7

Table 1. DC Volume Control

,

Power Analog Microelectronics Inc

08/2008 Rev 1.1

PAM8606

6W Stereo Class-D Audio Power Amplifier with DC Volume Control

www.poweranalog.com

Note:

Volume: DC voltage on Volume pin

Rf: Internal pre-amplifier feedback resistance

Ri: Internal pre-amplifier input resistance

Calculation Gain=20log(5XRf/Ri),there is one dB tolerance from device to device.

Step

Volume

Gain (dB)

Rf (kΩ)

Ri (kΩ)

1

0.0

-75

0.40

200.00

2

0.1

-40

1.26

199.60

3

0.2

-30

3.92

198.74

4

0.3

-20

11.90

196.08

5

0.4

-10

20.22

188.10

6

0.5

-5

33.33

179.78

7

0.6

0

52.47

166.67

8

0.7

5

77.49

147.53

9

0.8

10

83.02

122.51

10

0.9

11

88.65

116.98

11

1.0

12

94.37

111.35

12

1.1

13

100.12

105.63

13

1.2

14

105.87

99.88

14

1.3

15

111.58

94.13

15

1.4

16

117.21

88.42

16

1.5

17

122.74

82.79

17

1.6

18

128.12

77.26

18

1.7

19

133.33

71.88

19

1.8

20

138.35

66.67

20

1.9

21

143.15

61.65

21

2.0

22

147.71

56.85

22

2.1

23

152.04

52.29

23

2.2

24

156.11

47.96

24

2.3

25

159.92

43.89

25

2.4

26

163.49

40.08

26

2.5

27

166.80

36.51

27

2.6

28

169.86

33.20

28

2.7

29

172.69

30.14

29

2.8

30

175.30

27.31

30

2.9

31

177.68

24.70

31

3.0

32

179.87

22.32

32

3.1

33

200.00

20.13