TA1218ANG
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA1218ANG
Audio/Video Switching IC for TVs
The TA1218ANG is an audio/video switching IC for TV sets.
Conforming to I
2
C bus standards, it allows you to perform
various switching operations through the bus lines by using a
microcomputer. Thanks to its 2-channel outputs, the
TA1218ANG can also be used for the PIP systems. Furthermore,
since the presence of a signal on its sync signal output pin can be
determined by a microcomputer, it is possible to check each
input/output channel (self-diagnosis).
This IC has the same pin assignments as the TA1219ANG
(SDIP36), a 1-channel output version of the TA1218ANG, so
these chips are pin compatible on pins 3 to 20 and 23 to 40.
TA1218ANG
SDIP42-P-600-1.78
Weight: 4.13 g (typ.)
Features
•
•
•
•
•
•
•
I
2
C bus control
Video : 5-channel inputs and 2-channel outputs
(2 channels conforming to S system)
Audio : 5-channel inputs and 3-channel outputs
Self-diagnostic function
ADC inputs based on European 21-pin standards
ADC inputs based on S1/S2 terminal standards
Switchable subaddress
1
2005-11-15
TA1218ANG
Block Diagram
Det Select
Det in
V
CC
GND
−6dB
V
in
V1
V
in
V2
V
in
TV
10
28
7
12
16
38
V
out
1
4
3
33
23
V
CC
GND
Y/V
in
S1
Y/V
in
S2
)
42
36
+
S
+
34
32
S
Mute
Sync
separator
I C
bus
Pulse
conver-
ter
2
V
out
2
Y
out
Y
in
30
C
in
S1
C
in
S2
14
18
C
out
C
in
24
25
27
19
SCL
SDA
Address
I/O1 (4 level)
I/O2 (4 level)
I/O3
O4
O5
L
out
TV
L
out
1
L
out
2
Sync out
26
I L
Logic
2
20
I/O
21
22
41
40
37
1
L
in
S1
L
in
S2
L
in
V1
L
in
V2
L
in
TV
11
15
8
29
5
R
in
S1
R
in
S2
R
in
V1
R
in
V2
R
in
TV
13
17
9
31
6
39
35
2
R
out
TV
R
out
1
R
out
2
2
2005-11-15
TA1218ANG
Pin Assignment
TA1218ANG
1 L
ou
t
2
2 R
out
2
3 Det in
4 Det Select
5 L
in
TV
6 R
in
TV
7 V
in
TV
8 L
in
V1
9 R
in
V1
10 V
in
V1
11 L
in
S1
12 Y/V
in
S1
13 R
in
S1
14 C
in
S1
15 L
in
S2
16 Y/V
in
S2
17 R
in
S2
18 C
in
S2
19 I/O1
20 I/O2
21 I/O3
TA1218ANG
V
out
2 42
O5 41
L
out
TV 40
R
out
TV 39
V
out
1 38
L
out
1 37
Y
out
36
R
out
1 35
C
out
34
V
CC
33
C
in
32
R
in
V2 31
Y
in
30
L
in
V2 29
V
in
V2 28
Address 27
Sync out 26
SDA 25
SCL
GND 23
O4 22
3
2005-11-15
TA1218ANG
Pin Description
Pin
No.
Name
Function
This pin is for output a sub-channel
left audio signal. The signals fed into
the chip via L
in
V1, L
in
V2, L
in
S1,
L
in
S2, or L
in
TV is output from this
pin. The output resistance of this pin
is 45
Ω.
L
out
2
Furthermore, the signal output from
this pin is pulse-converted for use in
self-diagnosis. The converted signal
is output from Sync Out.
This output can be muted in
combination with R
out
2 by bus
control.
This pin is for output a sub-channel
right audio signal. The signals fed
into the chip via R
in
V1, R
in
V2,
R
in
S1, R
in
S2, or R
in
TV is output
from this pin. The output resistance
of this pin is 45
Ω.
R
out
2
Furthermore, the signal output from
this pin is pulse-converted for use in
self-diagnosis. The converted signal
is output from Sync Out.
This output can be muted in
combination with L
out
2 by bus
control.
Interface
100
Ω
1
1
20 kΩ
1.5 mA
100
Ω
70 kΩ
20 kΩ
1.5 mA
70 kΩ
L
out
2
SW
2
R
out
2
SW
2
3
Det in
This pin is for input a sync
separation signal. Input the signal
from Det Select to this pin with
capacitance coupling. The input
resistance of this pin is 18 kΩ.
The sync signal separated from Det
Select is outputted from Sync Out
for use in self-diagnosis.
3
7
µA/1.1 µA
1 kΩ
7.3 V
22.5 kΩ
<Sync out>
This pin is for output a sync
separation signal.
4
Signals V
in
V1, V
in
V2, V
in
TV,
Y/V
in
S1, V
out
1, V
out
2, Y
out
, or C
out
are outputted from this pin. The
output resistance of this pin is 35
Ω.
Input the signal from this pin to Det
in with capacitance coupling.
100
Ω
Det Select
SW
Det Select
4
200
Ω
1 kΩ
4
2005-11-15
TA1218ANG
Pin
No.
Name
Function
Interface
5
L
in
TV
The input dynamic range of this pin
is 6.5 V
p-p
and the input resistance is
70 kΩ.
5.2 V 70 kΩ
This pin is for input a left audio
signal from the main demodulator in
the TV set. The signal fed into this
pin is presented to L
out
TV, L
out
1,
and L
out
2.
1.5 kΩ
5
1.5 kΩ
1.5 kΩ
<L
out
1>
<L
out
2>
<L
out
TV>
6
R
in
TV
The input dynamic range of this pin
is 6.5 V
p-p
and the input resistance is
70 kΩ.
5.2 V 70 kΩ
This pin is for input a right audio
signal from the main demodulator in
the TV set. The signal fed into this
pin is presented to R
out
TV, R
out
1,
and R
out
2.
1.5 kΩ
6
1.5 kΩ
1.5 kΩ
<R
out
1>
<R
out
2>
<R
out
TV>
7
V
in
TV
The input dynamic range of this pin
is 2.0 V
p-p
and the input resistance is
30 kΩ.
5.2 V 30 kΩ
This pin is for input a composite
audio signal from the main
demodulator in the TV set. The
signal fed into this pin is presented
to V
out
1, V
out
2, Y
out
, and C
out
. The
same signal is also output from Det
Select as a sync separation signal.
1.5 kΩ
7
<V
out
1>
<Y
out
>
<C
out
>
1.5 kΩ
<V
out
2>
1.5 kΩ
<Det Select>
8
L
in
V1
The input dynamic range of this pin
is 6.5 V
p-p
and the input resistance is
70
Ω.
5.2 V 70 kΩ
This pin is for input a left audio
signal from an external source (V1
channel). This pin can also be used
for PIP signal input. The signal fed
into this pin is presented to L
out
1
and L
out
2.
1.5 kΩ
8
1.5 kΩ
<L
out
1>
<L
out
2>
5
2005-11-15
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