AK4555 Datasheet, PDF (6/17 Pages) Asahi Kasei Microsystems – Low Power & Small Package 20bit ΔΣ CODEC

ASAHI KASEI
[AK4555]
FILTER CHARACTERISTICS
(Ta=25°C; VDD=1.6 ∼ 3.6V; fs=44.1kHz; DEM1 pin = “L”, DEM0 pin = “H”)
Parameter
Symbol
min
typ
ADC Digital Filter (Decimation LPF):
Passband
(Note 6) ±0.1dB
PB
0
-
−1.0dB
-
20.0
−3.0dB
-
21.1
Stopband
SB
25.7
-
Passband Ripple
PR
-
-
Stopband Attenuation
SA
65
-
Group Delay
(Note 7)
GD
-
17.0
Group Delay Distortion
∆GD
-
0
ADC Digital Filter (HPF):
Frequency Response (Note 6) −3dB
FR
-
3.4
−0.5dB
-
10
−0.1dB
-
22
DAC Digital Filter:
Passband
(Note 6) ±0.05dB
PB
0
-
−6.0dB
-
22.05
Stopband
SB
24.1
-
Passband Ripple
PR
-
-
Stopband Attenuation
SA
54
-
Group Delay
(Note 7)
GD
-
19.0
DAC Digital Filter + Analog Filter:
Frequency Response
0 ∼ 20.0kHz
FR
-
±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 20 bit 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 20 bit data of both channels on input register to the
output of analog signal.
DC CHARACTERISTICS
(Ta=25°C; VDD=1.6 ∼ 3.6V)
Parameter
Symbol
min
typ
max
Units
High-Level Input Voltage 2.2V≤VDD≤3.6V
VIH
70%VDD
-
-
V
1.6V≤VDD<2.2V
VIH
80%VDD
-
-
V
Low-Level Input Voltage 2.2V≤VDD≤3.6V
VIL
-
-
30%VDD
V
1.6V≤VDD<2.2V
VIL
-
-
20%VDD
V
High-Level Output Voltage (Iout= −20µA)
VOH VDD−0.1
-
-
V
Low-Level Output Voltage (Iout= 20µA)
VOL
-
-
0.1
V
Input Leakage Current
Iin
-
-
±10
µA
MS0363-E-01
-6-
2005/08