[AK4438]
9. Filter Characteristics (fs=48kHz)
(Ta= -40 +105C; AVDD =3.0 3.6V, TVDD=1.7 3.6V; DEM=OFF)
■ Sharp Roll-Off Filter (SD bit = “0”, SLOW bit = “0”)
fs=44.1kHz
Parameter
Symbol
Min.
Typ.
Max.
Unit
Digital Filter
0.05dB
3.0dB
(Note 12)
(Note 11)
(Note 14)
(Note 13)
PB
PB
PR
SB
SA
GD
0
20.0
kHz
kHz
dB
kHz
dB
Passband
(Note 11)
21.5
Passband Ripple
Stopband
Stopband Attenuation
Group Delay
-0.0032
0.0032
24.1
80
-
26.8
-
1/fs
Digital Filter + SCF + SMF (Note 14)
Frequency Response : 0 20.0kHz
-0.26
0.1
dB
fs=96kHz
Parameter
Digital Filter
0.05dB
Symbol
Min.
Typ.
Max.
Unit
PB
PB
PR
SB
SA
GD
0
43.5
kHz
kHz
dB
kHz
dB
Passband
(Note 11)
3.0dB
(Note 12)
(Note 11)
(Note 14)
(Note 13)
46.8
0
Passband Ripple
Stopband
Stopband Attenuation
Group Delay
-0.0032
0.0032
52.5
80
-
26.8
-
1/fs
Digital Filter + SCF + SMF (Note 14)
Frequency Response : 0 20.0kHz
-0.53
0.1
dB
fs=192kHz
Parameter
Digital Filter
0.05dB
Symbol
Min.
Typ.
Max.
Unit
PB
PB
PR
SB
SA
GD
0
87.0
kHz
kHz
dB
kHz
dB
Passband
(Note 11)
3.0dB
(Note 12)
(Note 11)
(Note 14)
(Note 13)
93.6
Passband Ripple
Stopband
Stopband Attenuation
Group Delay
-0.0032
0.0032
105
80
-
26.8
-
1/fs
Digital Filter + SCF + SMF (Note 14)
Frequency Response : 0 20.0kHz
-1.9
0.1
dB
Note 11. The pass band and stop band frequencies scale with fs. For example, PB=0.4535×fs,
SB=0.546×fs.
Note 12. It is the pass band gain amplitude of the double over sampling filter at the first step of the
Interpolator.
Note 13. The calculating delay time which occurred by digital filtering. This time is from setting the
16/20/24/32bit data of both channels to input register to the output of analog signal.
Note 14. The output level is assumed as 0dB when inputting a 1kHz 0dB sine wave.
*Digital filter characteristics are based on simulation results.
016001925-E-00
2016/03
- 9 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
