Texas Instruments SLOU121 manual Differential Input

The TPA6011A4 Audio Power Amplifier Evaluation Module

Table 3–2. DC Volume Control (SE Mode, VDD = 5 V)

SE_VOLUME(V) = VOLUME(V) – SEDIFF(V) or SEMAX(V)		GAIN OF AMPLIFIER
FROM (V)	TO (V)	(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

3.2.4Differential 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.

3-8 Details