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參數資料
型號: TLV320DAC3100IRHBT
廠商: TEXAS INSTRUMENTS INC
元件分類: DAC
英文描述: DAC WITH PROGRAMMABLE PLL, PQCC32
封裝: 5 X 5 MM, GREEN, PLASTIC, QFN-32
文件頁數: 25/97頁
文件大小: 1134K
代理商: TLV320DAC3100IRHBT
www.ti.com
SLAS671 – FEBRUARY 2010
5.5.3
Volume-Control Pin
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 gainmapping is shown in Table 5-18.
Table 5-18. 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
Copyright 2010, Texas Instruments Incorporated
APPLICATION INFORMATION
31
Product Folder Link(s): TLV320DAC3100
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