[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
SDTI
ADC
1st Order
HPFAD bit
HPF
“1”
“0”
ADCPF bit
PMPFIL bit
HPF bit
1st Order
HPF
1st Order
LPF bit
LPF
5 Band
EQ5-1 bits
EQ
ALC
(Volume)
“0”
“1”
“1”
“0”
PFSDO bit
PFDAC bit
PMDAC bit
DATT
SDTO
SMUTE
DAC
(1) ADC: Include a Digital Filter (LPF) for ADC as shown in “FILTER CHRACTERISTICS”.
(2) DAC: Include a Digital Filter (LPF) for DAC as shown in “FILTER CHRACTERISTICS”.
(3) HPF: High Pass Filter. Applicable to use as Wind-Noise Reduction Filter. (See “Programmable Filter”.)
(4) LPF: Low Pass Filter (See “Digital Programmable Filter”.)
(5) 5-Band EQ: Applicable to use as Equalizer or Notch Filter. (See “Digital Programmable Filter”.)
(6) ALC: Input Digital Volume with ALC function. (See “Input Digital Volume” and “ALC”.)
(7) DATT: 4-step Digital Volume for recording path. (See “Digital Volume 2”)
(8) SMUTE: Soft mute. (See “Soft Mute”.)
Figure 35. Digital Block Path Select
MS0983-E-00
2008/07
- 37 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
