AK4950 Datasheet, PDF (12/106 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP & mini DSP

[AK4950]
FILTER CHARACTERISTICS
(Ta =25°C; AVDD=2.7 ∼ 3.6V, TVDD =1.6 ∼ 3.6V; fs=44.1kHz; DEM=OFF)
Parameter
Symbol
min
typ
max
Unit
ADC Digital Filter (Decimation LPF):
Passband (Note 24)
±0.16dB
PB
−0.66dB
0
-
17.3
kHz
-
19.4
-
kHz
−1.1dB
-
19.9
-
kHz
−6.9dB
-
22.1
-
kHz
Stopband (Note 24)
SB
26.1
-
-
kHz
Passband Ripple
PR
-
-
±0.1
dB
Stopband Attenuation
SA
73
-
-
dB
Group Delay (Note 25)
GD
-
19
-
1/fs
Group Delay Distortion
ΔGD
-
0
-
μs
ADC Digital Filter (HPF): HPFC1-0 bits = “00”
Frequency Response
−3.0dB
FR
-
3.4
-
Hz
−0.5dB
-
10
-
Hz
−0.1dB
-
22
-
Hz
DAC Digital Filter (LPF):
Passband (Note 24)
±0.05dB
PB
−6.0dB
0
-
20.0
kHz
-
22.05
-
kHz
Stopband (Note 24)
SB
24.1
-
-
kHz
Passband Ripple
PR
-
-
±0.02
dB
Stopband Attenuation
SA
54
-
-
dB
Group Delay (Note 25)
GD
-
20
-
1/fs
DAC Digital Filter (LPF) + SCF:
Frequency Response: 0 ∼ 20.0kHz
FR
-
±1.0
-
dB
Note 24. The passband and stopband frequencies scale with fs (system sampling rate). Each response refers to that of
1kHz. For example, it is 0.454 x fs (ADC) when PB=20.0kHz (@−1.0dB).
Note 25. A calculating delay time which induced by digital filtering. This time is from the input of an analog signal to the
setting of 24-bit data of both channels to the ADC output register. For the DAC, this time is from setting the
24-bit data of a channel from the input register to the output of analog signal. Group delay time is the same as the
value shown above even when a signal path that includes the programmable filters (1st order HPF + 1st order
LPF + 3-band Equalizer + ALC + Equalizer) is selected.
MS1320-E-00
- 12 -
2011/10