ak4564 AKM Semiconductor, Inc., ak4564 Datasheet - Page 37

• Manufacturer Part Number: ak4564
• Description: 16bit Codec With Built-in Alc And Mic/hp/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
Filter Select 1
MS0140-E-01
Addr
04H
FSF: Select sampling rate to match a coefficient of digital filter
HPF1: Select cut-off frequency of HPF1 in EQ block. This is 1
HPF2: Select cut-off frequency of HPF2 to revise frequency response. This is 1
HPF3: Select cut-off frequency of HP3 for wind-noise cut. This is 2
MIX1-0: Select Mixing value in EQ block. When HPF1 is OFF, this circuit is also OFF.
Filter Select 1
0: fs = 48kHz (Default)
1: fs = 32kHz
0: OFF (Default)
1: ON
fixed to 400Hz and is changed by FSF bit.
Default
Register Name
MIX1
Table 10. Select cut-off frequency of HPF2
Table 9. Select cut-off frequency of HPF1
HPF1-1
HPF2-1
D7
0
MIX1
0
0
1
1
0
0
1
1
0
0
1
1
Table 11. Select Mixing value
MIX0
D6
0
HPF1-0
HPF2-0
MIX0
0
1
0
1
0
1
0
1
0
1
0
1
- 37 -
HPF3
D5
0
fs=32kHz
fs=32kHz
7.5kHz
100Hz
200Hz
300Hz
Main : Sub
6kHz
9kHz
st
OFF
OFF
HPF2-1
Cut-off Frequency
Cut-off Frequency
1: 1.25
1: 0.75
order and IIR filter.
1: 0.5
1: 1
D4
0
nd
order and IIR filter. The cut-off frequency is
HPF2-0
fs=48kHz
fs=48kHz
7.5kHz
D3
100Hz
200Hz
300Hz
6kHz
9kHz
0
OFF
OFF
Default
st
order and IIR filter.
HPF1-1
D2
0
Default
Default
HFP1-0
D1
0
[AK4564]
2002/07
FSF
D0
0