AK4649 Datasheet, PDF (38/96 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK-AMP

[AK4649]
■ Digital Block
The digital block consists of the blocks shown in Figure 30. Recording path and playback path is selected by setting
ADCPF bit, PFDAC bit and PFSDO bit. (Figure 31 ~ Figure 34, Table 23)
PMADL/R bit
ADC
SDTI
HPFAD bit
1st Order
HPF1
ADCPF bit
“1” “0”
PMPFIL bit
HPF bit
1st Order
HPF2
LPF bit
1st Order
LPF
FIL3 bit
Stereo
Separation
EQ0 bit
GN1-0 bits
Gain
Compensation
EQ5-2 bit
4 Band
EQ
ALC1/2 bits
ALC
(Volume)
EQ1 bit
“0” “1”
PFSDO bit
SDTO
1 Band
EQ
“1” “0”
PMDAC bit
PFDAC bit
DATT
SMUTE
DAC
(1) ADC: Include the Digital Filter (LPF) for ADC as shown in “FILTER CHRACTERISTICS”.
(2) HPF1: Include the Digital Filter (HPF) for ADC as shown in “FILTER CHRACTERISTICS”.
(3) DAC: Include the Digital Filter (LPF) for DAC as shown in “FILTER CHRACTERISTICS”.
(4) HPF2: High Pass Filter. Applicable for use as Wind-Noise Reduction Filter. (See “Digital Programmable Filter
Circuit”)
(5) LPF: Low Pass Filter (See “Digital Programmable Filter Circuit”)
(6) Stereo Separation: Digital Separation Emphasis Filter (See “Digital Programmable Filter Circuit”)
(7) Gain Compensation: Composed of the Equalizer (EQ0) and the Gain (0dB/+12dB/+24dB). Compensate the
frequency response and the gain after the Stereo Separation Emphasis Filter.
(8) 4 Band EQ: Applicable for use as Equalizer or Notch Filter. (See “Digital Programmable Filter Circuit”)
(9) Volume: Input Digital Volume with ALC function. (See “Input Digital Volume” and “ALC Operation”)
(10) 1 Band EQ: Applicable for use as Equalizer or Notch Filter. (See “Digital Programmable Filter Circuit”)
(11) DATT: Digital volume for playback path (See “Output Digital Volume2” )
(12) SMUTE: Digital volume with soft mute function (See “Output Digital Volume3”)
Figure 30. Digital Block Path Select
MS1023-E-01
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2010/08