

software

• Digital de-emphasis function

• Soft mute 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)