AK4695 Datasheet, PDF (34/107 Pages) Asahi Kasei Microsystems – 24bit 4ch CODEC with MIC/HP/SPK/LINE-AMP

[AK4695]
■ Digital HPFA/B
Digital High Pass Filters (HPFA and HPFB) are integrated for DC offset cancellation of the ADC input. The cut-off
frequency of the HPFA/B is proportional to the sampling frequency (fs) and the default is 3.7Hz (@fs = 48kHz). HPFAD
bit controls the ON/OFF of the HPFA/B (ON is recommended). HPFAD bit must be changed when PMAD3-0 bits = “0”
■ MIC Sensitivity Correction
The AK4695 has microphone sensitivity correction function controlled by M1ADJ3-0 bits, M2ADJ3-0 bits and
M3ADJ3-0 bits.
M0ADJ3-0, M1ADJ3-0 bits
M2ADJ3-0, M3ADJ3-0 bits
GAIN (dB)
Step
0000
0
(default)
0001
–0.75
0010
–1.5
0011
–2.25
0100
–3.0
0101
–3.75
0110
–4.5
0.75dB
0111
–5.25
1000
–6.0
1001
–6.75
1010
–7.5
1011
–8.25
1100
–9.0
Others
N/A
Table 20. MIC Sensitivity Correction (N/A: Not available)
MS1463-E-01
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2014/12