ASAHI KASEI
[AK4370]
FILTER CHARACTERISTICS
(Ta=25°C; AVDD, DVDD, HVDD=1.6 ∼ 3.6V; fs=44.1kHz; De-emphasis = “OFF”)
Parameter
Symbol
min
typ
max
Units
DAC Digital Filter: (Note 15)
Passband (Note 16)
PB
0
-
24.1
-
54
-
-
20.0
-
-
kHz
kHz
kHz
dB
dB
1/fs
µs
−0.05dB
−6.0dB
22.05
-
-
-
22
0
Stopband (Note 16)
Passband Ripple
Stopband Attenuation
Group Delay (Note 17)
Group Delay Distortion
SB
PR
SA
GD
ΔGD
±0.02
-
-
-
-
DAC Digital Filter + Analog Filter: (Note 15, Note 18)
Frequency Response
Analog Filter: (Note 19)
Frequency Response
FR
FR
FR
-
-
-
-
dB
dB
0 ∼ 20.0kHz
±0.5
±1.0
0 ∼ 20.0kHz
BOOST Filter: (Note 18, Note 20)
Frequency Response 20Hz
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
dB
dB
dB
dB
dB
dB
dB
dB
dB
5.76
2.92
0.02
10.80
6.84
0.13
16.06
10.54
0.37
MIN
100Hz
1kHz
20Hz
100Hz
1kHz
20Hz
FR
FR
MID
MAX 100Hz
1kHz
Note 15. BOOST OFF (BST1-0 bit = “00”)
Note 16. The passband and stopband frequencies scale with fs (system sampling rate).
For example, PB=0.4535fs(@−0.05dB). SB=0.546fs(@−54dB).
Note 17. This time is from setting the 24-bit data of both channels from the input register to the output of analog signal.
Note 18. DAC Æ HPL, HPR, LOUT, ROUT
Note 19. LIN1/LIN2/RIN1/RIN2 Æ HPL/HPR/LOUT/ROUT
Note 20. These frequency responses scale with fs. If high-level signal is input, the output clips at low frequency.
Boost Filter (fs=44.1kHz)
20
MAX
15
MID
10
MIN
5
0
-5
10
100
1000
10000
Frequency [Hz]
Figure 2. Boost Frequency (fs=44.1kHz)
MS0595-E-00
2007/03
- 9 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
