AK4951EG Datasheet, PDF (18/30 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/HP/SPK-AMP

[AK4951]
■ Filter Characteristics
(Ta =25C; fs=48kHz; AVDD=2.8  3.5V, SVDD=1.8 ~ 5.5V, DVDD = 1.6 ~ 1.98V, TVDD = 1.6 or
(DVDD-0.2) 3.5V)
Parameter
Symbol
min
typ
max
Unit
ADC Digital Filter (Decimation LPF):
Passband (Note 26)
0.16dB
PB
0
-
18.8
kHz
0.66dB
-
21.1
-
kHz
1.1dB
-
21.7
-
kHz
6.9dB
-
24.1
-
kHz
Stopband (Note 26)
SB
28.4
-
-
kHz
Passband Ripple
PR
-
-
0.16
dB
Stopband Attenuation
SA
73
-
-
dB
Group Delay (Note 27)
GD
-
17
-
1/fs
Group Delay Distortion
GD
-
0
-
s
ADC Digital Filter (HPF): HPFC1-0 bits = “00”
Frequency Response
3.0dB
FR
-
3.7
-
Hz
(Note 26)
0.5dB
-
10.9
-
Hz
0.1dB
-
23.9
-
Hz
DAC Digital Filter (LPF):
Passband (Note 26)
0.05dB
PB
0
-
21.8
kHz
6.0dB
-
24
-
kHz
Stopband (Note 26)
SB
27.0
-
-
kHz
Passband Ripple
PR
-
-
0.05
dB
Stopband Attenuation
SA
70
-
-
dB
Group Delay (Note 27)
GD
-
29
-
1/fs
DAC Digital Filter (LPF) + SCF:
Frequency Response: 0  20.0kHz
FR
-
1.0
-
dB
Note 26. The passband and stopband frequencies scale with fs (sampling frequency).
Note 27. A calculating delay time which is 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. For
the signal through the programmable filters (Microphone Sensitivity Correction + Automatic Wind
Noise Reduction Filter + 1st order HPF + 1st order LPF + Stereo Separation Emphasis + 4-band
Equalizer + ALC + 1-band Equalizer), the group delay is increased by 4/fs from the value above in
both recording and playback modes if there is no phase change by the IIR filter.
014004561-E-00-PB
- 18 -
2014/08