Texas Instruments TPA3002D2EVM, Руководство пользователя, Страница: 22 / 24

DC Volume Control for Class-D Outputs (OUT+ and OUT–)
3-6
3.4 DC Volume Control for Class-D Outputs (OUT+ and OUT–)
Table 3–2. DC Volume Control for Class-D Outputs
VOLTAGE ON THE
VOLUME PIN AS A
PERCENTAGE OF
VREF (INCREASEING
VOLUME OR FIXED
GAIN)
VOLTAGE ON THE
VOLUME PIN AS A
PERCENTAGE OF
VREF (DECREASING
VOLUME)
GAIN OF CLASS-D
AMPLIFIER
% %
dB
0 – 4.5 0 – 2.9 –75†
4.5 – 6.7 2.9 – 5.1 –40.0
6.7 – 8.91 5.1 – 7.2 –37.5
8.9 – 11.1 7.2 – 9.4 –35.0
11.1 – 13.3 9.4 – 11.6 –32.4
13.3 – 15.5 11.6 – 13.8 –29.9
15.5 – 17.7 13.8 – 16.0 –27.4
17.7 – 19.9 16.0 – 18.2 –24.8
19.9 – 22.1 18.2 – 20.4 –22.3
22.1 – 24.3 20.4 – 22.6 –19.8
24.3 – 26.5 22.6 – 24.8 –17.2
26.5 – 28.7 24.8 – 27.0 –14.7
28.7 – 30.9 27.0 – 29.1 –12.2
30.9 – 33.1 29.1 – 31.3 –9.6
33.1 – 35.3 31.3 – 33.5 –7.1
35.3 – 37.5 33.5 – 35.7 –4.6
37.5 – 39.7 35.7 – 37.9 –2.0
39.7 – 41.9 37.9 – 40.1 0.5†
41.9 – 44.1 40.1 – 42.3 3.1
44.1 – 46.4 42.3 – 44.5 5.6
46.4 – 48.6 44.5 – 46.7 8.1
48.6 – 50.8 46.7 – 48.9 10.7
50.8 – 53.0 48.9 – 51.0 13.2
53.0 – 55.2 51.0 – 53.2 15.7
55.2 – 57.4 53.2 – 55.4 18.3
57.4 – 59.6 55.4 – 57.6 20.8
59.6 – 61.8 57.6 – 59.8 23.3
61.8 – 64.0 59.8 – 62.0 25.9
64.0 – 66.2 62.0 – 64.2 28.4
66.2 – 68.4 64.2 – 66.4 30.9
68.4 – 70.6 66.4 – 68.6 33.5
> 70.6 >68.6 36.0†
† 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.