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SONY*
CXD2701
Q
Digital
Signal
Processing
LSI
for
Audio
Description
The
CXD2701Q
digital
signal
processing
LSI
incorporates both reverb
and
equalizer functions
into
a
single IC
capable
of
handling
2-channel
digital
audio
signals.
Features
Uses
external
DRAM
for
delay
signal
processing.
Sound
field
processing
features
such as
delay,
echo,
and
reverb are software
programmable.
•
Frequency response
of
the
parametric equalizer
can
be
dynamically
changed
by
using the
program
setting
to
vary
the
coefficient
value.
Structure
Silicon
gate
CMOS
IC
Functions
• 2 channels
• 24-bit
word-length data processing
•
Programmable sound
field
processing
Pre-sound
field
processing using
down-sampling
(fs->
fs/2),
Post-
processing
with
up-sampling
(fs/2-*fs)
•
Uses
external
DRAM,
either
$4KX4-bit
or
256Kx4-bif
for
delay
control.
•
Delay
amount
for
L and
R
channels can be
set
to
a
maximum
of
64K
delay
samples
•
Built-in
32-bit
equalizer
register
•
Digital
de-emphasis
function (32K, 44.1
K,
48K)
•
Input/Output format
Input
:
Two's
complement
MSB
first.
LSB
first
(24-bit
or
16-bit)
Output
:
Two's complement
MSB
first,
LSB
first
(24-bit, 20-bit,
18-bit
or
16-bit)
Absolute
Maximum
Ratings
(Ta=25°c
,
Vss=0V)
• Supplyvoltage
Vdd
•
Input voltage
Vi
• Operating temperature
Topr
•
Storage temperature
Tstg
•
Output
current
lo
Vss-0.3
to
+7.0
Vss-0.3
to
Vdd+0.3
-20
to
+75
-55
to
+150
-10
to
+10
V
V
°c
mA
Recommended
Operating Conditions
• Supplyvoltage
Vdd
4.5
to
S.5
(5.0V
Typ.)
V
•
Operating temperature
Topr
-20
to
+75
"C
•
OSC
frequency
fxt
15
to
25
MHz
I
E9GY07
-
ST
- 179-
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