AK7752 Datasheet, PDF (12/23 Pages) Asahi Kasei Microsystems – Audio/Hands Free DSP with Stereo CODEC

[AK7752]
(4) Digital Filter Characteristics
1) ADC Section:
(Ta= 25°C; AVDD, DVDD=3.0 ~ 3.6V; fs = 8kHz; Note 22)
Parameter
Symbol
min
typ
max
Passband (±0.1dB) (Note 23)
PB
0
(-1.0dB)
(-3.0dB)
3.15
3.63
3.83
Stopband
SB
4.66
Passband Ripple
(Note 23)
PR
±0.1
Stopband Attenuation (Note 24, Note 25) SA
65
Group Delay Distortion
GD
0
Group Delay
(Ts=1/fs)
GD
16.3
Note 22. HPF response is not included.
Note 23. The passband is from DC to 3.15kHz when fs = 8kHz.
Note 24. The stopband is from 4.66kHz to 507.34kHz when fs = 8kHz.
Note 25. When fs = 8 kHz, the analog modulator samples the analog input at 512kHz
Units
kHz
kHz
kHz
kHz
dB
dB
μs
Ts
2) DAC Section:
(Ta=25°C; AVDD, DVDD=3.0~3.6V; fs=8kHz)
Parameter
Symbol
min
Digital Filter
Passband (±0.1dB) (Note 26)
PB
0
(-6.0dB)
-
Stopband
(Note 26)
SB
4.57
Passband Ripple
PR
Stopband Attenuation
SA
59
Group Delay (Ts=1/fs) (Note 27)
GD
-
Digital Filter + SCF
Amplitude Characteristics 0~3.5kHz
typ
max
Units
3.5
kHz
4.0
-
kHz
kHz
±0.01
dB
dB
15
Ts
±0.5
dB
Note 26. The pass band and stop band frequencies are proportional to “fs” (system sampling rate), and represents
PB=0.4292fs (@-0.06dB) and SB=0.571fs, respectively.
Note 27. The digital filter’s delay is calculated as the time from setting 18 Bit data into the input register until an analog
signal is output.
MS0578-E-01-PB
- 12 -
2007/09