TDA8446T Просмотр технического описания (PDF) - Philips Electronics
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TDA8446T Datasheet PDF : 16 Pages
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Philips Semiconductors
Fast RGB/YC switch for digital decoding
Product specification
TDA8446
PINNING
PIN
SYMBOL
DIP20 SO28
DESCRIPTION
SOUT
1
1 synchronization signal output; this output provides the synchronization information
extracted from the incoming signal at pin 2 (SIN).
SIN
2
2 synchronization signal input; CSYNC or CVBS signal from the peri-connector
CCL
3
3 clamping capacitor connection; the clamping pulse is generated by external circuitry
connected to this pin, the generated pulse clamps the RGB inputs.
n.c.
−
4 not connected
CLO
4
5 clamping pulse output
n.c.
−
6 not connected
BIN
5
7 B-signal input
GIN
6
8 G-signal input
RIN
7
9 R-signal input
SW1
8
10 clamping control signal input; this TTL signal is used to select the clamp signal, a LOW
level at this input forces the circuit to output the generated clamping pulse.
n.c.
−
11 not connected
CLI
9
12 clamping pulse input; this TTL signal indicates the black level clamping period for the
incoming Y signal (active-HIGH).
CIN
10
13 chrominance signal input
COUT
11
14 chrominance signal output
YIN
12
15 luminance signal input; this input also accepts the CVBS signal
FS
13
16 fast switching signal input; this signal is used to control fast switching of the luminance
signals, a HIGH level at this input forces the circuit to output the internal Y signal.
n.c.
−
17 not connected
n.c.
−
18 not connected
SW2
14
19 gain control signal input; this TTL signal is used to set the gain of the chrominance
amplifiers (A), a LOW level at this input forces the gain A to 6 dB (HIGH forces to 0 dB).
n.c.
−
20 not connected
−(R-Y)
15
21 −(R−Y) signal output
YOUT
16
22 luminance signal output
−(B−Y)
17
23 −(B−Y) signal output
n.c.
−
24 not connected
n.c.
−
25 not connected
VCC
VINT
18
26 positive supply voltage (+12 V)
19
27 internal decoupling
VEE
20
28 ground
1995 Feb 16
4
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