ASAHI KASEI
[AK4641]
FILTER CHARACTERISTICS (16bit Mono CODEC)
(Ta=−10
∼
70°C; AVDD, DVDD, BVDD=2.6
∼
3.6V; Bfs=8kHz)
Parameter
Symbol
min
typ
ADC Digital Filter (Decimation LPF):
Passband
(Note 16)
PB
0
-
±0.1dB
-
3.6
−1.0dB
-
3.8
−3.0dB
Stopband
SB
4.7
-
Passband Ripple
PR
-
-
Stopband Attenuation
SA
68
-
Group Delay
(Note 17)
GD
-
17.0
Group Delay Distortion
-
0
∆GD
ADC Digital Filter (HPF):
Frequency Response
FR
-
0.62
−3.0dB
(Note 16)
-
1.81
−0.5dB
-
3.99
−0.1dB
DAC Digital Filter:
Passband
(Note 16)
PB
0
-
±0.1dB
-
3.6
−0.7dB
-
4.0
−6.0dB
Stopband
SB
4.6
-
Passband Ripple
PR
-
-
Stopband Attenuation
SA
59
-
Group Delay
(Note 17)
GD
-
15.8
DAC Digital Filter + SCF:
FR
-
Frequency Response: 0
∼
20.0kHz
±1.0
max
3.1
-
-
-
±0.1
-
-
-
-
-
-
3.6
-
-
-
±0.01
-
-
-
Units
kHz
kHz
kHz
kHz
dB
dB
1/Bfs
µs
Hz
Hz
Hz
kHz
kHz
kHz
dB
dB
1/Bfs
dB
Note 16. The passband and stopband frequencies scale with fs (system sampling rate).
For example, ADC is PB=0.454*Bfs (@-1.0dB), DAC is PB=0.454*Bfs (@-0.01dB).
Note 17. 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.
MS0301-E-00
-9-
2004/05
AKM [ ASAHI KASEI MICROSYSTEMS ]
