AK4637 Datasheet, PDF (43/96 Pages) Asahi Kasei Microsystems – 24bit Mono CODEC with MIC - SPK-AMP

[AK4637]
■ Digital Block
The digital block consists of the blocks shown in Figure 39. Recording path and playback path is selected
by setting ADCPF bit, PFDAC1-0 bits and PFSDO bit (Figure 40 ~ Figure 43, Table 24).
PMADC bit
HPFAD bit
ADC
1st Order
HPF1
ADCPF bit
“1” “0”
SDTI
PMPFIL bit
HPF bit
LPF bit
EQ2-5 bits
1st Order
HPF2
1st Order
LPF
4-band
EQ
ALC bit
EQ1 bit
“0” “1”
PFSDO bit
ALC
(Volume)
1-band
EQ
PFVOL
PFDAC1-0 bits
PMDAC bit
DVOL
SMUTE
DAC
SDTO
(1) ADC: Includes the Digital Filter (LPF) for ADC as shown in “Filter Characteristics”.
(2) HPF1: High Pass Filter (HPF) for ADC as shown in “Digital HPF1”.
(3) HPF2: High Pass Filter. (See “Digital Programmable Filter Circuit”)
(4) LPF: Low Pass Filter (See “Digital Programmable Filter Circuit”)
(5) 4 Band EQ: Applicable for use as Equalizer or Notch Filter.
(See “Digital Programmable Filter Circuit”)
(6) ALC (Volume): Digital Volume with ALC Function.
(See “Input Digital Volume (Manual Mode)” and “ALC Operation”)
(7) 1 Band EQ: Applicable for use as Notch Filter (See “Digital Programmable Filter Circuit”)
(8) PFVOL: Sidetone digital volume (See “Sidetone digital Volume”)
(9) DVOL: Digital volume for playback path (See “Output Digital Volume”)
(10) SMUTE: Soft mute function (See “Soft Mute”)
Figure 39. Digital Block Path Select
015010680-E-00
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2015/09