Multimedia ICs
•Application example (NTSC color TV signals)
BA7232FS
Analog B signal
Analog G signal
Analog R signal
0.1µ
1
0.1µ
2
0.1µ
3
VCC
4
CLAMP
BFP
CLAMP
BFP
CLAMP
BFP
Composite synch
5
75Ω
20
75Ω
19
75Ω
18
MATRIX
VCC
17
SYNC
16
VCC
Composite synch output
Burst flag pulse
(BFP)
Color subcarrier
4.7k
6
VCC
7
0.1µ
8
560
FILTER
9
GND
75Ω
15
14
+
75
75Ω
13
220µ
12
Color TV
signal output
10
75Ω
GND
11
•Operation notes
(1) Input impedance at the input terminals should be as
•External dimensions (Units: mm)
low as possible as the analog RGB signal is clamped
there.
8.7 ± 0.2
(2) The color subcarrier should have a duty of 50%.
20
11
Duty fluctuation will affect chroma phase. Resistance-
splitting input is used in the "Application example" to
accommodate 5VP-P CMOS input. For other types of
1
10
input, adjust to 0.5VP-P at SCIN.
(3) Composite synch and burst flag pulse inputs should
conform to their respective standards, as improper tim-
0.8
0.36 ± 0.1
0.3Min.
0.15
ing between them can prevent the TV from displaying
color images. For input, use the TTL level and an
SSOP - A20
impedance of 8kΩ.
6