DA7219 datasheet(36/123 Pages) DIALOG

36 / 123 page

DA7219

Audio codec with Advanced Accessory Detect

Company confidential

Datasheet

Revision 2.1

17-Dec -2015

36 of 123

9.4

Output paths

9.4.1

Digital to Analogue Converter (DAC)

The DA7219 codec includes a stereo audio DAC. Left and right channels of the DAC are

independently and automatically enabled whenever the corresponding output filter channel is

enabled.

The DAC is clocked at 3.072 MHz or 2.8224 MHz depending on the output sample rate (SR). Left

and right channels of the DAC are independently and automatically enabled whenever the

corresponding output filter channel is enabled.

The integrated stereo DAC is suitable for high quality audio playback by MP3 players and by portable

multimedia players of all kinds.

The left and right channels of the DAC can be individually enabled using controls dac_l_en and

dac_r_en.

Each channel includes individual gain settings that are controllable in 0.75 dB steps from -78 dB to

12 dB using dac_l_digital_gain_status and dac_r_digital_gain_status. The currently active gain

settings are stored in DAC_L_GAIN_STATUS and DAC_R_GAIN_STATUS registers.

On the dedicated DAC_L_CTRL and DAC_R_CTRL registers, settings such as mute and ramping of

gain changes can be configured. If ramping is enabled using the control bits dac_l_ramp_en or

dac_r_ramp_en, the rate of the ramping can be controlled using gain_ramp_rate in the

GAIN_RAMP_CTRL register.

A digital high-pass filter for each DAC channel is implemented with a 3 dB cut-off frequency

controlled in the DAC_FILTERS1 register by dac_audio_hpf_corner. The high-pass filter is enabled

by control dac_hpf_en. After Reset, the high pass filters for both channels are enabled by default.

9.4.2

Headphone outputs

DIGITAL ENGINE

DACL

DACR

HP_L

HP_R

HP_L_AMP

-57: 1.0: +6 dB

HP_R_AMP

-57: 1.0: +6 dB

DA7219

MIXOUT_L

MIXOUT_R

Figure 18: Headphone output paths showing the two amplifiers

9.4.2.1

Buffer amplifier

The left-channel buffer amplifier MIXOUT_L, is enabled by setting mixout_l_amp_en = 1.

The right channel output buffer MIXOUT_R is controlled in the same manner.

DA7219 Datasheet(PDF) 36 Page - Dialog Semiconductor

DA7219 Datasheet(HTML) 36 Page - Dialog Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL