AK7746 Datasheet, PDF (12/62 Pages) Asahi Kasei Microsystems – Audio DSP with 5-channel 24-bit ADC and Input Mux

[ASAHI KASEI]
[AK7746]
(4) Digital Filter Characteristics
Values described below are design values cited as references.
1) ADC Section (ADC1, ADC2):
(Ta=25°C; AVDD, DVDD =3.0V~3.6V; fs=48 kHz; HPF=off (Note1))
Parameter
Symbol
min
typ
max
Unit
Digital filter
Pass band
(±0.005dB) Note 2)
PB
0
21.5
kHz
(-0.02dB)
-
21.768
-
kHz
(-6.0dB)
-
24.00
-
kHz
Stop band
SB
26.5
kHz
Pass band ripple
(Note 2)
PR
±0.005
dB
Stop band attenuation
(Note3,4)
SA
80
dB
Group delay distortion
∆GD
0
us
Group delay
(Ts=1/fs)
GD
29.3
Ts
Digital filter + SFC
Amplitude characteristics (0~20.0kHz)
±0.01
dB
Note 1) HPF response is not included
Note 2) The passband is from DC to 21.5 kHz when fs = 48 kHz.
Note 3) The stopband is from 26.5 kHz to 3.0455MHz when fs = 48 kHz.
Note 4) When fs = 48 kHz, the analog modulator samples the analog input at 3.072MHz. The input signal is not attenuated by
the digital filter in the multiple bands (n x 3.072MHz ± 21.99kHz; n=0, 1, 2, 3...) of the sampling frequency.
2) Monaural ADC Section (ADCM):
(Ta=25°C; AVDD, DVDD =3.0V~3.6V; fs=48 kHz; HPF=off (Note1))
Parameter
Symbol
min
typ
max
Unit
Digital filter
Pass band
(±0.005dB) Note 2)
PB
0
21.5
kHz
(-0.02dB)
-
21.768
-
kHz
(-6.0dB)
-
24.00
-
kHz
Stop band
SB
26.5
kHz
Pass band ripple
(Note 2)
PR
±0.005
dB
Stop band attenuation
(Note3,4)
SA
80
dB
Group delay distortion
∆GD
0
us
Group delay
(Ts=1/fs)
GD
29.3
Ts
Digital filter + SFC
Amplitude characteristics (0~20.0kHz)
±0.1
dB
Note 1) HPF response is not included
Note 2) The passband is from DC to 21.5 kHz when fs = 48 kHz.
Note 3) The stopband is from 26.5 kHz to 3.0455MHz when fs = 48 kHz.
Note 4) When fs = 48 kHz, the analog modulator samples the analog input at 3.072MHz. The input signal is not attenuated by
the digital filter in the multiple bands (n x 3.072MHz ± 21.99kHz; n=0, 1, 2, 3...) of the sampling frequency.
[MS0369-E00]
- 12 -
2004/12