UPC1830GT NEC, UPC1830GT Datasheet - Page 17

• Manufacturer Part Number: UPC1830GT
• Description: FILTER-CONTAINING VIDEO CHROMA/ SYNCHRONIZING SIGNAL PROCESSING LSI COMPATIBLE WITH NTSC/PAL SYSTEM
• Manufacturer: NEC

(4) Tint control circuit
Controls the phase of a color difference signal whose amplitude is adjusted by the color control circuit, in a range of
Table 5-2 shows the demodulation angle and demodulation ratio in each mode and Figure 5-5 shows the control
characteristic.
45 according to the voltage of the tint control pin (pin 21), and adjusts tint on the screen.
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
+90
+45
_ 45
_ 90
0
0
0
400 mV
400 mV
Tint control pin voltage: 2 V
1
Tint control pin voltage: MAX.
Color control pin voltage (V)
(a) NTSC mode
(a) NTSC mode
1
NTSC
PAL
Tint control pin voltage (V)
p-p
p-p
Table 5-2. Demodulation Angle and Demodulation Ratio when
stair step R-Y, B-Y input
stair step B-Y input
Mode
2
2
3
Tint Control Pin (Pin 21) Voltage = 2 V (TYP.)
3
Figure 5-4. Color Control Characteristic
Figure 5-5. Tint Control Characteristic
105 (TYP.)
90 (TYP.)
Demodulation angle ( R-Y)
V
V
4
CC
4
CC
= 5 V
= 5 V
5
5
+90
+45
_ 45
_ 90
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
0
Demodulation ratio (R-Y/B-Y)
0.75 (TYP.)
0.61 (TYP.)
400 mV
400 mV
Tint control pin voltage: MAX.
1
Color control pin voltage (V)
Tint control pin voltage: 2 V
1
Tint control pin voltage (V)
p-p
(b) PAL mode
(b) PAL mode
p-p
stair step R-Y, B-Y input
2
stair step B-Y input
2
3
3
V
V
4
CC
CC
4
PC1830
= 5 V
= 5 V
5
5
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