Sony CXD2701Q Data Book page 59

SONY
CXD2580M
(j)
Attenuator
ATT
data
is
a 12bits information transferred
by
bit-5
(MSB) through
bit-
16 (LSB).
The
size
is
QOOH
(0.0)
to
400H
{1 .0).
ATT
data
is
set
to
400H
by
I
NIT
going
"L".
ATT
data
(output amplitude)
QOOH
transfer
4O0H transfer
T -
1
024/Fs
(S)
The
soft
mute
function
is
performed
when
ATT
data
is
000H. De-muting
is
performed by
transferring
400H
before the
ATT
data.
(Chart
above
is
for
the
case
of
400H.)
ATT
data
1.0
\a
X
CATT1)
\l
CATT3)
\
*- CATT2)
I
Take
the
case
of
three attenuator
data,
ATT1
,
ATT2
and
ATT3
and
when
their
relations
are
ATT1
>
ATT3
>
ATT2.
Assume
that
ATT1
is
transferred
first,
followed
by ATT2.
If
ATT2
is
transferred before the
ATT1
value
is
reached
(during state
A
shown
in
the
figure),
attenuation
directly
approaches
the
value
of
ATT2.
If
ATT3
is
transferred before the
ATT2
value
is
attained (during state
B
or state C, the attenuation
proceeds from
the
value
attained
at state
B
or state
C
to
approach
the value
of
ATT3.
The
transition
from one
attenuator
datum
to
another
is
the
same
as
in
the
case
of soft
muting,
ATT
data=
4D0H
System
mode
NS="High": Noise shaping
OFF
System
mode NS="Low":
Noise shaping
ON
*400H
case, noise
shaping
can
operate
whether
or not
NS
is
on
or
off.
-55