
ASAHI KASEI
[AK4640]
MS0273-E-00
2004/03
- 14 -
FILTER CHARACTERISTICS
(Ta=
10
~
70
°
C; AVDD, DVDD, PVDD, HVDD=2.4
~
3.6V; fs=44.1kHz; DEM=OFF)
Parameter
ADC Digital Filter (Decimation LPF):
Passband
(Note 20)
±
0.1dB
1.0dB
3.0dB
Stopband
Passband Ripple
Stopband Attenuation
Group Delay
(Note 21)
Group Delay Distortion
ADC Digital Filter (HPF):
Frequency Response (Note 20)
3.0dB
0.5dB
0.1dB
DAC Digital Filter:
Passband
(Note 20)
±
0.1dB
0.7dB
6.0dB
Stopband
Passband Ripple
Stopband Attenuation
Group Delay
(Note 21)
DAC Digital Filter + SCF:
Frequency Response: 0
~
20.0kHz
BOOST Filter:
(Note 22)
MIN
20Hz
100Hz
1kHz
MID
20Hz
100Hz
1kHz
MAX
20Hz
100Hz
1kHz
Note 20. The passband and stopband frequencies scale with fs (system sampling rate).
For example, ADC is PB=0.454*fs (@-1.0dB), DAC is PB=0.454*fs (@-0.01dB).
Note 21. The calculated delay time caused by digital filtering. This time is from the input of analog signal to setting of the
16bit data of both channels from the input register to the output register of the ADC. This time includes the group
delay of the HPF. For the DAC, this time is from setting the 16bit data of both channels from the input register to
the output of analog signal.
Note 22. These frequency responses scale with fs. If a high-level and low frequency signal is input, the analog output clips
to the full-scale.
Symbol
min
typ
max
Units
PB
SB
PR
SA
GD
GD
0
-
-
-
17.4
-
-
-
±
0.1
-
-
-
kHz
kHz
kHz
kHz
dB
dB
1/fs
μ
s
20.0
21.1
-
-
-
17.0
0
25.7
-
65
-
-
FR
-
-
-
3.4
10
22
-
-
-
Hz
Hz
Hz
PB
SB
PR
SA
GD
0
-
-
-
19.6
-
-
-
±
0.01
-
-
kHz
kHz
kHz
kHz
dB
dB
1/fs
20.0
22.05
-
-
-
16.8
25.2
-
59
-
FR
-
±
1.0
-
dB
FR
FR
FR
-
-
-
-
-
-
-
-
-
5.74
2.92
0.0
5.94
4.71
0.14
16.04
10.55
0.3
-
-
-
-
-
-
-
-
-
dB
dB
dB
dB
dB
dB
dB
dB
dB
Frequency Response