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HT-CN300
IC401 VHiLC74763/-1: OSD. (LC74763)
Pin No.
Port Name
1
VSS
GND.
2
XTAL IN 1
Crystal and capacitor connection in the crystal oscillator for an internal sync signal.
3
XTAL OUT 1 Crystal and capacitor connection in the crystal oscillator for an internal sync signal.
4*
HSYNC OUT Horizontal sync signal output (AFC).
5*
XTAL IN 2
Crystal and capacitor connection in the crystal oscillator for an internal sync signal.
6*
XTAL OUT 2 Crystal and capacitor connection in the crystal oscillator for an internal sync signal
7*
VSYNC OUT Vertical sync signal output.
8
CS
Vertical sync signal output.
9
SIN
Serial data input (hysteresis input).
10
SCLK
Serial data input clock.
11
SECMA
SECAM mode switching at input.
12
526/625
Scan line switching (525/625) at input.
13
NTSC/PAL
Color NTSC/PAL switching.
14
3.58/4.43
3.58/4.43 MHz FSC switching.
15
RET
System reset input (active="L") (hysteresis input).
16
CV OUT
Composite video signal output.
17
VDD 2
Power supply for creating composite video signal levels.
18
CV IN
Composite video signal input.
19*
CV CR
SECAM chrominance signal input.
20
SYNC IN
Video signal input in the built-in sync separation circuit.
21*
SEPC
Bias input in the built-in sync separation circuit.
22
VSS
GND.
23
PD OUT
AFC control voltage output.
24
AMP IN
Filter.
25
AMP OUT
Filter.
26
FC
AFC control voltage input.
27
VCON IN
Coil and capacitor connection in the LC oscillator for VCO.
28
VCO OUT
Coil and capacitor connection in the LC oscillator for VCO.
29*
SYNC DET
EX-NOR output by horizontal sync signals (AFC) and CSYNC (sync separation).
30
VDD 1
Power supply (+5V: digital)
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
30
1
FUNCTION TABLE OF IC
29
28
27
26
25
2
3
4
5
Figure 38 BLOCK DIAGRAM OF IC
Function
24
23
22
21
6
7
8
9
10
– 38 –
20
19
18
17
16
11
12
13
14
15
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