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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 75W driver.
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Applications
TV peripheral devices
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Block diagram
36 35 34 33 32 31 30 29 28 27 26 25
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22
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13
RDATA0
RDATA1
RDATA2
RDATA3
DVDD
RDATA4
RDATA5
RDATA6
RDATA7
SCIN
SYNCIN
NT / PAL
37
38
39
40
41
42
43
44
45
46
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48
BDATA3
BDATA2
BDATA1
BDATA0
VCLK
DGND
VREFOUT
N.C.
AGND1
RCLAMP
VCC1
GCLAMP
BCLAMP
GND2
R
OUT
G
OUT
B
OUT
Y
OUT
C
OUT
V
OUT
V
CC
2
YTRAP
N.C. N.C.
BDATA4 BDATA5 BDATA6 BDATA7 GDATA0 GDATA1 GDATA2 GDATA3 GDATA4 GDATA5 GDATA6 GDATA7
DECODER
LATCH
CLAMP CLAMP
MATRIX
LPF
BPF6dB6dB6dB6dB
75
GND VCC
VCC
GND
GND
CLK
75 75 75 75 75
YTRAP
Y / C
MIX
Burst
Flag
GEN.
CLAMP
VREF
CELL
MATRIX
CELL
MATRIX
CELL
MATRIX
DECODER DECODER
CLK LATCHCLK LATCHCLK
SYNC
CHROMA
GEN.
SYNC
ADD.
VCC
SYNC
8
8
8
R-Y B-Y
Y
R
G
B
SYNC
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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 75W driver.