Texas Instruments SLOU121 - Manual (Page 28)

The TPA6011A4 Audio Power Amplifier Evaluation Module
3-8 Details
Table 3–2. DC Volume Control (SE Mode, V
DD
= 5 V)
SE_VOLUME(V) = VOLUME(V) – SEDIFF(V) or SEMAX(V) GAIN OF AMPLIFIER
FROM (V) TO (V)
GAIN OF AMPLIFIER
(dB)
0.00 0.26 –85
0.33 0.37 –46
0.44 0.48 –44
0.56 0.59 –42
0.67 0.70 –40
0.78 0.82 –38
0.89 0.93 –36
1.01 1.04 –34
1.12 1.16 –32
1.23 1.27 –30
1.35 1.38 –28
1.46 1.49 –26
1.57 1.60 –24
1.68 1.72 –22
1.79 1.83 –20
1.91 1.94 –18
2.02 2.06 –16
2.13 2.17 –14
2.25 2.28 –12
2.36 2.39 –10
2.47 2.50 –8
2.58 2.61 –6
2.70 2.73 –4
2.81 2.83 –2
2.92 2.95 0†
3.04 3.06 2
3.15 3.17 4
3.26 3.29 6
3.38 3.40 8
3.49 3.51 10
3.60 3.63 12
3.71 5.00 14
3.2.4 Differential Input
The TPA6011A4 line inputs allow the use of a single-ended or differential audio
source. The differential input stage of the amplifier cancels any noise that
appears on both input lines of a channel. To use the TPA6011A4 EVM with a
differential source, connect the positive lead of the audio source to the R LINE–
(L LINE–) input and the negative lead from the audio source to the R IN+
(L IN+) input. To use the TPA6011A4 with a single-ended source, ac-ground
the R IN+ and L IN+ inputs and apply the audio signal to the R LINE– and L
LINE– inputs. Line and headphone inputs share common positive inputs. If
using separate line and headphone inputs, R IN+ and L IN+ should be
ac-grounded. If using differential inputs, line and headphone inputs must be
the same. In a single-ended input application, the R IN+ and L IN+ inputs
should be ac-grounded at the audio source instead of at the device inputs for
best noise performance.