DA7219 datasheet(35/123 Pages) DIALOG

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DA7219

Audio codec with Advanced Accessory Detect

Company confidential

Datasheet

Revision 2.1

17-Dec -2015

35 of 123

Figure 16: Equaliser filter band 4 frequency response at FS = 48 kHz

Figure 17: Equaliser filter band 5 frequency response at FS = 48 kHz

9.3.6.4

DAC soft mute

To improve the user’s perception of audio reconfigurations, the DAC channel signals may be soft

muted by asserting the control dac_softmute_en (in register. DAC_FILTERS5).The soft mute function

attenuates the digital input to the DAC, ramping the gain down in steps of 0.1875 dB from its current

level to -77.25 dB, then completely muting the channel. When dac_softmute_en is released, the

attenuation is set to -77.25 dB, and then ramped up to the previous gain level. Both left and right

channels of soft mute enabled output amplifiers are muted simultaneously. The ramping up and

down rate is dependent on the audio sample rate and can be individually configured using control

dac_softmute_en.

Setting dac_softmute_en = 1 enables a soft mute on both channels.

During active soft muting, the digital gain of the DAC will be different to the value programmed inside

controls dac_l_digital_gain_status and dac_r_digital_gain_status.

DA7219 Datasheet(PDF) 35 Page - Dialog Semiconductor