5

Multimedia ICs

BA7631 / BA7631F

Parameter

Symbol

Min.

Typ.

Max.

Unit

4.5

12.0

13.0

V

—

——

14.9

24.0

mA

3.1

3.6

—

– 0.5

0

0.5

dB

THD

—

0.005

0.1

%

—– 75

– 60

dB

—

20.0

40.0

1.0

2.0

3.0

V

—

48.5

65

80.5

Conditions

k

Ω

—

f = 1MHz, THD = 0.5%

Ω

Not designed for radiation resistance.

Recommended operating voltage

Circuit current

Maximum output level

Voltage gain

Total harmonic distortion

Interchannel crosstalk

Input conversion noise voltage

CTL switch level

Input impedance

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.

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

µF

22

µF

22

µF

22

µF

22

µF

22

µF

47

µ

22

from

To VTR IN

CTL4 for SW3

from EXT OUT

from VTR OUT

from VTR

TUNER OUT

CTL1 for SW1

To DECODER IN

CTL5 for SW2

CTL3 for SW2

To TV IN

CTL2 for SW1

from TV OUT

DECODER OUT

Fig.1

+

+

+

+

+

+

+

+