AK4691 Datasheet, PDF (13/80 Pages) Asahi Kasei Microsystems – 4ch ADC + 2ch DAC with MIC/HP/SPK-AMP

[AK4691]
FILTER CHARACTERISTICS
(Ta=25°C; AVDD=DVDD=SVDD=2.6 ∼ 3.6V; LVDD=MVDD= 2.6 ∼ 5.5V; TVDD1=TVDD2=1.6 ∼ 3.6V; fs=48kHz;
DEM=OFF; FIL1=FIL3=EQ=OFF)
Parameter
Symbol
min
typ
max
Units
ADC Digital Filter (Decimation LPF):
Passband (Note 34)
±0.16dB
PB
0
-
18.8
kHz
−0.66dB
−1.1dB
−6.9dB
-
21.1
-
kHz
-
21.6
-
kHz
-
24.0
-
kHz
Stopband
SB
28.4
-
-
kHz
Passband Ripple
PR
-
-
±0.1
dB
Stopband Attenuation
SA
73
-
-
dB
Group Delay (Note 35)
GD
-
19
-
1/fs
Group Delay Distortion
ΔGD
-
0
-
μs
ADC Digital Filter (HPF): (Note 36)
Frequency Response (Note 34) −3.0dB
FR
-
1.0
-
Hz
−0.5dB
-
2.9
-
Hz
−0.1dB
-
6.5
-
Hz
DAC Digital Filter (LPF):
Passband (Note 34)
±0.1dB
PB
0
-
21.3
kHz
−0.7dB
−6.0dB
-
21.8
-
kHz
-
24.0
-
kHz
Stopband
SB
25.2
-
-
kHz
Passband Ripple
PR
-
-
±0.01
dB
Stopband Attenuation
SA
59
-
-
dB
Group Delay (Note 35)
GD
-
26
-
1/fs
DAC Digital Filter (LPF) + SCF:
Frequency Response: 0 ∼ 20.0kHz
FR
-
±1.0
-
dB
DAC Digital Filter (HPF): (Note 36)
Frequency Response (Note 34) −3.0dB
FR
-
1.0
-
Hz
−0.5dB
-
2.9
-
Hz
−0.1dB
-
6.5
-
Hz
BOOST Filter: (Note 37)
Frequency Response MIN 20Hz
FR
-
6.27
-
dB
100Hz
-
3.18
-
dB
1kHz
-
0.02
-
dB
MID 20Hz
FR
-
11.6
-
dB
100Hz
-
7.44
-
dB
1kHz
-
0.14
-
dB
MAX 20Hz
FR
-
17.48
-
dB
100Hz
-
11.47
-
dB
1kHz
-
0.40
-
dB
Note 34. The passband and stopband frequencies scale with fs (system sampling rate).
For example, ADC is PB=0.45 x fs (@-1.1dB). Each response refers to that of 1kHz.
Note 35. 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.
DAC group delay is at PMADC1 = PMADC2 bits = “0”. When PMADC1 bit is “1” or PMADC2 bit is “1”, it is
typ. 19/fs.
Note 36. When PMADC1 bit = “1” or PMADC2 bit = “1”, the HPF of ADC is enabled but the HPF of DAC is disabled.
When PMADC1 = PMADC2 bits = “0” and PMDAC bit = “1”, the HPF of DAC is enabled (@ HPFN bit = “0”)
but the HPF of ADC is disabled.
Note 37. These frequency responses scale with fs. If a high-level and low frequency signal is input, the analog output clips
to the full-scale.
MS0672-E-00
- 13 -
2007/11