DA7212 datasheet(49/136 Pages) RENESAS

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Ultra-Low Power Stereo Codec

DA7212 Revision 3.6

Nov 1, 2024

CFR011-120-00

Page 49

13.22 DAC 5-Band Equalizer

To enable user controllable listening preferences, the digital playback path includes a programmable 5 band

equalizer that is enabled by control DAC_EQ_EN. A low pass filter, three band-pass filters and a high pass filter

with cut-off/centre frequencies at approximately 87 Hz, 132 Hz, 628 Hz, 2.6 kHz and 9.6 kHz (for FS=48 kHz)

offer boosting or damping of each frequency band in 1.5 dB steps from 10.5 to +12 dB. The gains of each band

can be individually configured using DAC_EQ_BAND1, DAC_EQ_BAND2, DAC_EQ_BAND3,

DAC_EQ_BAND4, DAC_EQ_BAND5 controls.

The 5-band equalizer cannot be used at 88.2 and 96 kHz sampling rate. For frequency responses see Table 32,

and Figure 15 to Figure 19.

Table 32: DAC 5-band equalizer turnover/centre frequencies

Sampling

frequency (kHz)

Centre/cut-off frequency of DAC 5-band equaliser (Hz)

Band 1

cut-off

(Note 16)

Band 2

cut-off

Band 3

cut-off

Band 4

cut-off

Band 5

cut-off

(Note 16)

563

1151

2909

11.025

117

776

2137

4009

128

845

2326

4364

441

2128

5840

22.05

124

607

2933

8048

135

664

3192

8759

418

1731

6374

44.1

132

577

2385

8784

143

628

2596

9560

88.2

N/A

Note 16 For equaliser bands 1 and 5, the cut-off frequency depends on the gain setting. The figures quoted in this table

refer to the

–1 dB point with the band gain set to –3 dB

Figure 15. Equaliser filter band 1 frequency response at FS = 48 kHz

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