ASAHI KASEI
[AK4527B]
FILTER CHARACTERISTICS
(Ta=25°C; AVDD, DVDD=4.5∼5.5V; TVDD=2.7∼5.5V; fs=44.1kHz; DEM=OFF)
Parameter
Symbol
min
typ
ADC Digital Filter (Decimation LPF):
Passband
(Note 16) -0.005dB
PB
0
-0.02dB
-
20.02
-0.06dB
-
20.20
-6.0dB
-
22.05
Stopband
SB
24.34
Passband Ripple
PR
Stopband Attenuation
SA
80
Group Delay
(Note 17)
GD
27.6
Group Delay Distortion
0
∆GD
ADC Digital Filter (HPF):
Frequency Response
(Note 16) -3dB
FR
0.9
-0.5dB
2.7
-0.1dB
6.0
DAC Digital Filter:
Passband
(Note 16) -0.1dB
PB
0
-6.0dB
-
22.05
Stopband
SB
24.2
Passband Ripple
PR
Stopband Attenuation
SA
56
Group Delay
(Note 17)
GD
21.9
DAC Digital Filter + Analog Filter:
FR
Frequency Response:
0
∼
20.0kHz
±0.2
FR
40.0kHz (Note 18)
±0.3
max
19.76
-
-
-
±0.005
Units
kHz
kHz
kHz
kHz
kHz
dB
dB
1/fs
µs
Hz
Hz
Hz
20.0
-
±0.02
kHz
kHz
kHz
dB
dB
1/fs
dB
dB
Notes: 16. The passband and stopband frequencies scale with fs.
For example, 20.02kHz at –0.02dB is 0.454 x fs. The reference frequency of these responses is 1kHz.
17. The calculating delay time which occurred by digital filtering. This time is from setting the input of analog
signal to setting the 24bit data of both channels to the output register for ADC.
For DAC, this time is from setting the 20/24bit data of both channels on input register to the output of analog
signal.
18. fs=96kHz.
MS0056-E-00
-9-
2000/10
AKM [ ASAHI KASEI MICROSYSTEMS ]
