ASAHI KASEI
[AK4651]
FILTER CHARACTERISTICS
(Ta=25°C; AVDD, HVDD, DVDD=2.7 ∼ 3.6V; fs=48kHz; DEM=OFF)
Parameter
Symbol
min
typ
max
Units
ADC Digital Filter (Decimation LPF):
Passband (Note 29)
PB
0
-
-
-
18.9
-
-
-
kHz
kHz
kHz
kHz
dB
dB
1/fs
µs
±0.1dB
−1.0dB
−3.0dB
21.8
23.0
-
-
-
Stopband
Passband Ripple
Stopband Attenuation
Group Delay (Note 30)
Group Delay Distortion
SB
PR
SA
GD
∆GD
29.4
-
65
-
±0.1
-
-
-
17.0
0
-
ADC Digital Filter (HPF):
Frequency Response (Note 29)
FR
-
-
1.0
6.5
-
-
Hz
Hz
−3.0dB
−0.1dB
DAC Digital Filter:
Passband (Note 29)
PB
0
-
21.3
-
-
±0.01
-
-
kHz
kHz
kHz
dB
dB
1/fs
±0.1dB
−6.0dB
-
25.2
-
59
-
24.0
-
-
-
Stopband
Passband Ripple
SB
PR
SA
GD
Stopband Attenuation
Group Delay (Note 30)
DAC Digital Filter + SCF:
Frequency Response: 0 ∼ 20.0kHz
BOOST Filter: (Note 31)
16.8
FR
FR
-
-
dB
±1.0
Frequency Response
MIN
20Hz
100Hz
1kHz
20Hz
100Hz
1kHz
-
-
-
-
-
-
-
-
-
5.80
3.17
0.03
10.85
7.23
0.18
16.14
11.05
0.47
-
-
-
-
-
-
-
-
-
dB
dB
dB
dB
dB
dB
dB
dB
dB
MID
FR
FR
MAX 20Hz
100Hz
1kHz
Note 29. The passband and stopband frequencies scale with fs (system sampling rate).
For example, ADC is PB=0.454 × fs (@−1.0dB). The reference frequency of these responses is 1kHz.
Note 30. The calculated delay time caused by digital filtering. This time is from the input of analog signal to setting of the
16-bit 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 16-bit data of both channels from the input
register to the output of analog signal.
Note 31. These frequency responses scale with fs. If a high-level and low frequency signal is input, the analog output clips
to the full-scale.
MS0503-E-00
2006/04
- 13 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
