Toshiba TLP411E, Техническое учебное пособие

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7-7
TDA9141 has two input terminals for the composite video/
Y signal (pin 25) and C signal (pin 26), and each of the
signals is automatically identified through I
2
C-BUS con-
trol.
Table 7-2 Terminal function of TDA4665T
Fig. 7-10 Block diagram of TDA4665T
Fig. 7-9 Pin configuration of TDA4665T
SIGNAL
CLAMPING
SIGNAL
CLAMPING
±
(R–Y)
±
(R–Y)
±
(B–Y)
±
(B–Y)
Color difference
input signals
V
P1
Sand castle
pulse input
analog supply
SANDCASTLE
DETECTOR
GND 1
FREQUENCY
PHASE
DETECTOR
DIVIDER
BY 192
LP
Digital supply
V
P2
GND 2
MED848
DIVIDER
BY 2
6 MHz
CCO
3 MHz shifting clock
LP
SAMPLE
AND
HOLD
LINE
MEMORY
LP
SAMPLE
AND
HOLD
LINE
MEMORY
I.C.
TDA4665
Addition
stages Output
buffers Color difference
Output signals
Pre amplifiers
16
14
9
5
10 1 3 4
7
12
11
8
N.C.
N.C.
N.C.
N.C.
2
6
13
15
3-3. Luminance (Y) Signal Process Circuit
The processing method differs as follows depending on type
of the signal entered.
(a) For a SECAM input, it passes through a burst signal
trap circuit.
(b) For a NTSC/PAL (with burst signal) input (YC sepa-
rated signals), the burst signal trap circuit is bypassed.
It passes through a delay circuit for a phase match-
ing to the color signal.
(c) For a NTSC/PAL (without burst signal) input, above
trap circuit and the delay circuit are bypassed to per-
form a stable color killer operation.
Pin No. Name Function
1 V
P2
+5V power supply for digital block
2 N.C. Not used
3 GND2 GND (0V) for digital block
4 I.C. Internal connection
5 SAND Sandcastle pulse input
6 N.C. Not used
7 I.C. Internal connection
8 I.C. Internal connection
9 V
P1
+5V power supply for analog block
10 GND1 GND (0V) for analog block
11 V
O(R - Y)
± (R - Y) output signal
12 V
O(B - Y)
± (B - Y) output signal
13 N.C. Not used
14 V
i(B - Y)
± (B - Y) input signal
15 N.C. Not used
16 V
i(R - Y)
± (R - Y) input signal
N.C.
GND1
o(B–Y)
V
o(R–Y)
V
P1
V
GND2
SAND
I.C.
P2
V
N.C.
I.C.
MED849
TDA4665
i(R–Y)
V
N.C.
i(B–Y)
V
1
2
4
3
5
6
7
8
I.C.
N.C.
16
15
13
14
12
11
10
9