ak4634 AKM Semiconductor, Inc., ak4634 Datasheet - Page 37

• Manufacturer Part Number: ak4634
• Description: 16-bit Mono Codec With Alc & Mic/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

■
The digital block consists of block diagram as shown in
a recording path or a playback path by setting ADCPF bit, PFDAC bit and PFSDO bit.
(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
(4) LPF: Low Pass Filter (See
(5) 5-Band EQ: Applicable to use as Equalizer or Notch Filter. (See
(6) ALC: Input Digital Volume with ALC function. (See
(7) DATT: 4-step Digital Volume for recording path. (See
(8) SMUTE: Soft mute. (See
Rev. 0.5
Digital Block
Circuit”.)
“SOFT
“Digital Programmable Filter
PMADC bit
HPFAD bit
MUTE”.)
Figure 35. Digital Block Path Select
“0”
SDTO
1st Order
PMPFIL bit
“1”
ADC
HPF
PFSDO bit
EQ5-1 bits
HPF bit
LPF bit
Figure
- 37 -
“Input Digital
“Output Digital Volume
Circuit”.)
PMDAC bit
1st Order
1st Order
“1”
(Volume)
35. The AK4634 can choose various signal processing on
5 Band
HPF
ALC
LPF
EQ
“0”
ADCPF bit
“Digital Programmable Filter
SMUTE
“1”
DATT
Volume” and
DAC
“0”
PFDAC bit
SDTI
“Digital Programmable Filter
2”)
(Figure 35
“ALC
Operation”.)
-
Circuit”.)
Figure
38,
[AK4634]
Table
2007/10
21)