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CXA2078Q

I²C Bus-Compatible Audio/Video Switch with Electronic Volume

Sony Semiconductor 

CXA2078Q

+9V

HW SW1

mute

+9V

Measurement

Point

52

53

+12V

54

55

56

BC547B +9V

57

+9V

600 1µF 6k 58

59

600 1µF 6k 60

61

600 1µF 6k 62

63

64

51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

10µF 10k

32

31 10µF 10k

30

29 10µF 10k

28

27 10µF 10k

26

25

+9V

24

23

22 22µF

21

6k 1µF 600

20

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

6k

47µF

1µF

SCL SDA

6k 6k 6k

1µF 1µF 1µF

600

600 600 600

Input

Signal

Fig. 6. Audio system (gain, dynamic range, Signal to noise, Crosstalk, Distortion, Volume control)

Signal applied to Pins, 63, 1, 59, 61, 15, 17, 19, 21, 36, 39

Output Signal Measured from pins 26, 28, 30, 32, 34, 49, 51

Notes) 1. All +9V supplies de-coupled close to supply pins, 25, 47, 58 with 10nF ceramic capacitor.

2. When muting audio using Hardware mute, SW1 is closed.

– 17 –

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