Datasheet

TLV320DAC3100
www.ti.com SLAS671A –FEBRUARY 2010–REVISED MAY 2012
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 © 2010–2012, Texas Instruments Incorporated APPLICATION INFORMATION 31
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