DC Volume Control for Class-AB Outputs (VAROUTL and VAROUTR)
3-7
Reference
3.5
DC Volume Control for Class-AB Outputs (VAROUTL and VAROUTR)
Table 3–3. DC Volume Control for Class-AB Outputs
VAROUT_VOLUME (V)
AS A PERCENTAGE OF
VREF (INCREASEING
VOLUME OR FIXED
GAIN)
VAROUT_VOLUME (V)
AS A PERCENTAGE OF
VREF (DECREASING
VOLUME)
GAIN OF VAROUT
AMPLIFIER
%
%
dB
0 – 4.5
0 – 2.9
–66†
4.5 – 6.7
2.9 – 5.1
–56.0
6.7 – 8.91
5.1 – 7.2
–53.5
8.9 – 11.1
7.2 – 9.4
–50.9
11.1 – 13.3
9.4 – 11.6
–48.4
13.3 – 15.5
11.6 – 13.8
–45.9
15.5 – 17.7
13.8 – 16.0
–43.3
17.7 – 19.9
16.0 – 18.2
–40.8
19.9 – 22.1
18.2 – 20.4
–38.3
22.1 – 24.3
20.4 – 22.6
–35.7
24.3 – 26.5
22.6 – 24.8
–33.2
26.5 – 28.7
24.8 – 27.0
–30.7
28.7 – 30.9
27.0 – 29.1
–28.1
30.9 – 33.1
29.1 – 31.3
–25.6
33.1 – 35.3
31.3 – 33.5
–23.1
35.3 – 37.5
33.5 – 35.7
–20.5
37.5 – 39.7
35.7 – 37.9
–18.0
39.7 – 41.9
37.9 – 40.1
–15.5
41.9 – 44.1
40.1 – 42.3
–13.0†
44.1 – 46.4
42.3 – 44.5
–10.4
46.4 – 48.6
44.5 – 46.7
–7.9
48.6 – 50.8
46.7 – 48.9
–5.3
50.8 – 53.0
48.9 – 51.0
–2.8
53.0 – 55.2
51.0 – 53.2
–0.3
55.2 – 57.4
53.2 – 55.4
2.3
57.4 – 59.6
55.4 – 57.6
4.8
59.6 – 61.8
57.6 – 59.8
7.3
61.8 – 64.0
59.8 – 62.0
9.9
64.0 – 66.2
62.0 – 64.2
12.4
66.2 – 68.4
64.2 – 66.4
14.9
68.4 – 70.6
66.4 – 68.6
17.5
> 70.6
>68.6
20.0†
† Tested in production. Remaining steps are specified by design.
NOTE: For other values of VREF, scale the voltage values in the
first two columns by a factor of VREF/5.