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| 型號(hào)： | TLV320AIC3120IRHBT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | AUDIO AMPLIFIER, PQCC32 |
| 封裝： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件頁(yè)數(shù)： | 95/150頁(yè) |
| 文件大?。?/td> | 1507K |
| 代理商： | TLV320AIC3120IRHBT |
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SLAS653 – FEBRUARY 2010
5.6.3
Volume-Control Pin
The range of voltages used by the 7-bit SAR ADC is shown in the Electrical Characteristics table.
The volume-control pin is not enabled by default, but it can be enabled by writing 1 to page 0 / register
116, bit D7. The default DAC volume control uses software control of the volume, which occurs if page 0 /
register 116, bit D7 = 0. Soft-stepping the volume level is set up by writing to page 0 / register 63, bits
D1–D0.
When the volume-pin function is used, a 7-bit Vol ADC reads the voltage on the VOL/MICDET pin and
updates the digital volume control. (It overwrites the current value of the volume control.) The new volume
setting which has been applied due to a change of voltage on the volume control pin can be read on
page 0 / register 117, bits D6–D0. The 7-bit Vol ADC clock source can be selected on page 0 / register
116, bit D6. The update rate can be programmed on page 0 / register 116, bits D2–D0 for this 7-bit SAR
ADC.
The VOL/MICDET pin gain mapping is shown in Table 5-26.
Table 5-26. VOL/MICDET Pin Gain Mapping
VOL/MICDET PIN SAR OUTPUT
DIGITAL GAIN APPLIED
0
18 dB
1
17.5 dB
2
17 dB
:
35
0.5 dB
36
0.0 dB
37
–0.5 dB
:
89
–26.5 dB
90
–27 dB
91
–28 dB
:
125
–62 dB
126
–63 dB
127
Mute
The VOL/MICDET pin connection and functionality are shown in Figure 1-1.
As shown in Table 5-26, the VOL/MICDET pin has a range of volume control from 18 dB down to –63 dB,
and mute. However, if less maximum gain is required, then a smaller range of voltage should be applied
to the VOL/MICDET pin. This can be done by increasing the value of R2 relative to the value of (P1 + R1),
so that more voltage is available at the bottom of P1. The circuit should also be designed such that for the
values of R1, R2, and P1 chosen, the maximum voltage (top of the potentiometer) does not exceed
AVDD/2 (see Figure 5-30). The recommended values for R1, R2, and P1 for several maximum gains are
shown in Table 5-27. Note that in typical applications, R1 should not be 0
, as the VOL/MICDET pin
should not exceed AVDD/2 for proper ADC operation.
Copyright 2010, Texas Instruments Incorporated
APPLICATION INFORMATION
49
Product Folder Link(s): TLV320AIC3120
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