ASAHI KASEI
[AK4367]
FILTER CHARACTERISTICS
(Ta=25°C; VDD, HVDD=2.2 ∼ 3.6V; fs=44.1kHz; De-emphasis = “OFF”)
Parameter
Symbol
min
typ
max
Units
DAC Digital Filter: (Note 10)
Passband
(Note 11)
(Note 11)
PB
0
-
24.1
-
54
-
-
20.0
-
-
kHz
kHz
kHz
dB
dB
1/fs
µs
−0.05dB
−6.0dB
22.05
-
-
-
20.8
0
Stopband
SB
PR
SA
GD
∆GD
Passband Ripple
Stopband Attenuation
Group Delay
±0.02
-
-
-
(Note 12)
Group Delay Distortion
-
DAC Digital Filter + Analog Filter: (Note 10) (Note 13)
Frequency Response
Analog Filter: (Note 14)
Frequency Response
FR
FR
FR
-
-
-
-
dB
dB
0 ∼ 20.0kHz
±0.5
±1.0
0 ∼ 20.0kHz
BOOST Filter:
Frequency Response
(Note 13) (Note 15)
20Hz
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
dB
dB
dB
dB
dB
dB
dB
dB
dB
5.76
2.92
0.02
10.80
6.84
0.13
16.06
10.54
0.37
MIN
100Hz
1kHz
20Hz
100Hz
1kHz
20Hz
FR
FR
MID
MAX 100Hz
1kHz
Note 10. BOOST OFF (BST1-0 bit = “00”)
Note 11. The passband and stopband frequencies scale with fs.
For example, PB=0.4535*fs(@±0.05dB), SB=0.546*fs(@−54dB).
Note 12. This is the calculated delay time caused by digital filtering. This time is measured from the setting of the 24bit
data of both channels to the input registers to the output of the analog signal.
Note 13. DAC Æ HPL, HPR, MOUT
Note 14. MIN Æ HPL/HPR/MOUT, LIN Æ HPL/MOUT, RIN Æ HPR/MOUT
Note 15. These frequency responses scale with fs. If high-level signal is input, the AK4367 clips at low frequency.
Boost Filter (fs=44.1kHz)
20
MAX
15
MID
10
MIN
5
0
-5
10
100
1000
10000
Frequency [Hz]
Figure 2. Boost Frequency (fs=44.1kHz)
MS0247-E-02
2005/10
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