AK4671_10 Datasheet, PDF (62/166 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/RCV/HP-AMP

[AK4671]
1. ADC: Include the Digital Filter (LPF) for ADC as shown in “FILTER CHRACTERISTICS”.
2. DAC: Include the Digital Filter (LPF) for DAC as shown in “FILTER CHRACTERISTICS”.
3. HPF: High Pass Filter. Applicable to use as Wind-Noise Reduction Filter. (See “Digital Programmable Filter”.)
4. LPF: Low Pass Filter (See “Digital Programmable Filter”.)
5. Stereo Separation: Stereo Separation Emphasis Filter & Gain Compensation. (See “Digital Programmable Filter”.)
Gain Compensation is composed with EQ0 and Gain blocks. This block adjusts the frequency response after Stereo
Separation Emphasis.
6. 5-Band Notch: Applicable to use as Equalizer or Notch Filter. (See “Digital Programmable Filter”.)
7. ALC: Input Digital Volume with ALC function. (See “Input Digital Volume” and “ALC Operation”.)
8. SVOLA: Side Tone Volume at Internal MIC/SPK or External Headset Phone Call. (See “Side Tone Volume”.)
9. 5-Band EQ: Equalizer for playback path. (See “5-band Equalizer”.)
10. DATT: Digital Volume for playback path. (See “Digital Output Volume”.)
11. SMUTE: Soft mute. (See “Soft Mute”.)
12. DATT-B: Digital Volume for Recording of Received Voice. (See “Digital Volume for Recording of Received
Voice”)
13. DATT-C: Digital Volume of Received Voice. (See “Digital Volume for Received Voice”)
14. SVOLA: Side Tone Volume at B/T Headset Phone Call. (See “Side Tone Volume for B/T Phone Call”.)
Mode
Recording Mode
Recording &
Playback Mode
Playback Mode
PMADL PMADR PMDAL PMDAR
1
1
0
0
1
0
0
0
0
1
0
0
1
1
1
1
1
0
1
1
0
1
1
1
0
0
1
1
Table 22. Recode/Playback Mode
PFSEL
0
0
0
0
0
0
1
Figure
Figure 58
Figure 59
Figure 60
ADC
2nd Order
HPF
1st Order
LPF
Stereo
Separation
Gain
Compensation
Figure 58. Path at Recording Mode
5 Band
Notch
ALC
(Volume)
ADC
DAC
2nd Order
HPF
1st Order
LPF
Stereo
Separation
Gain
Compensation
5 Band
Notch
DEM SMUTE DATT
5 Band
EQ
Figure 59. Path at Recording & Playback Mode
ALC
(Volume)
ADC
DAC
1st Order
HPF
“0” Data
DEM SMUTE DATT
5 Band
EQ
ALC
(Volume)
5 Band
EQ
Gain
Compensation
Stereo
Separation
Figure 60. Path at Playback Mode
1st Order
LPF
1st Order
HPF
MS0666-E-02
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2010/06