DA7219 datasheet(32/123 Pages) DIALOG

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DA7219

Audio codec with Advanced Accessory Detect

Company confidential

Datasheet

Revision 2.1

17-Dec -2015

32 of 123

9.3.6

Output processing

9.3.6.1

DAC digital gain

Each channel includes individual gain settings that are controllable in 0.75 dB steps ranging from

-78 dB (= mute) to 12 dB using dac_l_digital_gain and dac_r_digital_gain. The currently active gain

settings are stored in DAC_L_GAIN_STATUS and DAC_R_GAIN_STATUS registers.

9.3.6.2

High-pass filter

Any DC offset from the input path is removed via IIR filters (typically <2 Hz roll-off, configurable).

After reset the filters for both channels are enabled by default, but can be disabled by clearing

dac_hpf_en. The cut-off frequency of the filters can be programmed using dac_audio_hpf_corner.

During playback, dedicated voiceband filtering can be enabled using dac_voice_en in the

DAC_FILTERS1 register. In DAC voice mode, dac_voice_en must = 1 and dac_hpf_en must = 1 in

which case the HPF corner frequency is set using dac_voice_hpf_corner.

The low frequency roll off is configured over a wide range using the dac_voice_hpf_corner control.

In voice mode, the wind noise high-pass filter cut-off frequency is determined by the settings of the

adc_voice_hpf_corner and the dac_voice_hpf_corner register bits, These cut-off frequencies are not

fixed and vary with the sample rate being used. Table 25 shows the cut-off frequencies for all valid

settings of adc_voice_hpf_corner and dac_voice_hpf_corner, at all sample rates of 16 kHz and

below.

Table 25: Output high-pass filter settings

SR Sample Rate (kHz)

11.025

22.05

44.1

88.2

0.33

0.46

0.5

0.67

0.92

1.33

1.84

3.68

0.67

0.92

1.33

1.84

2.67

3.68

7.35

1.33

1.84

2.67

3.68

5.33

7.35

14.7

2.67

3.68

5.33

7.35

10.6

14.7

29.4

000

2.5

3.45

3.75

Voice HPF not available for sample rates above

16 kHz.

001

34.5

37.5

010

68.9

100

011

100

137.8

150

200

100

150

206.7

225

300

101

200

275.6

300

400

110

300

413.4

450

600

111

400

551.3

600

800

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