AK4640_05 Datasheet, PDF (14/78 Pages) Asahi Kasei Microsystems – 16-Bit ΔΣ CODEC with MIC/HP/SPK-AMP

ASAHI KASEI
[AK4640]
FILTER CHARACTERISTICS
(Ta=−10 ∼ 70°C; AVDD, DVDD, PVDD, HVDD=2.4 ∼ 3.6V; fs=44.1kHz; DEM=OFF)
Parameter
Symbol
min
typ
ADC Digital Filter (Decimation LPF):
Passband
(Note 20) ±0.1dB
PB
0
-
−1.0dB
-
20.0
−3.0dB
-
21.1
Stopband
SB
25.7
-
Passband Ripple
PR
-
-
Stopband Attenuation
SA
65
-
Group Delay
(Note 21)
GD
-
17.0
Group Delay Distortion
∆GD
-
0
ADC Digital Filter (HPF):
Frequency Response (Note 20) −3.0dB
FR
-
3.4
−0.5dB
−0.1dB
-
10
-
22
DAC Digital Filter:
Passband
(Note 20) ±0.1dB
PB
−0.7dB
0
-
-
20.0
−6.0dB
-
22.05
Stopband
SB
25.2
-
Passband Ripple
PR
-
-
Stopband Attenuation
SA
59
-
Group Delay
(Note 21)
GD
-
16.8
DAC Digital Filter + SCF:
Frequency Response: 0 ∼ 20.0kHz
FR
-
±1.0
BOOST Filter:
(Note 22)
Frequency Response MIN 20Hz
FR
-
5.74
100Hz
-
2.92
1kHz
-
0.0
MID 20Hz
FR
-
5.94
100Hz
-
4.71
1kHz
-
0.14
MAX 20Hz
FR
-
16.04
100Hz
-
10.55
1kHz
-
0.3
max
17.4
-
-
-
±0.1
-
-
-
-
-
-
19.6
-
-
-
±0.01
-
-
-
-
-
-
-
-
-
-
-
-
Units
kHz
kHz
kHz
kHz
dB
dB
1/fs
µs
Hz
Hz
Hz
kHz
kHz
kHz
kHz
dB
dB
1/fs
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
Note 20. The passband and stopband frequencies scale with fs (system sampling rate).
For example, ADC is PB=0.454*fs (@-1.0dB), DAC is PB=0.454*fs (@-0.01dB).
Note 21. 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.
Note 22. These frequency responses scale with fs. If a high-level and low frequency signal is input, the analog output clips
to the full-scale.
MS0273-E-02
- 14 -
2005/04