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DA7212 Datasheet(PDF) 44 Page - Dialog Semiconductor

Part # DA7212
Description  Ultra-low power stereo codec
PDF  129 Pages
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Manufacturer  DIALOG [Dialog Semiconductor]
Direct Link  http://www.dialog-semiconductor.com/
Logo DIALOG - Dialog Semiconductor

DA7212 Datasheet(HTML) 44 Page - Dialog Semiconductor

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DA7212
Ultra-low power stereo codec
Company confidential
Datasheet
Revision 3c
24-Nov-2015
44 of 129
© 2015 Dialog Semiconductor
13.22 DAC 5-band equaliser
To enable user controllable listening preferences, the digital playback path includes a programmable
5 band equaliser that is enabled by control DAC_EQ_EN. A low pass filter, a 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 equaliser 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 equaliser 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)
8
21
85
563
1151
2909
11.025
29
117
776
2137
4009
12
31
128
845
2326
4364
16
41
90
441
2128
5840
22.05
56
124
607
2933
8048
24
61
135
664
3192
8759
32
58
95
418
1731
6374
44.1
80
132
577
2385
8784
48
87
143
628
2596
9560
88.2
N/A
N/A
N/A
N/A
N/A
96
N/A
N/A
N/A
N/A
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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