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Multimedia ICs
3-channel 8-bit D / A converter
BU3618K
The BU3618K is an RGB 3-channel, 8-bit D / A converter CMOS IC featuring high speed and low power consumption. An internal reference voltage supply eliminates the need to provide an external reference voltage supply.
•
Applications
Video-CDs, CD-Vs, CD karaoke sets
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Features
1) 8-bit resolution.
2) Current output model.
3) Low power consumption.
4) High-speed operation enabled.
5) Internal reference voltage supply.
6) TTL input.
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Block diagram
DECODER DECODER DECODER
LATCH LATCH
LATCH
12
1110987654321
23 24 25 26 27 28 29 30 31 32 33
13
14
15
16
17
18
19
20
21
22
44
43
42
41
40
39
38
37
36
35
34
VREF
CURRENT
CELL
CURRENT
CELL
CURRENT
CELL
R0
G7
G6
G5
G4
G3
G2
G1
G0
B7
B6
OUTR
AV
DDR
AGNDR
N.C.
OUTG
AV
DDG
AGNDG
N.C.
OUTB
AV
DDB
AGNDB
B5
B4
B3
B2
DV
DD2
DGND2
B1
B0
CLK
AV
DD2
VREF
R1
R2
R3
R4
DV
DD1
DGND1R5R6
R7
AGND1
IREF
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Multimedia ICs BU3618K
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Pin descriptions
For connection of output current adjustment resistor, VREF output
Analog ground 1
RED data input (bit 7, MSB)
RED data input (bit 6)
RED data input (bit 5)
Digital ground 1
Digital power supply 1
RED data input (bit 4)
RED data input (bit 3)
RED data input (bit 2)
RED data input (bit 1)
RED data input (bit 0, LSB)
GREEN data input (bit 7, MSB)
GREEN data input (bit 6)
GREEN data input (bit 5)
GREEN data input (bit 4)
GREEN data input (bit 3)
GREEN data input (bit 2)
GREEN data input (bit 1)
GREEN data input (bit 0, LSB)
BLUE data input (bit 7, MSB)
BLUE data input (bit 6)
BLUE data input (bit 5)
BLUE data input (bit 4)
BLUE data input (bit 3)
BLUE data input (bit 2)
Digital power supply 2
Digital ground 2
BLUE data input (bit 1)
BLUE data input (bit 0, LSB)
System clock
Analog power supply 2
External capacitor connection pin (C = 0.1µF)
Analog ground B
Analog power supply B
BLUE output
Analog ground G
Analog power supply G
GREEN output
Analog ground R
Analog power supply R
RED output
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
I
I
I
I
—
—
I
I
I
—
O
—
—
O
—
—
—
O
—
—
—
O
B5
B4
B3
B2
DV
DD2
DGND2
B1
B0
CLK
AV
DD2
VREF
AGNDB
AV
DDB
OUTB
N.C.
AGNDG
AV
DDG
OUTG
N.C.
AGNDR
AV
DDR
OUTR
Pin No.
Pin name Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
I / O I / O
—
—
I
I
I
—
—
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
IREF
AGND1
R7
R6
R5
DGND1
DV
DD1
R4
R3
R2
R1
R0
G7
G6
G5
G4
G3
G2
G1
G0
B7
B6
Pin No.
Pin name Function
—
—