BA7631 [ROHM]
Video switch for CANAL-Plus decoder; 视频开关CANAL加解码器
| 型号： | BA7631 |
| 厂家： | 
ROHM |
| 描述： | Video switch for CANAL-Plus decoder |
| 文件： | 总7页 (文件大小：77K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Multimedia ICs
Video switch for CANAL-Plus decoder
BA7631 / BA7631F
The BA7631 and BA7631F are audio-switching ICs for decoders for scrambled pay channels used in France and
other countries. 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.
Applications
•
Video cassette recorders
Features
•
1) All the audio-switching functions required for SECAM
CANAL -plus decoder integrated onto one chip.
2) Inputs terminated with 65kΩ resistors.
3) Built-in output buffer.
4) Wide supply voltage range (4.5V to 13.0V).
5) Low total harmonic distortion (0.005% Typ.).
6) Wide dynamic range (3.6Vrms, VCC = 12V).
7) Same control logic as for the BA7630S can be used.
Absolute maximum ratings
•
Parameter
Symbol
VCC
Limits
13.5
Unit
V
Applied voltage
1100 (DIP)
500 (SOP)
Power dissipation
Pd
mV
Operating temperature
Storage temperature
Topr
Tstg
– 25 ~ + 70
°C
°C
– 55 ~ + 125
Reduced by 11mW (DIP) or 5mW (SOP) for each increase in Ta of 1°C over 25°C.
Recommended operating conditions (Ta = 25°C)
•
Parameter
Symbol
VCC
Limits
Unit
V
Power supply voltage
4.5 ~ 13.0
1
Multimedia ICs
BA7631 / BA7631F
Block diagram
•
BF
BF
OUT1
CTL4
IN5
1
2
3
4
5
6
7
8
16 OUT2
1
2
3
4
15 CTL5
14 CTL3
13 OUT3
12 CTL2
11 IN3
SW2
BF
VCC
1
2
3
4
5
IN4
SW1
GND2
IN1
1
2
10 GND1
SW3
CTL1
9
IN2
BA7631
2
Multimedia ICs
BA7631 / BA7631F
Truth table
Pin descriptions
•
•
Pin No.
OUT1 SW1 block
Pin name
OUT1
CTL4
IN5
Function
Output 1
CTL1
CTL2
CTL5
SELECT
IN1
1
2
L
L
L
H
L
L
L
L
L
H
Control 4
IN2
3
Input 5
H
H
IN3
4
VCC
Power supply
Input 4
H
MUTE
IN5
5
IN4
6
GND2
IN1
GND (GND1 common)
Input 1
Don't care
7
8
CTL1
IN2
Control 1
9
Input 2
OUT2 SW2 block
10
11
12
13
14
15
16
GND1
IN3
GND (GND2 common)
Input 3
CTL3
CTL5
SELECT
IN1
L
H
L
L
L
CTL2
OUT3
CTL3
CTL5
OUT2
Control 2
IN3
Output 3
H
H
IN5
Control 3
H
IN3
Control 5
Output 2
OUT3 SW3 block
CTL4
SELECT
L
IN2
IN4
H
3
Multimedia ICs
BA7631 / BA7631F
Input / output circuits
•
VCC
VCC
Q1
N
2
8
12
14
15
14k
36k
1
10k
30k
50
1.8mA
3, 5, 7, 9, 11
VCC
VCC
30µA
13
16
100
25
1.8mA
65k
6.0V
125µA
4
Multimedia ICs
BA7631 / BA7631F
Electrical characteristics (unless otherwise noted, Ta = 25°C and VCC = 12V)
•
Parameter
Symbol
VCC
ICC
Min.
4.5
—
Typ.
12.0
14.9
3.6
Max.
13.0
24.0
—
Unit
V
Conditions
Recommended operating voltage
Circuit current
—
—
mA
Vrms
dB
Maximum output level
Voltage gain
Vom
3.1
– 0.5
—
f = 1MHz, THD = 0.5%
GV
0
0.5
f = 1kHz, VIN = 3.0dBm
f = 1kHz, VIN = 3.0dBm
f = 10kHz, VIN = 3.0dBm
30kHz LPF, Rg = 2.2kΩ
—
Total harmonic distortion
Interchannel crosstalk
Input conversion noise voltage
CTL switch level
THD
CTM
VMin.
VTH
0.005
– 75
20.0
2.0
0.1
%
—
– 60
40.0
3.0
dB
µVrms
—
1.0
48.5
V
ZIN
65
80.5
kΩ
—
Input impedance
᭺Not designed for radiation resistance.
Circuit operation
•
The BA7631 and BA7631F make 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.
Application example
•
22µF
22µF
+
+
BF
To VTR IN
CTL4 for SW3
from EXT OUT
BF
16
15
14
13
12
11
10
9
To DECODER IN
CTL5 for SW2
CTL3 for SW2
To TV IN
1
2
3
4
5
6
7
8
1
2
22µF
+
SW2
3
4
VCC
47µ
+
BF
1
2
22µF
+
from VTR OUT
CTL2 for SW1
from TV OUT
3
4
5
22µF
+
SW1
22µF
+
1
from VTR
TUNER OUT
2
SW3
+
22µF
from
DECODER OUT
CTL1 for SW1
Fig.1
5
Multimedia ICs
BA7631 / BA7631F
VTR
IN
TUNER
OUT
22µF
+
7
9
SW1
1
22µF
22µF
IN
OUT
DECODER
+
+
2
3
4
5
BF
1
8
22µF
+
CTL1
11
3
22µF
+
12 CTL2
14 CTL3
22µF
+
5
15
16
13
2
CTL5
SW2
IN
OUT
1
2
3
4
TV
22µF
+
BF
22µF
+
(AUX)
EXT
SW3
1
2
OUT
BF
CTL4
Fig.2
6
Multimedia ICs
BA7631 / BA7631F
Electrical characteristic curves
•
VCC = 12.0 (V)
f = 1 (kHz)
5.0
4.0
3.0
2.0
1.0
0.100
0.010
VCC = 12.0 (V)
f = 1 (kHz)
THD = 0.5 (%)
0.001 0
1.0
2.0
3.0
4.0
0
5
10
15
INPUT VOLTAGE: (Vrms)
POWER SUPPLY VOLTAGE: (V)
Fig. 3 Distortion characteristics
Fig. 4 Power supply voltage vs. dynamic
range characteristics
External dimensions (Units: mm)
•
BA7631
BA7631F
10.0 ± 0.2
19.4 ± 0.3
16
1
9
8
16
9
8
7.62
1
1.27 0.4 ± 0.1
0.3Min.
2.54
0.5 ± 0.1
0
° ~ 15
°
0.15
DIP16
SOP16
7
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