AK4646EZ Datasheet, PDF (32/78 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/SPK-AMP

[AK4646EZ]
■ 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
ADC
SDTI
HPFAD bit
1st Order
HPF
SW1
“1” “0”
PMADL bit
PMADR bit
PMDAC bit
DAFIL bit
HPF bit
1st Order
HPF
LPF bit
1st Order
LPF
FIL3 bit
Stereo
Separation
EQ0 bit
GN1-0 bits
Gain
Compensation
Digital
Programmable
Filter Block
EQ5-1 bit
5 Band
EQ
ALC1/2 bits
SDTO
ALC
(Volume)
“1” “0”
PMDAC bit
SW2
DATT
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
MS0630-E-00
- 32 -
2007/06