ak4646 AKM Semiconductor, Inc., ak4646 Datasheet - Page 32

• Manufacturer Part Number: ak4646
• Description: Stereo Codec With Mic/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

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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.
(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
(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”.)
MS0557-E-02
Digital Block
frequency response and the gain after the Stereo Separation Emphasis Filter.
Digital
Programmable
Filter Block
Figure 24 Digital Block Path Select
PMADCL/R bit
HPFAD bit
PMADL bit
PMADR bit
PMDAC bit
DAFIL bit
SW1, SW2: see Table 21
SDTO
EQ0 bit
GN1-0 bits
1st Order
ALC1/2 bits
EQ5-1 bit
ADC
HPF
FIL3 bit
HPF bit
LPF bit
- 32 -
Compensation
Separation
PMDAC bit
1st Order
1st Order
“1”
(Volume)
Stereo
5 Band
SW1
HPF
LPF
ALC
Gain
EQ
“0”
SMUTE
“1”
DATT
DAC
“0”
SW2
SDTI
[AK4646]
2007/05