Sony CXD2701Q Data Book page 49

SONY
CXD2S54M.P
Attenuator operation
Suppose
that
there are three pieces of attenuator data,
ATT1,
ATT2
and
ATT3
and
that their
relations are
ATT1 >ATT3>ATT2. Assume
that
ATT1
is
transferred
first,
followed
by ATT2.
If
ATT2
is
transferred before the value of
ATT1
is
reached
(during
the state of
A
in
Fig.
1),
the
attenuation
directly
approaches
the
value
of
ATT2.
If
ATT3
is
transferred before the value of
ATT2
is
reached (during the state
of
B
or
C
in
Fig,
1),
the attenuation
is
carried
on
from the value
at
the time (B
or C)
to
approach
the value
of
ATT3, Transition from
one
piece
of
attenuator data
to
another
is
the
same
as in
the case
of soft
muting.
Fig.
1
Transition
from one
attenuator
value
to
another
E.
Input
data timing
I
ATT Xi»XeHXo*X *XD«XD9XcwX07
»" irLTirjiTLnnj
uATCH
IT
Fig.
2
Timing
of
ATT,
SHIFT
and
LATCH
©
ATT
data
is
configured on
the
LSB
first
basis.
©
ATT
data
D:-
:
Digital
de-emphasis
control
bit
H:
Emphasis
ON
L:
Emphasis
OFF
Note
that
emphasis
time
constants are
ti
= 50
(is
and
x»
= 15
fis
at fs
= 44.1 kHz.
Dc
to
De: Attenuator
data
F.
About
IFfiT
pin
Is
}
After INIT
is
f
,
the
counters
and
registers
for
the attenuators
in
the IC are
set
at
7F,h
.
-45