ASAHI KASEI
[AK4554]
FILTER CHARACTERISTICS
(Ta=25°C; VDD=1.6
∼
3.6V; fs=44.1kHz; DEM1 pin = “L”, DEM0 pin = “H”)
Parameter
Symbol
min
ADC Digital Filter (Decimation LPF):
Passband
(Note 6)
PB
0
±0.1dB
-
−1.0dB
-
−3.0dB
Stopband
SB
25.7
Passband Ripple
PR
-
Stopband Attenuation
SA
65
Group Delay
(Note 7)
GD
-
Group Delay Distortion
-
∆GD
ADC Digital Filter (HPF):
Frequency Response (Note 6)
FR
-
−3dB
-
−0.5dB
-
−0.1dB
DAC Digital Filter:
Passband
(Note 6)
PB
0
±0.05dB
-
−6.0dB
Stopband
SB
24.1
Passband Ripple
PR
-
Stopband Attenuation
SA
54
Group Delay
(Note 7)
GD
-
DAC Digital Filter + Analog Filter:
Frequency Response
FR
-
0
∼
20.0kHz
typ
-
20.0
21.1
-
-
-
17.0
0
3.4
10
22
-
22.05
-
-
-
19.0
±0.5
max
17.4
-
-
-
±0.1
-
-
-
-
-
-
20.0
-
-
±0.02
-
-
-
Units
kHz
kHz
kHz
kHz
dB
dB
1/fs
µs
Hz
Hz
Hz
kHz
kHz
kHz
dB
dB
1/fs
dB
Note 6. The passband and stopband frequencies scale with fs (sampling frequency). For examples, PB=20.0kHz(@ADC:
−1.0dB,
DAC:
−0.1dB)
are 0.454 x fs.
Note 7. This is the calculated delay time caused by digital filtering. This time is measured from the input of analog signal
to setting the 16bit data of both channels on input register to the output register of ADC. This time also includes
group delay of HPF. For DAC, this time is from setting the 16bit data of both channels on input register to the
output of analog signal.
DC CHARACTERISTICS
(Ta=25°C; VDD=1.6
∼
3.6V)
Parameter
High-Level Input Voltage
2.2V≤VDD≤3.6V
1.6V≤VDD<2.2V
Low-Level Input Voltage
2.2V≤VDD≤3.6V
1.6V≤VDD<2.2V
High-Level Output Voltage
(Iout=
−20µA)
Low-Level Output Voltage
(Iout= 20µA)
Input Leakage Current
Symbol
VIH
VIH
VIL
VIL
VOH
VOL
Iin
min
70%VDD
80%VDD
-
-
VDD−0.1
-
-
typ
-
-
-
-
-
-
-
max
-
-
30%VDD
20%VDD
-
0.1
±10
Units
V
V
V
V
V
V
µA
MS0325-E-01
-6-
2005/08
AKM [ ASAHI KASEI MICROSYSTEMS ]
