CXD2720Q-2
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
100 pin QFP (Plastic)
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, V
SS
= 0V)
Supply voltage
V
DD
V
SS
– 0.5 to +7.0
V
Input voltage
V
I
V
SS
– 0.5 to V
DD
+ 0.5 V
Output voltage
V
O
V
SS
– 0.5 to V
DD
+ 0.5 V
Operating temperature
Topr
–20 to +75
°C
Storage temperature Tstg
–55 to +150
°C
Recommended Operating Conditions
• Supply voltage
V
DD
4.5 to 5.5 (5.0 typ.)
• Operating temperature
Ta
–20 to +75
V
°C
Input/Output Capacitance
• Input capacitance
C
IN
9 (max.)
pF
• Output capacitance
C
OUT
11 (max.)
pF
• Input/output capacitance C
I/O
11 (max.)
pF
∗
Measurement conditions: V
DD
= V
I
= 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.
–1–
E97315-PS
SONY [ SONY CORPORATION ]
