ROHM BU3618K Datasheet

1

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.

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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

2

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

—

—