TPA6130A2_15 Datasheet, PDF (17/39 Pages) Texas Instruments – TPA6130A2 138-mW DIRECTPATH™ Stereo Headphone Amplifier with I2C Volume Control

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TPA6130A2
SLOS488F – NOVEMBER 2006 – REVISED MARCH 2015
Device Functional Modes (continued)
8.4.9 Volume Control
The TPA6130A2 volume control is set through the I²C interface. The six volume control register bits are decoded
to 64 volume settings that employ an audio taper. See Table 2 for the gain table. The values listed in this table
are typical. Each gain step has a different input impedance. See Figure 33.
Gain Control Word
(Binary) Mute [7:6],
V[5:0]
11XXXXXX
00000000
00000001
00000010
00000011
00000100
00000101
00000110
00000111
00001000
00001001
00001010
00001011
00001100
00001101
00001110
00001111
00010000
00010001
00010010
00010011
00010100
00010101
00010110
00010111
00011000
00011001
00011010
00011011
00011100
00011101
00011110
00011111
Table 2. Audio Taper Gain Values
Nominal Gain (dB) Nominal Gain (V/V)
–100
–59.5
–53.5
–50.0
–47.5
–45.5
–43.9
–41.4
–39.5
–36.5
–35.3
–33.3
–31.7
–30.4
–28.6
–27.1
–26.3
–24.7
–23.7
–22.5
–21.7
–20.5
–19.6
–18.8
–17.8
–17.0
–16.2
–15.2
–14.5
–13.7
–13.0
–12.3
–11.6
0.00001
0.001
0.002
0.003
0.004
0.005
0.007
0.009
0.012
0.015
0.018
0.022
0.026
0.031
0.037
0.043
0.050
0.057
0.065
0.074
0.084
0.093
0.104
0.116
0.129
0.142
0.156
0.172
0.188
0.205
0.223
0.242
0.262
Gain Control Word
(Binary) Mute [7:6],
V[5:0]
00100000
00100001
00100010
00100011
00100100
00100101
00100110
00100111
00101000
00101001
00101010
00101011
00101100
00101101
00101110
00101111
00110000
00110001
00110010
00110011
00110100
00110101
00110110
00110111
00111000
00111001
00111010
00111011
00111100
00111101
00111110
00111111
Nominal Gain Nominal Gain (V/V)
(dB)
–10.9
–10.3
–9.7
–9.0
–8.5
–7.8
–7.2
–6.7
–6.1
–5.6
–5.1
–4.5
–4.1
–3.5
–3.1
–2.6
–2.1
–1.7
–1.2
–0.8
–0.3
0.1
0.5
0.9
1.4
1.7
2.1
2.5
2.9
3.3
3.6
4.0
0.283
0.305
0.329
0.353
0.379
0.405
0.433
0.462
0.493
0.524
0.557
0.591
0.627
0.664
0.702
0.742
0.783
0.825
0.870
0.915
0.962
1.010
1.061
1.112
1.165
1.220
1.277
1.335
1.395
1.456
1.520
1.585
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