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SLOS407D − FEBRUARY 2003 − REVISED AUGUST 2004
Table 1. DC Volume Control for Class-D Outputs
VOLTAGE ON THE
VOLUME PIN AS A
PERCENTAGE OF VREF
(INCREASING VOLUME
OR FIXED GAIN)
VOLTAGE ON THE
VOLUME PIN AS A
PERCENTAGE OF VREF
(DECREASING VOLUME)
GAIN OF CLASS-D
AMPLIFIER
dB
%
%
(1)
−75
0 − 4.5
0 − 2.9
4.5 − 6.7
2.9 − 5.1
−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
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
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
−7.1
−4.6
−2.0
(1)
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
(1)
36.0
(1)
Tested in production. Remaining steps are specified by design.
8
TI [ TEXAS INSTRUMENTS ]
