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PDF BA7232 Data sheet ( Hoja de datos )
| Número de pieza | BA7232 | |
| Descripción | Color TV Signal Encoder | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Multimedia ICs
Color TV Signal Encoder
BA7232FS
The BA7232FS 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, the
BA7232FS changes chroma phase according to the burst flag pulses.
The chroma signals and luminosity signals can be combined into a color TV signal or output separately, making this
IC suitable for S pins. Also, this IC comes with an output pin for the analog RGB signal. Each output has a built-in
75Ω driver.
•Applications
TV peripherals
•Features
1) Can be adapted for NTSC and PAL formats.
2) Internal flip-flop for PAL phase switching.
3) Separate Y / C output pins.
4) Analog RGB signal output pins.
•Block diagram
5) Internal 75Ω driver. (outputs color TV signals, lumi-
nosity signals, chroma signals and analog RGB sig-
nals)
6) Adaptable for color subcarrier pulse input.
BIN 1
GIN 2
RIN 3
VCC1 4
SYNCIN 5
CLAMP
BFP
CLAMP
BFP
CLAMP
BFP
75Ω 20 BOUT
75Ω 19 GOUT
75Ω 18 ROUT
MATRIX
VCC
SYNC
17 VCC2
16 SYNCOUT
BFPIN 6
75Ω 15 YOUT
NT / PAL 7
SCIN 8
FILTER
14 N.C.
75Ω 13 VOUT
GND1 9 GND
COUT 10
75Ω
12 N.C.
GND 11 GND2
1
1 page  
Multimedia ICs
•Circuit operation
(1) SYNCIN is for composite synch input. During low
input, the synchronization signal is output to YOUT,
VOUT and SYNCOUT.
(2) BFP is for burst flag pulse input. During low input,
the burst signal is output to pins CO and VO. When the
IC is set to PAL, it is this signal that directs the phase
inversion of the chroma signals. This signal also con-
trols the timing of the pedestal clamps of RIN, GIN and
BIN. During low input, the pedestal levels of RIN, GIN
and BIN are kept constant by charging an attached
capacitor.
(3) NT / PAL is the NTSC / PAL selector pin, and con-
nects to VCC when set to NTSC and to GND when set
to PAL.
BA7232FS
(4) SCIN is for color subcarrier input. Set input to a
pulse wave or sine wave (3.579545MHz for NTSC and
4.433619MHz for PAL).
(5) COUT and YOUT are for output of chroma signals
and luminosity signals, respectively. Because the chro-
ma signal and luminosity signals can be output sepa-
rately, the IC can be adapted for S pins. Each has a
75Ω driver.
(6) VOUT is for color TV signal output, and has an
internal 75Ω driver.
(7) ROUT, GOUT and BOUT are for analog RGB sig-
nal output, and have an internal 75Ω driver.
The relationship between chroma phase and burst phase during PAL processing is as follows.
NT / PAL
BFP
Chroma phases
B-Y
R-Y
burst
B-Y
B-Y
burst
R-Y
burst
R-Y
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet BA7232.PDF ] | |
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