AK7754 Datasheet, PDF (15/26 Pages) Asahi Kasei Microsystems – Audio DSP with Stereo CODEC + MIC/HP-AMP

[AK7754]
DIGITAL FILTER CHARACTERISTICS
■ ADC Block
1. fs=8kHz
(Ta=-20ºC~85ºC, AVDD= HVDD=DVDD=3.0~3.6V, DVDD18=1.7~1.9V, VSS1=VSS2=VSS3=VSS4=0V; fs=8 kHz;
Note 23)
Parameter
Symbol
min
typ
max
Unit
Passband (±0.1dB)
(Note 24)
PB
0
3.15
kHz
(-1.0dB)
3.63
kHz
(-3.0dB)
3.83
kHz
Stopband
SB
4.66
kHz
Passband Ripple
(Note 24)
PR
±0.1
dB
Stopband Attenuation (Note 25, Note 26)
SA
68
dB
Group Delay Distortion
ΔGD
0
μs
Group Deley
(Ts=1/fs)
GD
16
Ts
Note 23. Frequencies of each amplitude characteristics are in proportion to fs (sampling rate). The characteristic of the
high pass filter is not included.
Note 24. The passband is from DC to 3.15kHz when fs=8kHz.
Note 25. The stopband is 4.66kHz to 507.34kHz when fs=8kHz.
Note 26. When fs = 8kHz, the analog modulator samples the input signal at 512kHz.
2. fs=48kHz
(Ta=-20ºC~85ºC, AVDD=HVDD=DVDD=3.0~3.6V, DVDD18=1.7~1.9V, VSS1=VSS2=VSS3=VSS4=0V; fs=48
kHz; Note 27)
Parameter
Symbol
min
typ
max
Unit
Passband (±0.1dB) (Note 28)
PB
0
18.9
kHz
(-0.2dB)
20.0
kHz
(-3.0dB)
23.0
kHz
Stopband
SB
28.0
kHz
Passband Ripple
(Note 28)
PR
±0.04
dB
Stopband Attenuation (Note 29,Note 30)
SA
68
dB
Group Delay Distortion
ΔGD
0
μs
Group Delay
(Ts=1/fs)
GD
16
Ts
Note 27. Frequencies of each amplitude characteristics are in proportion to fs (sampling rate).
Note 28. The passband is from DC to 18.9kHz when fs=48kHz.
Note 29. The stopband is 28kHz to 3.044MHz when fs=48kHz.
Note 30. When fs = 48kHz, the analog modulator samples the input signal at 3.07MHz.
MS1138-E-01-PB
15
2012/03