BH7240AKV Datasheet, PDF (1/9 Pages) Rohm – Color TV signal encoder

Multimedia ICs
Color TV signal encoder
BH7240AKV
The BH7240AKV is an IC that converts digital RGB signals (8-bit) to NTSC and PAL color TV signals. In addition to
composite output, luminance output, chrominance output, and analog RGB output are available. Each type of output
is equipped with an internal 75Ω driver.
•^Applications
TV peripheral devices
•^Features
1) Supports both NTSC and PAL.
2) Internal RGB3-channel DAC (internal regulator).
3) Internal burst timing generator circuit.
4) Y / C separation output pin.
5) Analog RGB signal output pin.
3) Internal 75Ω driver.
•^{Block diagram}
36
35
34
33
32
31
30
29
28
27
26
25
BDATA3 37
BDATA2 38
BDATA1 39
DECODER
8
8
DECODER
DECODER
8
CLK
LATCH CLK
LATCH CLK
LATCH
24 RDATA0
23 RDATA1
22 RDATA2
BDATA0 40
VCLK 41
VREF
CLK
DGND 42
GND
CELL
MATRIX
CLAMP
CELL
MATRIX
CLAMP
CELL
MATRIX
CLAMP
21 RDATA3
VCC
20 DVDD
19 RDATA4
VREFOUT 43
N.C. 44
AGND1 45
RCLAMP 46
VCC1 47
GCLAMP 48
GND
VCC
R
G
B
MATRIX
R-Y
B-Y
CHROMA
GEN.
Y
Burst
Flag
GEN.
SYNC
SYNC _SYNC
ADD.
LPF
YTRAP
6dB 6dB 6dB 6dB
BPF
Y/C
MIX
SYNC
GND
75
75
75
75
75
75
VCC
1
2
3
4
5
6
7
8
9
10
11
12
18 RDATA5
17 RDATA6
16 RDATA7
15 SCIN
14 SYNCIN
13 NT / PAL
1