4- 6. IC DESCRIPTION
a IC301 IR3P90B (A BOARD)
No.Pin NameI/ODescription
This pin switches between the signal from the tuner block (INT), video, and signal
1SWI
from EXT R.G.B input pin (EXT). L : INT,H : open or EXT.
The contrast of the primary color output can be adjusted by the DC voltage input
2CONTI
to this pin.
3EXT IN BINo signal.
4EXT IN GIVHF tuning display bay signal input.
5EXT IN RIUHF tuning display bay signal input.
6VCClPositive polarity power supply connection.
7VEENegative polarity power supply connection.
8N.C.Not used. -
9ACC FILTERIThe ACC detection filter is connected.
10VIDEO INIThe video signal is input.
11COLORIColor is adjusted by the DC voltage input at this pin.
The frequency characteristics of the filter can be adjusted by the resistance value
12F ADJI
which is connected between this pin and GND.
13AGC OUT0Not used.
14AGC FILTERIThe AGC detection filter of the video block is connected.
15TRAP OUT0The 3.58 MHz trap is connected.
16CLAMPIThe capacitance which clamps the pedestal of the Y- signal is connected.
17APLIThe filter which detects the APL (Average Picture Level) of the Y-signal is connected.
18H FILTER OUT0The video signal which separates the sync signal is output.
19SYNC SEPISync signal separation circuit input. The video signal is input.
This pin outputs the sync signal which is separated at the sync circuit. The output
type is the open collector type. Therefore, it is possible to connect this pin to the
20SYNC OUT0
controller powered by another supply. The output signal is H when it is sync, and
L when it is not sync.
The L pulse (* OV) is input when the sync signal is locked, and H pulse (* 3V) is
input when. the sync signal is not locked. The sync signal which is input, and the sync
21H. PULSE INI
signal which is separated at the sync separation circuit are OR and input to the pulse
generator circuit.
22TIME CONSTIThe gate pulse width is set with the CR time constant.
The frequency characteristics of the video block can be adjusted by the DC voltage
23PICTUREI
which is input to this pin.
24KILLER FILTER IThe killer detection filter is connected.
25TINTIThe color phase can be adjusted by the DC voltage which is input at this pin.
26vcoThe crystal oscillator is connected.
27APC FIThe APC detection filter is connected.
The COMMON output amplitude can be adjusted by the DC voltage which is input
28COM AMPI
at this pin.
29GNDGND
30COM OUT0This pin outputs the pulse which drives the common electrode of the LCD.
31VEENegative polarity power supply pin.
32R OUT0The inverted primary color signal is output according to the inversion signal.
33vcc2Positive polarity power supply connection
34G OUT0The inverted primary color signal is output according to the inversion signal.
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ACEC
