AK7750 Datasheet, PDF (16/77 Pages) Asahi Kasei Microsystems – Audio DSP with Built-in Hands-Free Phone Features

[ASAHI KASEI]
[AK7750]
(4) Digital filter characteristics
Listed values are copied as reference data from the designed values and are not the guaranteed values.
They are guaranteed-by-design after passing the IC tester’s digital functional test..
4-1) ADC Section :
(Ta=25°C; AVDD,DVDD =3.0~3.6V; fs=48kHz; HPF=off
parameter
Min
Pass band (±0.005dB) note2)
PB
0
(-6dB)
-
Note 1)
Typ
24.0
Stop band
SB
26.5
Pass band ripple Note 2)
PR
Stop band attenuation Note 3, 4)
SA
80
Group delay distortion
∆GD
Group delay (Ts=1/fs)
GD
29.3
Max
21.5
-
±0.005
0
Units
kHz
kHz
kHz
kHz
dB
dB
µs
Ts
Note:
1. These frequencies scale with sampling frequency (fs). Not include HPF response.
2. The pass band is from DC to 21.5kHz when fs = 48kHz.
3. The stop band is from 26.5kHz to 3.0455MHz when fs = 48kHz.
4. When fs = 48kHz, the analog modulator samples analog input at 3.072MHz.
The digital filter does not attenuate the input signal in the multiple bands (n x 3.072MHz ± 21.99kHz;
n=0, 1, 2, 3...) of the sampling frequency.
[MS0296-E-00]
16
2005/03