參數(shù)資料
型號： TLV320DAC3120IRHBR
廠商： TEXAS INSTRUMENTS INC
元件分類： DAC
英文描述： SERIAL INPUT LOADING, 24-BIT DAC, PQCC32
封裝： 5 X 5 MM, PLASTIC, QFN-32
文件頁數(shù)： 42/110頁
文件大小： 1230K
代理商： TLV320DAC3120IRHBR
www.ti.com
SLAS659 – NOVEMBER 2009
Table 5-18. Analog Volume Control for Headphone and Speaker Outputs (for D7 = 1)
Analog
Register Value
Attenuation
Register Value
Attenuation
Register Value
Attenuation
Register Value
Attenuation
(dB)
0
0.0
30
–15.0
60
–30.1
90
–45.2
1
–0.5
31
–15.5
61
–30.6
91
–45.8
2
–1.0
32
–16.0
62
–31.1
92
–46.2
3
–1.5
33
–16.5
63
–31.6
93
–46.7
4
–2.0
34
–17.0
64
–32.1
94
–47.4
5
–2.5
35
–17.5
65
–32.6
95
–47.9
6
–3.0
36
–18.1
66
–33.1
96
–48.2
7
–3.5
37
–18.6
67
–33.6
97
–48.7
8
–4.0
38
–19.1
68
–34.1
98
–49.3
9
–4.5
39
–19.6
69
–34.6
99
–50.0
10
–5.0
40
–20.1
70
–35.2
100
–50.3
11
–5.5
41
–20.6
71
–35.7
101
–51.0
12
–6.0
42
–21.1
72
–36.2
102
–51.4
13
–6.5
43
–21.6
73
–36.7
103
–51.8
14
–7.0
44
–22.1
74
–37.2
104
–52.2
15
–7.5
45
–22.6
75
–37.7
105
–52.7
16
–8.0
46
–23.1
76
–38.2
106
–53.7
17
–8.5
47
–23.6
77
–38.7
107
–54.2
18
–9.0
48
–24.1
78
–39.2
108
–55.3
19
–9.5
49
–24.6
79
–39.7
109
–56.7
20
–10.0
50
–25.1
80
–40.2
110
–58.3
21
–10.5
51
–25.6
81
–40.7
111
–60.2
22
–11.0
52
–26.1
82
–41.2
112
–62.7
23
–11.5
53
–26.6
83
–41.7
113
–64.3
24
–12.0
54
–27.1
84
–42.1
114
–66.2
25
–12.5
55
–27.6
85
–42.7
115
–68.7
26
–13.0
56
–28.1
86
–43.2
116
–72.2
27
–13.5
57
–28.6
87
–43.8
117–127
–78.3
28
–14.0
58
–29.1
88
–44.3
29
–14.5
59
–29.6
89
–44.8
5.6.8.3
Class-D Speaker Analog Output Volume Control
For the speaker outputs, the analog volume control has a range from 0 dB to –78 dB in 0.5-dB steps for
most of the useful range plus mute, as seen in Table 5-17 and Table 5-18. The implementation includes
soft-stepping logic.
Routing the DAC output signal to the analog volume control is done by writing to page 1 / register 35,
bits D7–D6. Changing the analog volume for the speaker is controlled by writing to page 1 / register 38,
bits D6–D0.
Routing the signal from the output of the analog volume control to the input of the speaker amplifier is
done by writing to page 1 / register 38, bit D7.
The analog volume-control soft-stepping time is based on the setting in page 0 / register 63, bits D1–D0.
5.6.9
Analog Outputs
Various analog routings are supported for playback. All the options can be conveniently viewed on the
functional block diagram, Figure 1-1.
Copyright 2009, Texas Instruments Incorporated
APPLICATION INFORMATION
37
Product Folder Link(s): TLV320DAC3120
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