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PDF BH7236AF Data sheet ( Hoja de datos )

Número de pieza BH7236AF
Descripción Color TV Signal Encoder
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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No Preview Available ! BH7236AF Hoja de datos, Descripción, Manual

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
75driver.
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 75driver. (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
7523 ROUT
7522 GOUT
7521 BOUT
7520 VOUT
19 VCC2
18 N. C.
17 YTRAP
7516 YOUT
7515 COUT
14 N. C.
13 N. C
1

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BH7236AF pdf
Multimedia ICs
Measurement circuit
BH7236AF
1
Analog R signal
0.1µ
Analog G signal
0.1µ
Analog B signal
0.1µ
2
3
4
5
CLAMP
SYNC
CLAMP
SYNC
CLAMP
SYNC
Color subcarrier
VCC
NT / PAL selector
6
7
MATRIX
BGPOUT 8
N.C. 9
Composite SYNCH
10
BFP
BFP GEN.
SYNCOUT measurement
point
VCC
11
12
SYNC
24
+ 75
7523
220µ
+ 75
7522
220µ
+ 75
7521
220µ
+ 75
7520
220µ
75
75
75
75
VCC
19
18 N.C.
17
+ 75
7516
220µ
75
7515
0.47µ
14 N.C.
75
75
13 N.C.
ROUT measurement
point
GOUT measurement
point
BOUT measurement
point
VOUT measurement
point
YOUT measurement
point
COUT measurement
point
Circuit operation
(1) SYNCIN is for composite synch input. During low
input, the synchronization signal is output to YOUT,
VOUT and SYNCOUT. This signal also controls the timing
of the pedestal clamps of RIN, GIN and BIN. (The
pedestal levels of RIN, GIN and BIN are kept constant by
charging an attached capacitor.)
(2) SCIN is for color subcarrier input. Set input to a
pulse wave or sine wave (3.579545MHz for NTSC and
4.433619MHz for PAL).
(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. Chroma phase is switched for each line when
the IC is set to PAL.
(4) Using the composite synch and subcarrier inputs,
the IC generates a burst flag signal, according to which
a burst signal is output to COUT and VOUT. The half-H
killer presents the burst signal from being output at the
wrong points.
(5) PAL chroma phases are also switched at a regular
cycle (1H) during vertical synchronization.
(6) COUT and YOUT are for output of chroma signals and
luminosity signals, respectively. Because the chroma
signal and luminosity signals can be output separately,
the IC can be adapted for S pins. Each has a 75dri-
ver.
(7) VOUT is for color TV signal output, and has an inter-
nal 75driver.
(8) ROUT, GOUT and BOUT are for analog RGB signal out-
put, and have an internal 75driver.
5

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