AK4950 Datasheet, PDF (39/106 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP & mini DSP

[AK4950]
■ Digital Block
The digital block consists of the blocks shown in Figure 32. Recording path and playback path is selected by setting
ADCPF bit, PFDAC bit and PFSDO bit. (Figure 33 ~ Figure 36, Table 25)
PMADL/R bit
ADC
HPFAD bit
1st Order
HPF1
“1” “0”
ADCPF bit
SDTI
PMPFIL bit
MIC Sensitivity Compensation
HPF bit
1st Order
HPF2
LPF bit
1st Order
LPF
FIL3 bit
Stereo
Separation
EQ0 bit
GN1-0 bits
Gain
Compensation
EQ4-2 bit
3 Band
EQ
ALC bits
ALC
(Volume)
EQ1 bit
“0” “1”
PFSDO bit
1 Band
EQ
“1” “0”
PFDAC bit
DVOL DVOL7-0 bits
SDTO
: DSP Block
SMUTE SMUTE bit
PMDAC bit
Mono/Stero
Switch
MONO1-0 bits
De-emphasis DEM1-0 bits
DAC
(1) ADC: Includes the Digital Filter (LPF) for ADC as shown in “FILTER CHRACTERISTICS”.
(2) HPF1: High Pass Filter (HPF) for ADC as shown in “FILTER CHRACTERISTICS”.
(3) MIC Sensitivity Compensation: MIC volume control between L and R channels. (See “MIC Sensitivity
Compensation”)
(4) DAC: Includes the Digital Filter (LPF) for DAC as shown in “FILTER CHRACTERISTICS”.
(5) HPF2: High Pass Filter. Applicable for use as Wind-Noise Reduction Filter. (See “Digital Programmable Filter
Circuit”)
(6) LPF: Low Pass Filter (See “Digital Programmable Filter Circuit”)
(7) Stereo Separation: Stereo separation emphasis filter. (See “Digital Programmable Filter Circuit”)
(8) Gain Compensation: Gain compensation consists of EQ and Gain control. It corrects frequency characteristics after
stereo separation emphasis filter. (See “Digital Programmable Filter Circuit”)
(9) 3 Band EQ: Applicable for use as Equalizer or Notch Filter. (See “Digital Programmable Filter Circuit”)
(10) Volume: Digital volume control with ALC function. (See “Input Digital Volume” and “ALC Operation”)
(11) 1 Band EQ: Applicable for use as Equalizer or Notch Filter. (See “Digital Programmable Filter Circuit”)
(12) DVOL: Digital volume for playback path (See “Output Digital Volume2” )
(13) SMUTE: Soft mute function
(14) Mono/Stereo Switching: Mono/Stereo lineout outputs select from DAC which described in <Mono Mixing Output>
at “Stereo Line Outputs”.
(15) De-emphasis: De-emphasis filter (See “De-emphasis Filter Control”)
Figure 32. Digital Block Path Select
MS1320-E-00
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2011/10