ROHM BA7232FS Datasheet
1
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.
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Applications
TV peripherals
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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.
5) Internal 75Ω driver. (outputs color TV signals, luminosity signals, chroma signals and analog RGB signals)
6) Adaptable for color subcarrier pulse input.
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Block diagram
1BIN
2GIN
3RIN
4VCC1
5SYNCIN
6BFPIN
7NT / PAL
8SCIN
9GND1
10COUT
20 BOUT
19 GOUT
18 ROUT
17 VCC2
16 SYNCOUT
15 YOUT
14 N.C.
13 VOUT
12 N.C.
11 GND2
GND
GND
FILTER
F • F
Y / C
MIX
SYNC
MIX
PHASE
GEN.
BURST
GEN.
SYNC
V
CC
VCC
B - Y MOD.
R - Y MOD.
BFP
BFP
BFP
MATRIX
SYNC
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
CLAMP
CLAMP
CLAMP
2
Multimedia ICs BA7232FS
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Pin descriptions
Pin name
1 BIN Analog B signal input
2 GIN Analog G signal input
3 RIN Analog R signal input
4
5 SYNCIN
6 BFPIN
7 NT / PAL
8 SCIN Color subcarrier input
9 GND1 Ground for all drivers other than the 75Ω driver
10 COUT Chroma signal output. Internal 75Ω driver.
11 GND2 Ground for the 75Ω driver
12 N.C. This pin is not connected inside the IC.
13 VOUT Color TV signal output. Internal 75Ω driver.
14 N.C. This pin is not connected inside the IC.
15 YOUT Luminance signal output. Internal 75Ω driver.
16 SYNCOUT Composite synchronization signal output
17
18 ROUT Analog R signal output. Internal 75Ω driver
19 GOUT Analog G signal output. Internal 75Ω driver.
20 BOUT Analog B signal output. Internal 75Ω driver.
Pin No. Function
V
CC2
Power supply pin for all drivers other than the 75Ω driver
Burst flag pulse input (negative logic)
Composite synchronization signal input (negative logic)
Power supply pin for all drivers other than the 75Ω driver
Selecting the type of color TV signal output
(high = NTSC, low = PAL)
V
CC1
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Absolute maximum ratings (Ta = 25°C)
•
Recommended operating conditions (Ta = 25°C)
Parameter Symbol Limits Unit
Power supply voltage
V
CC
7V
Power dissipation
Pd
mW
Operating temperature Topr °C
Storage temperature Tstg °C
750
∗
∗
Reduced by 7.5mW for each increase in Ta of 1°C over 25°C.
When mounted on a 70 × 70 × 1.6mm glass epoxy board.
– 20 ~ + 70
– 55 ~ + 125
Parameter Symbol Limits Unit
Power supply voltage
V
CC
4.5 ~ 5.5 V
RIN input level
υ
RI
0 ~ 0.7
V
P-P
GIN input level
υ
GI
0 ~ 0.7
V
P-P
BIN input level
υ
BI
0 ~ 0.7
V
P-P
SCIN input level
υ
SC
0.45 ~ 0.6
V
P-P
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