AK7738VQ Datasheet, PDF (28/42 Pages) Asahi Kasei Microsystems – Multi DSP with 5ch ADC + 4ch DAC + 8ch SRC

[AK7738]
2-4 Short Delay Slow Roll-Off Filter (DASD bit = “1”, DASL bit = “1”)
fs=48kHz
Parameter
Symbol
min
typ
max
Unit
SHORT DELAY SLOW ROLL-OFF
Passband (Note 31)
-0.07dB~+0.05dB
-3.0dB
PB
PB
0
10.1
kHz
20.24
kHz
Passband Ripple
PR
-0.07
+0.05
dB
Stopband
(Note 31)
SB
43.0
kHz
Stopband Attenuation (Note 33)
SA
74.9
dB
Group Delay
(Note 32)
GD
5.2
1/fs
Digital Filter + SCF
Frequency Response : 0Hz  20kHz
FR
-3.50
-2.50
dB
fs=96kHz
Parameter
Symbol
min
typ
max
Unit
SHORT DELAY SLOW ROLL-OFF
Passband (Note 31)
-0.07dB~+0.05dB
-3.0dB
PB
PB
0
20.3
kHz
40.50
kHz
Passband Ripple
PR
-0.07
+0.05
dB
Stopband
(Note 31)
SB
86.0
kHz
Stopband Attenuation (Note 33)
SA
74.9
dB
Group Delay
(Note 32)
GD
5.2
1/fs
Digital Filter + SCF
Frequency Response : 0Hz  40kHz
FR
-4.00
-2.50
dB
fs=192kHz
Parameter
Symbol
min
typ
max
Unit
SHORT DELAY SHARP ROLL-OFF
Passband (Note 31)
-0.07dB~+0.05dB
-3.0dB
PB
PB
0
40.6
kHz
81.00
kHz
Passband Ripple
PR
-0.07
+0.05
dB
Stopband
(Note 31)
SB
172.0
kHz
Stopband Attenuation (Note 33)
SA
74.9
dB
Group Delay
(Note 32)
GD
5.2
1/fs
Digital Filter + SCF
Frequency Response : 0Hz  80kHz
FR
-4.75
-2.75
dB
Note 31. The passband and stopband frequencies are proportional to fs (sampling rate).
Note 32. Delay time caused by the digital filter calculation. This time is measured from setting of the
16/24/32-bit impulse data to the input registers to output of the analog peak signal.
Note 33. Band width of Stopband Attenuation ranges from SB to fs.
015000122-E-00-PB
- 28 -
2015/01