AK4695 Datasheet, PDF (32/107 Pages) Asahi Kasei Microsystems – 24bit 4ch CODEC with MIC/HP/SPK/LINE-AMP

[AK4695]
■ Digital Block
The digital block consists of the blocks shown in Figure 23. Recording path and playback path is selected by setting PFSEL
bit, PFSDO bit and DASEL1-0 bits. (Figure 24 ~ Figure 27, Table 19) PMDSP bit = “1” powers up the whole
programmable filter block. PMWNG and PMPFILx bits control the each block individually.
PMAD2/3 bits or
PMDM2/3 bits
HPFAD bit
ADCB
1st Order
HPFB
Gain Adj.
PMAD0/1 bits or
PMDM0/1 bits
ADCA
1st Order
HPFA
Gain Adj.
HPFAD bit
PMPFIL2-3 bits
HPF12-13 bits
1st Order
HPF1
HPF22-23 bits
1st Order
HPF2
LPF12-13 bits
1st Order
LPF1
EQ12-13 bits
EQ22-23 bits
2 Band
EQ1-2
PMDSP bit
“0”
“1”
PFSEL bit
PMPFIL0-1 bits
1st Order
HPF1
HPF10-11 bits
1st Order
HPF2
HPF20-21 bits
1st Order
LPF1
LPF10-11 bits
2 Band
EQ1-2
EQ10-11 bits
EQ20-21 bits
SMUTE bit
ALC
(Volume)
SMUTE
ALC0-3 bits
PMPFIL0 or
PMPFIL1 or
PMPFIL2 or
PMPFIL3 bits
SDTI
SDTO1
SDTO2
SEL DASEL1-0 bits
PMDRC bit
DRC
“0”
“1”
DRCENB bit
PMDACB bit
DVLB
SMUTEB
DACB
“0”
“1”
DRCENA bit
PMDACA bit
DVLA
SMUTEA
DACA
“0”
PFSDO bit
“1” “0”
“1”
To HP or SPK
To Line Outputs
SDTO2
SDTO1
(1) ADCA/B: Includes the Digital Filter (LPF) for ADC as shown in “FILTER CHRACTERISTICS”.
(2) HPFA/B: Digital Filter (HPF) for ADC as shown in “FILTER CHRACTERISTICS”.
(3) Gain Adj.: Applicable for use as MIC sensitivity correction.
(4) HPF1/2: High Pass Filter. Applicable for use as Wind-Noise Reduction Filter. (See “Digital Programmable Filter
Circuit”)
(5) LPF1: Low Pass Filter (See “Digital Programmable Filter Circuit”)
(6) 2-Band EQ: Applicable for use as Equalizer or Notch Filter. (See “Digital Programmable Filter Circuit”)
(7) Volume: Input Digital Volume with ALC function. (See “Input Digital Volume” and “ALC Operation”)
(8) SMUTE: Soft Mute Function (See “Digital Programmable Filter Circuit”)
(9) DRC: Dynamic range control circuit for playback path. (See “DRC Operation”)
(10) DVLA/B: Digital volume with soft mute function for playback path (See “Output Digital Volume” )
(11) DACA/B: Includes the Digital Filter (LPF) for DAC as shown is “FILTER CHARACTERISTICS”
Figure 23. Digital Block Path Select
MS1463-E-01
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2014/12