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1
Multimedia ICs
Video switch for CANAL-Plus decoder
BA7632AF
The BA7632AF is an audio-switching ICs for decoders for scrambled pay channels used in France and other con-
tries. The ICs include a five-input multiplexer, a four-input multiplexer and a two-input multiplexer, and allow decoder
audio switching to be done with a single IC. When used in combination with the BA7630S common logic control can
be used for audio and video switching.
The BA7632AF has larger termination resistors on the inputs than the BA7631 and BA7631F.
Applications
Video cassette recorders
Features
1) All the audio-switching functions required for SECAM
CANNAL-plus decoder integrated onto one chip.
2) Inputs terminated with 140k
resistors.
3) Built-in output buffer.
4) Wide supply voltage range (4.5V to 13.0V).
5) Low total harmonic distortion (Max. 0.005% Typ.).
6) Wide dynamic range (3.6V
rms
, V
CC
= 12V).
7) Same control logic as for the BA7630S can be used.
Absolute maximum ratings (Ta = 25C)
Parameter
Symbol
Limits
Unit
V
CC
13.5
V
Pd
500
mV
Topr
C
Tstg
C
25 ~ + 70
55 ~ + 125
Applied voltage
Power dissipation
Operating temperature
Storage temperature
Reduced by 5mW for each increase in Ta of 1
C over 25
C.
Recommended operating conditions (Ta = 25C)
Parameter
Symbol
Limits
Unit
V
CC
4.5 ~ 13.0
V
Power supply voltage
1
16
BF
BF
BF
1
2
3
4
1
2
3
4
5
1
2
15
14
13
12
11
10
9
IN2
2
3
4
5
6
7
8
BA7632AF
OUT1
CTL4
IN5
IN4
GND2
IN1
CTL1
OUT2
CTL5
CTL3
OUT3
CTL2
IN3
GND1
SW2
SW1
SW3
V
CC
2
Multimedia ICs
BA7632AF
Truth table
Pin descriptions
SELECT
L
L
L
L
H
L
H
L
L
H
H
L
MUTE
H
CTL1
CTL2
CTL5
IN1
IN2
IN3
IN5
OUT1 SW1
Don't care
SELECT
L
L
H
L
L
H
H
H
CTL3
CTL5
IN1
IN3
IN5
IN3
OUT2 SW2
SELECT
L
H
CTL4
IN2
IN4
OUT3 SW3
1
2
3
4
5
6
GND2
7
8
9
10
GND1
11
12
13
14
15
16
OUT2
CTL5
CTL3
OUT3
CTL2
IN3
IN2
CTL1
IN1
IN4
IN5
CTL4
OUT1
Pin No.
V
CC
Pin Name
Function
Output 1
Control 4
Input 5
Power supply
Input 4
GND (GND1 common)
Input 1
Control 1
Input 2
GND (GND2 common)
Input 3
Control 2
Output 3
Control 3
Control 5
Output 2
Block diagram
Ciruit operation
The BA7632AF makes it easy to construct a decoder
for the scrambled pay channels. They have been
designed specifically for audio signal decoding. As
shown in the application examples in Figs. 1 and 2,
there are inputs for TV, VCR, decoder, and AUX, to
cover a wide range of applications. When the AUX
input is not used, by setting CTL5 to "L", the system
construction becomes the same as that of the
BA7630S, and the BA7630S switching logic can be
used as is.
3
Multimedia ICs
BA7632AF
Input / output circuits
50
1.8mA
1
V
CC
1.8mA
25
V
CC
13
16
14k
36k
30k
10k
V
CC
2
8
12
14
15
6.0V
100
3, 5, 7, 9, 11
30
A
125
A
V
CC
140k
Electrical characteristics (unless otherwise noted, Ta = 25C and V
CC
= 12V)
Parameter
Symbol
Min.
Typ.
Max.
Unit
V
CC
4.5
12.0
13.0
V
I
CC
--
14.9
24.0
mA
--
--
V
om
3.1
3.6
--
V
rms
G
V
0.5
0
0.5
dB
THD
--
0.005
0.1
%
C
TM
--
75
60
dB
V
Min.
--
20.0
40.0
V
TH
1.0
2.0
3.0
V
Z
IN
110
140
165
Conditions
f = 1MHz, THD = 0.5%
f = 1kHz, V
IN
= 3.0dBm
f = 1kHz, V
IN
= 3.0dBm
f = 10kHz, V
IN
= 3.0dBm
30kHz LPF, R
g
= 2.2k
k
--
--
V
rms
Not designed for radiation resistance.
Recommended operating voltage
Supply current
Maximum output level
Voltage gain
Total harmonic distortion
Interchannel crosstalk
Input conversion noise voltage
CTL switch level
Input impedance
4
Multimedia ICs
BA7632AF
Application examples
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
BF
BF
BF
1
2
3
4
SW2
SW1
1
2
3
4
5
1
2
SW3
22
F
22
F
47
22
F
V
CC
22
F
22
F
from
22
F
22
F
to VTR IN
CTL4 for SW3
from EXT OUT
from VTR OUT
from VTR
TUNER OUT
CTL1 for SW1
DECODER OUT
from TV OUT
CTL2 for SW1
to TV IN
CTL3 for SW2
CTL5 for SW2
to DECODER IN
Fig.1
+
+
+
+
+
+
+
+
TUNER
IN
OUT
VCR
DECODER
IN
OUT
IN
TV
OUT
CTL1
CTL2
CTL3
CTL5
SW1
BF
SW2
1
4
1
2
SW3
BF
BF
1
2
3
4
5
22
F
EXT
22
F
22
F
22
F
22
F
22
F
22
F
22
F
2
3
OUT
CTL4
(AUX)
Fig.2
7
9
11
3
5
2
13
14
16
15
12
8
1
+
+
+
+
+
+
+
+
5
Multimedia ICs
BA7632AF
External dimensions (Units: mm)
0.4
0.1
1.27
0.15
0.15
0.1
0.3Min.
4.4
0.2
6.2
0.3
0.11
1.5
0.1
1
16
10.0
0.2
8
9
SOP16
Electrical characteristic curves
1.0
2.0
3.0
4.0
0
0.010
0.100
0.001
INPUT VOLTAGE (Vrms)
TOTAL HARMONIC DISTORTION (
%
)
f = 1 (kHz)
V
CC
= 12.0 (V)
Fig. 3 Distortion characteristics
5
10
15
0
1.0
2.0
3.0
4.0
5.0
V
CC
= 12 (V)
f = 1 (kHz)
THD = 0.5 (%)
MAX OUTPUT LEVEL (Vrms)
POWER SUPPLY VOLTAGE (V)
Fig. 4 Power supply voltage vs.
dynamic range characteristics
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