BA7230 Rohm, BA7230 Datasheet - Page 8

• Manufacturer Part Number: BA7230
• Description: NTSC color TV signal encoder
• Manufacturer: Rohm

•
(1) RGB and video inputs should be synchronized.
When only RGB is input, connect VIDEO IN (pin 20) to
GND with a 1 F capacitor, and synchronize PCP and
BFP to RGB.
(3) Input pins with pedestal clamps cannot be left open
and must be grounded with a low impedance. When
not used, ground with a 1 F capacitor.
Y
•
8
Input pins with pedestal clamps:
Multimedia ICs
IN
Operation notes
External dimensions (Units: mm)
– 200
– 400
– 600
f
0
600
400
200
(pin 3), B-Y
= 0
0
Fig. 13 Capture range and
100
2
1
INPUT VOLTAGE: V
200
0.889
lock range (@) vs. input
voltage
IN
300
(pin 4), R-Y
21.8
1 F
400
+ lock
+ cap
– cap
– lock
0.2
500
SZIP24
Fig. 14
f
V
0.5
IN
0
CC
= 3579.545kHz
(mV
600 700
IN
0.1
= 5V
24
23
p-p
(pin 5), VIDEO IN (pin 20)
)
1 F
800
2.8
2.54
0.3
+ 0.1
– 0.05
0.2
0.25
(2) The VCXO remains in a
free-running state except
during superimposition.
(4) Pin 4 (B-Y
(R-Y
ance and are susceptible
to the effects of noise and
other external factors dur-
ing pattern generation. For
this reason, we recom-
mend adding the circuit in
Fig. 15 to lower the input
impedance. Adding this cir-
cuit can also reduce carrier
leakage.
IN
) have high imped-
IN
) and pin 5
Q
1
, Q
3k
2
1.2mH
: 2SC2021
3k
V
BA7230LS
1.2mH
CC
Q
Fig. 15
2
300
L
LPF
1
V
R
CC
Q
L
300
16
2
1
C
(ROHM)
11
0.5MHz
1k
R
17
1 F
C
1 F
1k
10
+
+
18
17
4
5