AK5351 Datasheet, PDF (7/19 Pages) Asahi Kasei Microsystems – Enhanced Dual bit 20bit ADC

ASAHI KASEI
[AK5351]
DIGITAL FILTER CHARACTERISTICS
(Ta=25°C; VA,VD,VB=5.0V±10%; fs=48kHz)
Low Pass Filter characteristics
Symbol
min
typ
max
Units
Passband
-0.005dB (Note 8 )
PB
0
21.5
kHz
-0.02dB
21.768
-0.06dB
22.0
Stopband
(Note 9 )
SB
26.5
kHz
Passband Ripple
(Note 10 )
PR
±0.005
dB
Stopband Attenuation (Note 9 ,Note 11 )
SR
80
dB
Group Delay Distortion
∆ GD
0
us
Group Delay
(Note 12 )
GD
29.3
1/fs
High Pass Filter characteristics
Frequency Response -3dB(Note 8 )
FR
1.0
Hz
-0.5dB
2.9
Hz
-0.1dB
6.5
Hz
Note 8 : These frequencies scale with the sampling frequency(fs).
Note 9 : Stopband is 26.5kHz to 3.0455MHz at fs=48kHz.
Note 10 : Passband is DC to 21.5kHz at fs=48kHz.
Note 11 : The analog modulator samples the input at 3.072MHz for a system sampling rate of
fs=48kHz. These is no rejection of input signals at those bandwidths which are multiples of
the sampling frequency (n x 3.072MHz ±22kHz ;n=0,1,2,3…).
Note 12 : The calculation delay time occurred by digital filtering. This is the time from the input of
analog signal to setting the 20bit data of both channels to the output registers. GD=29.3/fs.
ELECTRICAL CHARACTERISTICS
„ Digital Characteristics
(Ta=25°C; VA,VD,VB=5.0V±10%)
Parameter
Symbol
min
typ
max
Units
High-Level Input voltage
VIH
70%VD
-
-
V
Low-Level Input voltage
VIL
-
-
30%VD
V
High-Level Output voltage Iout=-20uA
VOH
VD-0.1
-
-
V
Low-Level Output voltage Iout=20uA
VOL
-
-
0.1
V
Input Leakage Current
(Note 13 )
Iin
-
-
±10
uA
Note 13 : Except for pull-down and pull-up pins. TST1, TST2, TST3, TST4, SMODE2 pins have internal
pull-down device, HPFE pin has internal pull-up devive(Typ. 50kΩ)
0166-E-00
-7-
1997/4