
ASAHI KASEI
AKM CONFIDENTIAL
[AK4566]
REV 0.5
2002/2
- 8 -
FILTER CHARACTERISTICS
(Ta=25
°
C; AVDD, DVDD, HVDD=2.5
~
3.6V; fs=44.1kHz; DEM=OFF; BOOST=OFF)
Parameter
ADC Digital Filter (LPF):
Passband (Note 15)
±
0.1dB
-1.0dB
-3.0dB
Stopband (Note 15)
Passband Ripple
Stopband Attenuation
Group Delay (Note 16)
Group Delay Distortion
ADC Digital Filter (HPF):
Frequency Response (Note 15)
-3dB
-0.5dB
-0.1dB
DAC Digital Filter:
(Note 14)
Passband (Note 15)
±
0.01dB
6.0dB
Stopband (Note 15)
Passband Ripple
Stopband Attenuation
Group Delay (Note 16)
Group Delay Distortion
DAC Digital Filter + Analog Filter:
(Note 14)(Note 17)
Frequency Response 0
~
20.0kHz
BOOST Filter:
(Note 17) (Note 18)
20Hz
100Hz
1kHz
20Hz
100Hz
1kHz
20Hz
100Hz
1kHz
Note 14. BOOST OFF (BST1-0 = “00”)
Note 15. The passband and stopband frequencies scale with fs.
For example (DAC), PB=0.4535*fs(@
±
0.05dB), SB=0.546*fs(@-43dB).
Note 16. This is the calculated delay time caused by digital filtering. This time is measured from the input of analog signal
to setting the 20 bit data of both channels on input register to the output register of ADC. This time also includes
group delay of HPF. For DAC, this time is from setting the 20 bit data of both channels on input register to the
output of analog signal.
Note 17. DACL
à
HPL, DACR
à
HPR, DACL/R
à
MOUT.
Note 18. These frequency responses scale with fs. If high-level signal is input, the AK4566 clips at low frequency.
Symbol
min
typ
max
Units
PB
0
-
-
20.0
21.1
17.0
0
17.4
-
-
±
0.1
-
kHz
kHz
kHz
kHz
dB
dB
1/fs
μ
s
SB
PR
SA
GD
GD
27.0
65
-
FR
3.4
10
22
Hz
Hz
Hz
PB
0
-
22.05
16.8
0
20.0
-
±
0.06
-
kHz
kHz
kHz
dB
dB
1/fs
μ
s
SB
PR
SA
GD
GD
24.1
43
-
FR
-
±
0.5
-
dB
MIN
FR
-
-
-
-
-
-
-
-
-
5.74
2.92
0
5.94
4.71
0.14
16.04
10.55
0.3
-
-
-
-
-
-
-
-
-
dB
dB
dB
dB
dB
dB
dB
dB
dB
MID
FR
Frequency Response
MAX
FR