BH7236AF Datasheet, PDF (1/6 Pages) Rohm – Color TV Signal Encoder

Multimedia ICs
Color TV Signal Encoder
BH7236AF
The BH7236AF converts analog RGB signals into color TV signals in the NTSC and PAL formats. From inputs of
analog RGB signals, a composite synch signal, burst pulses and a color carrier, this IC generates a color TV signal,
and can be adapted for either NTSC or PAL standards, which are selected externally. When set to PAL, chroma
phase is switched for each line.
The chroma signals and luminosity signals can be combined into a color TV signal or output separately, making this
IC suitable for S pins. There are also pins for analog RGB signal output, and each output pin has its own internal
75Ω driver.
•^Applications
TV peripherals
•^Features
1) Can be adapted for NTSC and PAL formats.
2) Internal burst timing signal generator with half-H
killer.
3) Internal flip-flop for PAL phase switching.
4) Separate Y / C output pins.
5) Analog RGB signal output pins.
6) Internal 75Ω driver. (outputs color TV signals, lumi-
nosity signals, chroma signals and analog RGB sig-
nals)
7) Adaptable for color subcarrier pulse input.
•^{Block diagram}
GND1 1
RIN 2
GIN 3
BIN 4
N. C. 5
CLAMP
SYNC
CLAMP
SYNC
CLAMP
SYNC
MATRIX
SCIN 6
NT / PAL 7
BFPOUT 8
N. C. 9
BFP
BFP GEN.
SYNCIN 10
SYNCOUT 11
VCC1 12
24 GND2
75Ω
23 ROUT
75Ω
22 GOUT
75Ω
21 BOUT
75Ω
20 VOUT
19 VCC2
18 N. C.
17 YTRAP
75Ω
16 YOUT
75Ω
15 COUT
14 N. C.
13 N. C
1