DA7210 datasheet(45/113 Pages) DIALOG

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DA7210

Ultra-low power stereo codec

Company confidential

Datasheet

Revision 3a

15-Oct-2015

CFR0011-120-00 Rev 5

45 of 113

8.5

Hi-Fi playback

8.5.1

5-band equaliser for playback path

To allow user-specific sound settings, the digital playback path includes a programmable 5-band

equaliser, which is enabled using control DAC_EQ_EN (address 0x1B, Table 68).

A low-pass filter, three band pass filters and a high-pass filter, with corner frequencies at

approximately 100 Hz, 300 Hz, 1 kHz, 3 kHz and 3 kHz (for FS = 44.1 kHz) are controlled by the

registers DAC_EQ1_VOL to DAC_EQ5_VOL (addresses: 0x19, Table 66; 0x1A, Table 67; 0x1B,

Table 68). These registers boost or damp each frequency band from -10.5 dB to +12 dB in 1.5 dB

steps. Saturation of the signal from boosted frequencies can be prevented by an overall damping

control ADC_EQ_GAIN (address 0x1B, Table 68).

The 5-band equaliser cannot be used at a 96 kHz sampling rate and is automatically disabled if the

ADC is configured to Voice Mode using control DAC_VOICE_EN (address 0x14, Table 61). Details

of corner frequencies are shown in Table 26. Frequency responses are illustrated in Figure 18 to

Figure 22.

8.5.2

Digital audio processing for playback path

In addition to the user selectable sound settings offered by the 5-band equaliser, the playback path

offers up to 8th order configurable audio filtering, for example, to correct the frequency response of

connected receivers, speakers or headphones.

DAC L

ADC L

ADC R

DAC R

ADC

IIR L

ADC

HP L

DAC

HP L

DAC

IIR L

ADC

HP R

ADC

IIR R

DAC

IIR R

DAC

HP R

I2S/PCM L

I2S/PCM R

Figure 25: Stereo playback (for example, freefield headphone equalisation)

For applications with stereo speakers the digital signal processing offers stereo widening with 3D

audio effects.

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