Yamaha SPX990 Service Manual page 13

SPX990
®
YM3807
(IT380700)
MOD
(Modulation Data
Generator)
PIN
NO
NAME
I/O
FUNCTION
PIN
NO
NAME
I/O
FUNCTION
1
NC
13
MODS
0
[Outputs
waveform
data
for
ail
2
MDSIO
Inputs data
to
add
to the
wave-
14
M007
0
/channels
inside
MOD
3
MDSn
form data
inside
MOD
15
SYNCW
Sync
signal input
One
64th
of
the
4
MDSOO
0
Outputs
MOD
internal
waveform master
clock
[data with
the
same
data format
16
1C
Initial
clear
5
MDS01
0
as
MDSIO
17
CLK
3.2
MHz
6
MODO
0
18
CRS
1
CD
counter
reset
7
MODI
0
19
XMD
1
Selects 1/16
mode
(asynchronous)
8
MOD2
0
Outputs
waveform
data
for
or 1/1
mode
(synchronous)
for the
9
MOD3
0 CD
interface
10
MOD4
20
XCLK
1
CD
interface
transmission clock
11
MODS
0
input
12
VDD
Power
supply
+5V
21
NC
22 CD!
1
CD
interface
serial
data
intput
23
CDO 0
CD
interface
serial
data output
24
VSS
Power
supply ground
®
PCM63P
(XM412A00) DAC
(Digital
Analog Converter)
PIN
NO.
NAME
I/O
FUNCTION
PIN
NO.
NAME
I/O
FUNCTION
1
DC
Servo
filter
15
NC
2
•fVccA Power
supply
1
+
)
16
NC
Not used
3
REF
Reference
filter
17
NC
4
BPODC BPO
reference 18
CX
1
Bit
clock
5
BPO
Bipolar offset 19 CLK
Clock
6
lout
0
Current output 20
LE
1
LEC
input
7
A GND
Analog ground
21
DATA
I
Data
input
8
NC
Not used 22 NC
Not used
9
10
RFBl
RFB2
1
Feedback
resistor
23
24
ADJB
AD-JA
Bit
2A
adj.
Bit
2B
adj.
11
+ VddL
Power
supply
25 Vpot
Potentiometer connection
12 D..GND
Digital
ground 26
NC
1
Not used
13
+ VccL
Power
supply
27 NC
14
NC
Not used
28
-VccA
Power
supply
®
PCM1760P
{XM413A00)
ADC
(Analog
Digital
Converter)
PIN
NO-
NAME
I/O
FUNCTION
PIN
NO.
NAME
I/O
FUNCTION
1
0UT-2R 0
Rch second
stage amplifier output
15
NC
2 IN-2R
Rch second
stage
amplifier input
16
BPODC-L
Lch
bipolar offset
decoupling
3
OUT-1 R
0
Rch
first
stage amplifier
output 17
L/R
CK 0
L/R clock
output (64fs)
4
IN-1R
Rch
first
stage amplifier input
18
STROBE 0
Data
strobe output (128fs)
5
SERVO
Servo decoupling 19
256fs System
clock input (256fs)
DC
20
-Vdd - 5V
negative
6
+ Vcc + 5V
analog 21
D
GND
Digital
ground
7
A
GND
Analog ground 22
+ Vdd
+ 5V
digital
8
-Vcc -
5V
analog 23
DO 0
Data output
(LSB)
9
BGDC
Band gap
decoupling
24
D1
0
Data output
10
NC
25 D2 0
Data output
11
IN-IL
1
Lch
firs!
stage
amplifier
input
26 D3
0
Data output (MSB)
12
OUT-IL 0
Lch
first
stage
amplifier
output 27
BPODC-R
Rch
bipolar offset
decoupling
13
IN-2L
1
Lch second stage
amplifier input
28
NC
14
0UT-2L 0
Lch second
stage
amplifier
output
16
SPX990