AK4648 Datasheet, PDF (20/119 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP/SPK-AMP

[AK4648]
FILTER CHARACTERISTICS
(Ta=25°C; AVDD, DVDD=2.6 ∼ 3.6V; TVDD=1.6 ∼ 3.6V; HVDD=2.6 ∼ 5.0V; fs=44.1kHz; DEM=OFF;
FIL1=FIL3=EQ=FBEQ=OFF)
Parameter
Symbol
min
typ
max
ADC Digital Filter (Decimation LPF):
Passband (Note 43)
±0.16dB
PB
0
-
17.3
−0.66dB
−1.1dB
-
19.4
-
-
19.9
-
−6.9dB
-
22.1
-
Stopband
SB
26.1
-
-
Passband Ripple
PR
-
-
±0.1
Stopband Attenuation
SA
73
-
-
Group Delay (Note 44)
GD
-
19
-
Group Delay Distortion
ΔGD
-
0
-
ADC Digital Filter (HPF): (Note 45)
Frequency Response (Note 43) −3.0dB
FR
-
0.9
-
−0.5dB
-
2.7
-
−0.1dB
-
6.0
-
DAC Digital Filter (LPF):
Passband (Note 43)
±0.1dB
PB
0
-
19.6
−0.7dB
−6.0dB
-
20.0
-
-
22.05
-
Stopband
SB
25.2
-
-
Passband Ripple
PR
-
-
±0.01
Stopband Attenuation
SA
59
-
-
Group Delay (Note 44)
GD
-
26
-
DAC Digital Filter (LPF) + SCF:
Frequency Response: 0 ∼ 20.0kHz
FR
-
±1.0
-
DAC Digital Filter (HPF): (Note 45)
Frequency Response (Note 43) −3.0dB
FR
-
0.9
-
−0.5dB
-
2.7
-
−0.1dB
-
6.0
-
Units
kHz
kHz
kHz
kHz
kHz
dB
dB
1/fs
μs
Hz
Hz
Hz
kHz
kHz
kHz
kHz
dB
dB
1/fs
dB
Hz
Hz
Hz
Note 43. The passband and stopband frequencies with fs (system sampling rate).
For example, DAC is PB=0.454*fs (@−0.7dB). Each response refers to that of 1kHz.
Note 44. The calculated delay time caused by digital filtering. This time is from the input of analog signal to setting of the
16-bit data of both channels from the input register to the output register of the ADC. This time includes the
group delay of the HPF. For the DAC, this time is from setting the 16-bit data of both channels from the input
register to the output of analog signal. Group delay of DAC part is 25/fs(typ.) at PMADL=PMADR bits = “0”.
Note 45. When PMADL bit = “1” or PMADR bit = “1”, the HPF of ADC is enabled but the HPF of DAC is disabled.
When PMADL=PMADR bits = “0”, PMDAC bit = “1”, the HPF of DAC is enabled but the HPF of ADC is
disabled.
MS0625-E-01
- 20 -
2007/06