AK4637EN Datasheet, PDF (14/96 Pages) Asahi Kasei Microsystems – 24bit Mono CODEC with MIC/SPK-AMP

[AK4637]
■ Filter Characteristics
(Ta=25C; fs=48kHz; AVDD=2.85.5V, DVDD=1.6~1.98V, TVDD=1.6 or (DVDD-0.2)3.6V)
Parameter
Symbol
Min.
Typ.
Max.
Unit
ADC Digital Filter (Decimation LPF):
Passband (Note 19)
0.16dB
PB
0.66dB
1.1dB
0
-
18.8
kHz
-
21.1
-
kHz
-
21.7
-
kHz
Stopband (Note 19)
6.9dB
SB
-
24.1
28.4
-
-
kHz
-
kHz
Passband Ripple
Stopband Attenuation
PR
-
SA
73
-
0.16
dB
-
-
dB
Group Delay (Note 20)
GD
-
17
-
1/fs
Group Delay Distortion
GD
-
0
-
s
ADC Digital Filter (HPF): HPFC1-0 bits = “00”
Frequency Response
3.0dB
FR
(Note 19)
0.5dB
0.1dB
-
3.7
-
Hz
-
10.9
-
Hz
-
23.9
-
Hz
DAC Digital Filter (LPF):
Passband 0.006dB ~ +0.076dB
PB
0
-
21.9
kHz
(Note 19) 6.0dB
Stopband (Note 19)
-
24
SB
26.2
-
-
kHz
-
kHz
Passband Ripple
PR
-0.006
-
+0.076
dB
Stopband Attenuation
SA
70
-
-
dB
Group Delay (Note 20)
GD
-
27
-
1/fs
DAC Digital Filter (LPF) + SCF:
Frequency Response: 0  20.0kHz
FR
-
1.0
-
dB
Note 19. The passband and stopband frequencies scale with fs (sampling frequency).
Note 20. 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 (1st order HPF + 1st order LPF +
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.
015010680-E-00
- 14 -
2015/09