ROHM BA7242F Datasheet
1
Multimedia ICs
Color TV signal encoder
BA7242F
The BA7242F is an IC which converts analog RGB signals 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 75Ω driver.
•
Applications
TV peripheral devices
•
Features
1) Supports both NTSC and PAL systems.
2) Internal flip-flop circuit for PAL common mode
switching
3) Equipped with Y / C separated output pin.
4) Internal 75Ω driver
5) Supports subcarrier pulse for color input
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Block diagram
1
2
3
4
5
6
7
BIN
GIN
RIN
V
CC1
SYNC
BFP
GND1
V
CC2
Y
OUT
VOUT
GND2
C
OUT
NT / PAL
SCIN
14
13
12
11
10
9
8
CLAMP
BFP
BFP
BFP
VCC
SYNC
NT / PAL
BURST
FLAG
R-Y
MOD
F • F
B-Y
MOD
CHROMA
GEN
Y / C
MIX
SYNC
MIX
SYNC
V
CCGNDNT / PAL
MATRIX
PHASE
GEN
FILTER
GND
CLAMP
CLAMP
2
Multimedia ICs BA7242F
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Absolute maximum ratings (Ta = 25°C)
Parameter Symbol Limits
7
450
∗
– 20 ~ + 70
– 55 ~ + 125
Unit
V
mW
°C
°C
V
CC
Pd
Topr
Tstg
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
∗
Reduced by 4.5mW for each increase in Ta of 1°C over 25°C.
(When mounted on a 70mm × 70mm × 1.6mm glass epoxy board.)
•
Recommended operating conditions (Ta = 25°C)
Parameter Symbol Limits
4.5 ~ 5.5
0 ~ 0.7
0 ~ 0.7
0 ~ 0.7
0.45 ~ 0.60
Unit
V
V
P–P
VP–P
VP–P
VP–P
VCC
υRI
υGI
υBI
υSC
Power supply voltage
RIN input level
GIN input level
BIN input level
SCIN input level
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Pin descriptions
Pin No.
1
Pin name Function
BIN Input for analog B signal. Operate with low impedance.
Input for analog G signal. Operate with low impedance.
Input for analog R signal. Operate with low impedance.
V
CC for all except 75Ω driver.
GND for all except 75Ω driver.
3.58MHz or 4.43MHz pulse signal input.
Video signal output mode setting. HIGH level = NTSC, LOW level = PAL.
Chrominance signal output. Internal 75Ω driver.
GND for 75Ω driver.
Composite video signal output. Internal 75Ω driver.
Luminance signal output. Internal 75Ω driver.
V
CC for 75Ω driver.
2 GIN
3 RIN
4V
CC1
5 SYNC
6 BFP
7 GND1
8 SCIN
9 NT / PAL
10 C
OUT
11 GND2
12 V
OUT
13 YOUT
14 VCC2
Input for composite SYNC signal. Outputs SYNC signal to VOUT and YOUT pins
when input is LOW.
Input for burst timing signal. Simultaneously performs the burst output and initiates
the pedestal clamp for the RIN, GIN, and BIN input signals when input is LOW.
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