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3.4 DC Volume Control
Table 3–2. DC Volume Control for Class-D Outputs
VOLTAGE ON THE VOLUME PIN AS
A PERCENTAGE OF VREF
(INCREASING VOLUME OR FIXED
GAIN)
%
0 – 4.5
4.5 – 6.7
6.7 – 8.91
8.9 – 11.1
11.1 – 13.3
13.3 – 15.5
15.5 – 17.7
17.7 – 19.9
19.9 – 22.1
22.1 – 24.3
24.3 – 26.5
26.5 – 28.7
28.7 – 30.9
30.9 – 33.1
33.1 – 35.3
35.3 – 37.5
37.5 – 39.7
39.7 – 41.9
41.9 – 44.1
44.1 – 46.4
46.4 – 48.6
48.6 – 50.8
50.8 – 53.0
53.0 – 55.2
55.2 – 57.4
57.4 – 59.6
59.6 – 61.8
61.8 – 64.0
64.0 – 66.2
66.2 – 68.4
68.4 – 70.6
> 70.6
DC Volume Control
VOLTAGE ON THE VOLUME PIN
AS A PERCENTAGE OF VREF
(DECREASING VOLUME)
%
0 – 2.9
2.9 – 5.1
5.1 – 7.2
7.2 – 9.4
9.4 – 11.6
11.6 – 13.8
13.8 – 16.0
16.0 – 18.2
18.2 – 20.4
20.4 – 22.6
22.6 – 24.8
24.8 – 27.0
27.0 – 29.1
29.1 – 31.3
31.3 – 33.5
33.5 – 35.7
35.7 – 37.9
37.9 – 40.1
40.1 – 42.3
42.3 – 44.5
44.5 – 46.7
46.7 – 48.9
48.9 – 51.0
51.0 – 53.2
53.2 – 55.4
55.4 – 57.6
57.6 – 59.8
59.8 – 62.0
62.0 – 64.2
64.2 – 66.4
66.4 – 68.6
>68.6
Reference
GAIN OF
CLASS-D
AMPLIFIER
dB
–75
–40.0
–37.5
–35.0
–32.4
–29.9
–27.4
–24.8
–22.3
–19.8
–17.2
–14.7
–12.2
–9.6
–7.1
–4.6
–2.0
0.5
3.1
5.6
8.1
10.7
13.2
15.7
18.3
20.8
23.3
25.9
28.4
30.9
33.5
36.0
3-5
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