CXD2721Q-1 Datasheet, PDF (1/70 Pages) Sony Corporation – Single-Chip Digital Signal Processor for Karaoke

CXD2721Q-1
Single-Chip Digital Signal Processor for Karaoke
Description
The CXD2721Q-1 is a Karaoke LSI suitable for
use in video CD/LD/CD-G/CD and the like. A large
capacity DRAM and AD/DA converters are built in,
and a Karaoke mode providing simple surround and
Karaoke functions such as key control, microphone
echo and voice cancelling, and a music mode
providing functions such as surround, parametric
equalizer and bass/treble tone control are contained
on a single chip.
Features
• 3-channel 1-bit AD converter, decimation filter and
prefilter operational amplifier
S/N ratio: 92dB
THD + N: 0.02%
Filter pass band ripple:
±0.5dB or less
Filter stop band attenuation: –41dB or less
(all characteristics are typical values)
• 2-channel 1-bit DA converter, oversampling filter
and post filter
S/N ratio: 97dB
THD + N: 0.005%
Filter pass band ripple:
±0.2dB or less
Filter stop band attenuation: –41dB or less
(all characteristics are typical values)
• In addition to analog I/O, digital I/O (2-channel
input/2-channel output) are provided.
The interface also supports a wide variety of
formats.
• 128K-bit DRAM for key control, microphone echo
and surround processing
Functions
• Key controller pitch settings 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 278ms (when Fs = 44.1kHz).
• Voice canceller supports settings other than center
using panpot volumes.
• Voice parametric equalizer
• Voice pitch shifter
• Mixing function to support sound multiplexing
software
100 pin QFP (Plastic)
• Digital de-emphasis function
• Simple surround function
• Music mode (switches with Karaoke mode)
Compressor function
Parametric equalizer function
Surround function
Bass/treble tone control function
Structure
Silicon gate CMOS
Applications
Equipment with Karaoke functions, such as video
CD/LD/CD-G/CD, compact music centers, video
games, etc.
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 +75
°C
• Storage temperature Tstg –55 to +150 °C
Recommended Operating Conditions
• Supply voltage
VDD 4.5 to 5.25 (5.0 typ.) V
• Operating temperature
Ta
–20 to +75
°C
I/O Capacitance
• Input capacitance CIN
9 (max.)
pF
• Output capacitance COUT
11 (max.)
pF
• I/O capacitance
CI/O
11 (max.)
pF
∗ _{Measurement conditions: VDD = VI = 0V, F = 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.
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