AK4634 Datasheet, PDF (37/77 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

[AK4634]
■ Digital Block
The digital block consists of block diagram as shown in Figure 35. The AK4634 can choose various signal processing on
a recording path or a playback path by setting ADCPF bit, PFDAC bit and PFSDO bit. (Figure 35 - Figure 38, Table 21)
PMADC bit
ADC
SDTI
HPFAD bit
1st Order
HPF
PMPFIL bit
HPF bit
LPF bit
EQ5-1 bits
“1” “0”
ADCPF bit
1st Order
HPF
1st Order
LPF
5 Band
EQ
“0” “1”
PFSDO bit
SDTO
ALC
(Volume)
“1” “0”
PMDAC bit
PFDAC bit
DATT
SMUTE
DAC
(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
Circuit”.)
(4) LPF: Low Pass Filter (See “Digital Programmable Filter Circuit”.)
(5) 5-Band EQ: Applicable to use as Equalizer or Notch Filter. (See “Digital Programmable Filter Circuit”.)
(6) ALC: Input Digital Volume with ALC function. (See “Input Digital Volume” and “ALC Operation”.)
(7) DATT: 4-step Digital Volume for recording path. (See “Output Digital Volume 2”)
(8) SMUTE: Soft mute. (See “SOFT MUTE”.)
Figure 35. Digital Block Path Select
Rev. 0.5
- 37 -
2007/10