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SONY
CXD2555Q
Pin No.
|
Symbol
I/O
Description
17
!
V
DD
—
Analog power
supply
for
Channel 2
AD
converter
18
NC
—
19
SUB
—
Connected
to
circuit
board
(same
potential
as
power
supply)
within
the
IC.
Falls to
GND
through
a
capacitor
on
the printed
circuit
board.
20
NC
—
21
v
ss
—
GND
for
digital
circuit:
22
XMCK2
IC
test
pin.
Always
outputs
at
"Low"
under normal
conditions.
23
TEST
1
Test
pin.
Usually
fixed at
"Low*.
Connected
with pull-down
resistor.
24
CLR
:
System-dear
input.
Usually
at
"High*,
clear at
low".
Connected
with
pull-up
resistor.
25
V
UD
—
Power
supply
for
digital circuits
26
MS
1
Master/slave
mode
switching
input.
'High*
=
master
mode; "Low"
=
slave
mode. Connected
with
pull-up
resistor.
27
LRCK
I/O
Sampling
frequency
clock
pin for
serial
I/O
system.
Output
when
in
master
mode
(Pin
26
=
"High")
;
input
when
in
slave
mode
(Pin
26
=
"Low"). Trans-
fers
Channel
1
data
at
"High"
;
Channel
2
data
at
"Low".
28
BCK
I/O
Serial
bit
transfer clock
pin
(64Fs)
for
serial
input
data SIN
and
serial
output
data
SOUT.
Output
when
in
master
mode
(Pin
26
=
"High")
;
input
when
in
slave
mode
(Pin
26
=
"Low").
Serial
input
data
is
fetched
at
rising
edge;
serial
output data
is
transmitted
at
falling
edge.
29
SIN
.
2-channel
per
1
sample
serial
data
input.
Data format
is
based on
the
complement
of 2
;
32-bit
slot
30
SOUT
2-channel
per
1
sample
serial
data output Data format
is
based on
the
complement
of 2
;
32-bit
slot.
31
v
5i
—
GND
for
digital circuits.
32
MASL
For
serial
I/O with 16-bit
serial
data, selects either the
first
16-bit
slot
or the
last
16-bit
slot of
the 32-bit
siot.
"High"
means
forward packing; "low"
means
rearward
packing.
33
MLSl
With
serial I/O,
selects either LSB-first or
MSB-first
for
input/output
to
put
in
16-bit
serial
data.
"High"
=
MSB-first;
"Low"
=
LSB-first.
34
XLSO
Crystal
selection
pin.
Use
3-bit,
XSLO
to
XSL2,
to
select
the clock input
frequency
from XTLI
(Pin
7).
35
XSL1
36
XSL2
37
DASLO
IC
test
pin.
Normally
fixed at
"High".
38
DASL1
IC
test
pin.
Normally
fixed at
"Low*.
39
WO
Synchronization
window
open
input.
"High*
=
window masked; "Low*
=
window open
(forced synchronization).
Connected
with
pull-up
resistor.
40
V„
D
—
Power
supply
for
digital circuits.
41
NC
-
42
NC
—
43
SUB
-
Connected
to
a circuit
board
(same
potential
as
power
supply) within the
IC.
Falls to
GND
through
a
capacitor
on
the
printed
circuit
board.
44
v
l:
„
—
Analog power
supply
for
Channel
1
AD
converter
45
AIN1
1
Analog
input
for
Channel
1
AD
converter
46
v
ss
-
Analog
GND
for
Channel
1
AD
converter
47
v
Si
—
Analog
GND
for
Channel
1
DA
converter
48
AOUT1
(-)
Analog
opposite
phase output
for
Channel
1
DA
converter
9fi
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