AK4671_10 Datasheet, PDF (77/166 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/RCV/HP-AMP

[AK4671]
■ Digital Volume for B/T MIC Input (BIVOL)
The AK4671 has the digital volume (5 levels, 6dB step) for B/T mic input. The volume can be set by the BIV2-0 bits. The
volume is included at SDTIB input. The input data is changed from 0 to –24dB.
BIV2-0
Gain
0H
0dB
(default)
1H
−6dB
2H
−12dB
3H
−18dB
4H
−24dB
Others
N/A
Table 41. SDTIB Volume Code Table (N/A: Not available)
■ Path & Mixing Setting of Digital Block (Figure 57)
PMADL and PMADR bits set both ADC power management and output data selection. In case of mono operation, the
same data is output to both channel slots.
PMADL
0
0
1
1
PMADR
ADC Lch data
ADC Rch data
0
All “0”
All “0”
1
Rch Input Signal
Rch Input Signal
0
Lch Input Signal
Lch Input Signal
1
Lch Input Signal
Rch Input Signal
Table 42. ADC Mono/Stereo Select
(default)
PFSEL bit select the input data of programmable filter.
PFSEL
Programmable Filter Input
0
ADC Output (selected by Table 42) (default)
1
SDTI Input (selected by Table 48)
Table 43. Programmable Filter Input Signal Select
When ADM bit is “1”, ALC output data is output to both channels of SDTO and SVOLA as (L+R)/2, respectively.
ADM
Lch
Rch
0
L
R
(default)
1
(L+R)/2 (L+R)/2
Table 44. ALC Output Mono Mixing
MS0666-E-02
- 77 -
2010/06