[AK4646]
■ Digital Block
The digital block consists of block diagram as shown in Figure 24. HPF ~ ALC blocks are used for recording path when
DAFIL bit = “0” and either ADC (Lch or Rch) is powered-up. Also HPF ~ ALC blocks are used for playback path when
DAFIL bit = “1” or both ADC (Lch and Rch) are powered-down (Figure 24 ~ Figure 27, Table 21). The SDTO pin
outputs “L” when DAFIL bit = “1”, even if ADC is powered-up.
PMADCL/R bit
SDTI
ADC
1st Order
HPFAD bit
HPF
SW1
“1”
“0”
PMADL bit
PMADR bit
PMDAC bit
DAFIL bit
1st Order
HPF
HPF bit
LPF bit
1st Order
LPF
Stereo
Separation
FIL3 bit
EQ0 bit
GN1-0 bits
Gain
Compensation
5 Band
EQ
EQ5-1 bit
Digital
Programmable
Filter Block
ALC
(Volume)
ALC1/2 bits
“1”
“0”
SW2
PMDAC bit
DATT
SDTO
SMUTE
DAC
SW1, SW2: see Table 21
(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 “Programmable Filter”)
(4) LPF: Low Pass Filter (See “Digital Programmable Filter”.)
(5) Stereo Separation: Digital Separation Emphasis Filter (See “Digital Programmable Filter”)
(6) Gain Compensation: Composed of the Equalizer (EQ0) and the Gain (0bB/+12dB/+24dB). Compensate the
frequency response and the gain after the Stereo Separation Emphasis Filter.
(7) 5-Band Notch: Applicable to use as Equalizer or Notch Filter. (See “Digital Programmable Filter”)
(8) ALC: Input Digital Volume with ALC function. (See “Input Digital Volume” and “ALC”)
(9) DATT: 4-band Digital Volume for recording path. (See “Digital Volume 2”)
(10)SMUTE: Soft mute. (See “Soft Mute”.)
Figure 24 Digital Block Path Select
MS0557-E-05
2011/01
- 32 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
