Read Sharp XV-C2E (serv.man4) Service Manual online
XV-C2E
29
3. IC4209 (VHiCXD1178Q-1) D/A converter
1) Block Diagram
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
47
48
36
37
27
43
44
45
46
38
39
28
33
30
31
40
41
29
42
34
33
32 VB
I
REF
V
REF
VG
BCK
BO
BO
DV
SS
DV
SS
AV
SS
AV
DD
AV
DD
DV
DD
DV
DD
AV
DD
AV
DD
GCK
RCK
GO
GO
RO
RO
+
–
CE
BLK
B7
B6
B5
B4
B3
B2
B1
G7
G6
G5
G4
G3
G2
G1
R7
R6
R5
R4
R3
R2
R1
(LSB)R0
(LSB)G0
(LSB)B0
DECODER
DECODER
DECODER
DECODER
DECODER
DECODER
LATCHES
LATCHES
LATCHES
2LSB'S
CURRENT
CELLS
2LSB'S
CURRENT
CELLS
2LSB'S
CURRENT
CELLS
6MSB'S
CURRENT
CELLS
6MSB'S
CURRENT
CELLS
6MSB'S
CURRENT
CELLS
CLOCK
GENERATOR
CLOCK
GENERATOR
CLOCK
GENERATOR
CURRENT CELLS
(FOR FULL SCALE)
BIAS VOLTAGE
GENERATOR
2) Remarks of Terminals and Input/Output Terminal Equivalent Circuit
Terminal No.
Symbol
Remarks
1~8
R0~R7
9~16
G0~G7
Digital input
17~24
B0~B7
25
BLK
Blanking terminal.
When it is set at "H", no signal is
outputted. (Output: 0V)
When it is set at "L", the signal is
outputted.
When it is set at "H", no signal is
outputted. (Output: 0V)
When it is set at "L", the signal is
outputted.
32
VE
Connect a 0.1uF or so capacitor.
27
RCK
Clock terminal.
28
GCK
All input terminals are compatible
29
BCK
with TTM-CMOS.
30, 31
DV
SS
Digital GND
33
AV
SS
Analog GND
26
CE
Chip enable terminal.
When it is set at "H", no signal is
outputted (Output: 0V) and the
power consumption is minimized.
When it is set at "H", no signal is
outputted (Output: 0V) and the
power consumption is minimized.
35
I
REF
Connect a "16R" resistor which
has 16 times larger value than the
output resistance value "R".
has 16 times larger value than the
output resistance value "R".
34
V
REF
Output full scale is set.
42
VG
Connect a 0.1uF or so capacitor.
43~46
AV
DD
Analog V
DD
37
RO
Current output terminal.
39
GO
Output can be taken out by con-
41
BO
necting a resistor.
36
RO
Reverse current output terminal.
38
GO
Normally, it is connected to the
40
BO
analog ground.
47, 48
DV
DD
Digital V
DD
Terminal No.
Symbol
Remarks
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