[AK4425A]
SHARP ROLL-OFF FILTER CHARACTERISTICS
(Ta = 25°C; VDD=AVDD = +4.5 ∼ +5.5V; fs = 44.1 kHz; DEM = OFF; SLOW = “0”)
Parameter
Digital filter
Passband
Symbol
min
typ
max
Units
PB
0
-
24.1
20.0
-
kHz
kHz
kHz
dB
dB
1/fs
±0.05dB (Note 11)
22.05
–6.0dB
Stopband (Note 11)
Passband Ripple
Stopband Attenuation
Group Delay (Note 12)
SB
PR
SA
GD
± 0.02
54
-
19.3
-
Digital Filter + LPF
Frequency Response 20.0kHz fs=44.1kHz
40.0kHz fs=96kHz
FR
FR
FR
-
-
-
-
-
-
dB
dB
dB
± 0.05
± 0.05
± 0.05
80.0kHz fs=192kHz
Note 11. The passband and stopband frequencies scale with fs(system sampling rate).
For example, PB=0.4535×fs (@±0.05dB), SB=0.546×fs.
Note 12. Calculated delay time caused by digital filter. This time is measured from setting the 16/24bit data
of both channels to input register to the output of the analog signal.
SLOW ROLL-OFF FILTER CHARACTERISTICS
(Ta = 25°C; VDD=AVDD = +4.5 ∼ +5.5V; fs = 44.1kHz; DEM = OFF; SLOW = “1”)
Parameter
Digital Filter
Passband
Symbol
min
typ
max
Units
±0.04dB (Note 13)
-3.0dB
PB
0
-
8.1
-
kHz
kHz
kHz
dB
18.2
Stopband
(Note 13)
SB
PR
SA
GD
39.2
Passband Ripple
Stopband Attenuation
Group Delay
± 0.005
72
-
dB
(Note 12)
19.3
-
1/fs
Digital Filter + LPF
Frequency Response
FR
FR
FR
-
-
-
+0/-5
+0/-4
+0/-5
-
-
-
dB
dB
dB
fs=44.kHz
fs=96kHz
fs=192kHz
20.0kHz
40.0kHz
80.0kHz
Note 13. The passband and stopband frequencies scale with fs(system sampling rate).
For example, PB=0.185×fs (@±0.04dB), SB=0.888×fs.
MS1127-E-01
2011/03
- 7 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
