Sony CXD2701Q Data Book page 104

SONY
CXD25S5Q
®
Crystal
oscillator
frequency
selection (Fs
=
32
to
48kHz)
[Related
pins] XTLI,
XTLO, XSLO, XSL1, XSL2, UCLK,
XCLK
The
frequency
of
a
crystal oscillator
connected
externally
to
XTLI and
XTLO
can be
selected by
fixing
XSL2
at
"Low* and combining XSLO and XSL1
settings. In this
case, the
output from
XCLK
is
always
256
times
the
amount
of
Fs,
and the clock output from
UCLK
is
1/2
the crystal oscillator frequency.
Note
that
if
input
is
to
be
done by an
external
master
clock
and
not a crystal
oscillator,
input
will
be through
XTLI and
XTLO
should be
left
open.
XSL2 XSL1
XSLO
Crystal
Oscillator
XC[
_
K
Frequency
Low
Low
Low
Low
Low
Low
High
High
Low
High
Low
High
256Fs
256Fs
128Fs
512Fs 256Fs 256Fs
768Fs 256Fs
384FS
1024Fs 256Fs 512Fs
[Selection
example]
*Low*
'High*
"High-
XSL2
UCLK
xsu CXD2555Q
XSLO XCLK
XTLI XTLO
Jr-m—
To
external !C. e.g.
DSP
—
To
CXD2555Q
in
s&ve mode,
etc.
1024Fs
©Crystal
oscillator
frequency
selection (Fs
=
8
to
24kHz)
[Related
pins] XTLI,
XTLO, XSLO, XSL1, XSL2, UCLK,
XCLK
WhenXSL2
is
fixed at 'High*, the
CXD2555Q
can be
set to
operate
at
1/2 or 1/4
of the usual Fs frequency,
in this
case
also,
the frequency
of the crystal oscillator
can be
selected
by
a
combination
of
XSLO
and XSL1
settings.
XSL2
XSL1
XSLO
Crystal Oscillator
Frequency *
XCLK
UCLK
_
_.
.
Example
at
Usual
Frequency
Division _
_
.7 ,
,
. .
_
Frequency
of
Ratio of
Usual
Fs
__
T,,,
jZ KHz
High Low
High
'
Low
High
!
High
High
High
Low
High
Low
High
512Fs
1024Fs
1024F5
2048Fs
512Fs
256Fs
1024Fs
512Fs
512Fs
512Fs
1024Fs 1024Fs
1/2
1/4
1/2
1/4
Fs= 16kHz
Fs
=
8kHz
Fs= 16kHz
Fs
=
8kHz
*lf the usual frequency
is
32
kHz,
its
value
at
1/2
and 1/4
would be
16kHz
and
8kHz
respectively.
Given
the
same
calculations, the low Fs frequencies
of
44.1kHz and 48kHz
are
22.05kHz/l 1.025kHz and
24kHz/
12kHz
respectively.
100