Datasheet

TLV320AIC3120

SLAS653A –FEBRUARY 2010–REVISED MAY 2012

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5.6.9.1 Analog Output Volume Control

The output volume control can be used to fine-tune the level of the mixer amplifier signal supplied to the

headphone driver or the speaker driver. This architecture supports separate and concurrent volume levels

for each of the four output drivers. This volume control can also be used as part of the output pop-noise

reduction scheme. This feature is available even if the ADC and DAC are powered down.

5.6.9.2 Headphone Analog Output Volume Control

For the headphone 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, which is shown in and Table 5-33. This volume control includes

soft-stepping logic. Routing the DAC output signal to the analog volume control is done by writing to page

1 / register 35, bit D7-D6..

Changing the analog volume for the headphone is controlled by writing to page 1 / register 36, bits

D6–D0. Routing the signal from the output of the analog volume control to the input of the headphone

power amplifier is done by writing to page 1 / register 36, bit D7.

The analog volume-control soft-stepping time is based on the setting in page 0 / register 63, bits D1–D0.

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