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AK5572EN Datasheet, PDF (10/68 Pages) Asahi Kasei Microsystems – 2-Channel Differential 32-bit ADC | |||
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[AK5572]
9. Filter Characteristics
â ADC Filter Characteristics (fs= 48 kHz)
(Ta= ï40 - +105 ï°C; AVDD= 4.75-5.25 V, TVDD=1.7-1.98 V (LDOE pin=âLâ) or 3.0-3.6 V (LDOE pin=âHâ),
VDD18= 1.7-1.98 V (LDOE pin= âLâ))
Parameter
Symbol Min.
Typ.
Max.
Unit
Digital Filter (Decimation LPF): SHARP ROLL-OFF (Figure 3)
(SD pin=âLâ, SLOW pin=âLâ)
Passband (Note 13) +0.001/ï0.06 dB
PB
ï6.0 dB
Stopband (Note 13)
SB
Stopband Attenuation
SA
0
-
22.0
kHz
-
24.4
-
kHz
27.9
-
-
kHz
85
-
-
dB
Group Delay Distortion 0 - 20.0 kHz
Group Delay (Note 14)
ïGD
-
0
-
1/fs
GD
-
19
-
1/fs
Digital Filter (Decimation LPF): SLOW ROLL-OFF (Figure 4)
(SD pin=âLâ, SLOW pin=âHâ)
Passband (Note 13) +0.001/ï0.076 dB
PB
ï6.0 dB
Stopband (Note 13)
SB
Stopband Attenuation
SA
0
-
12.5
kHz
-
21.9
-
kHz
36.5
-
-
kHz
85
-
-
dB
Group Delay Distortion 0 - 20.0 kHz
Group Delay (Note 14)
ïGD
-
0
-
1/fs
GD
-
7
-
1/fs
Digital Filter (Decimation LPF): SHORT DELAY SHARP ROLL-OFF FILTER (Figure 5)
(SD pin=âHâ, SLOW pin=âLâ)
Passband (Note 13) +0.001/ï0.06 dB
PB
ï6.0 dB
Stopband (Note 13)
SB
Stopband Attenuation
SA
0
-
22.0
kHz
-
24.4
-
kHz
27.9
-
-
kHz
85
-
-
dB
Group Delay Distortion 0 - 20.0 kHz
Group Delay (Note 14)
ïGD
-
GD
-
-
2.8
1/fs
5
-
1/fs
Digital Filter (Decimation LPF): SHORT DELAY SLOW ROLL-OFF (Figure 6)
(SD pin=âHâ, SLOW pin=âHâ)
Passband (Note 13) +0.001/ï0.076 dB
PB
ï6.0 dB
-
Stopband (Note 13)
SB
0
-
12.5
kHz
-
21.9
-
kHz
36.5
-
-
kHz
Stopband Attenuation
SA
85
-
-
dB
Group Delay Distortion 0 - 20.0 kHz
Group Delay (Note 14)
ïGD
-
GD
-
-
1.2
1/fs
5
-
1/fs
Digital Filter (HPF):
Frequency Response
(Note 13)
ï3.0 dB
ï0.5 dB
ï0.1 dB
-
1.0
-
Hz
FR
-
2.5
-
Hz
-
6.5
-
Hz
Note 13. The passband and stopband frequencies scale with fs.
For example, PB (+0.001 dB/ï0.06 dB) =0.46 ï´ fs (SHARP ROLL-OFF).
For example, PB (+0.001 dB/ï0.076 dB) =0.26 ï´ fs (SLOW ROLL-OFF).
Note 14. The calculated delay time induced by digital filtering. This time is from the input of an analog
signal to the L channel MSB output timing of the SDTO. It may have an error of +1[1/fs] at
maximum when outputting data via audio interfaces.
015016766-E-00
- 10 -
2015/12
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