CXD2720Q Datasheet, PDF (1/40 Pages) Sony Corporation – Single-Chip Digital Signal Processor for Karaoke

CXD2720Q
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.
100 pin QFP (Plastic)
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
(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 5.5 (5.0 typ.) V
• Operating temperature
Ta
–20 to +75
°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: 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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E96426-ST