AK4126 Datasheet, PDF (24/27 Pages) Asahi Kasei Microsystems – 6ch 192kHz / 24-Bit Asynchronous SRC

ASAHI KASEI
[AK4126]
Tracking to the Input Sampling Frequency
When the ILRCK is generated by an external PLL, it may take a time to settle after changing the input sampling frequency
because the response of an external PLL to the frequency change is slow. AK4126 operates normally up to 23%/sec speed
and the output data becomes incorrect at the speed of the frequency change over 23%/sec.
3. Digital Filter Response Example
Table 10 shows the examples of digital filter response performed by the AK4126.
Ratio
4.000
1.000
0.919
0.725
0.667
0.544
0.500
0.500
0.459
0.363
0.333
0.250
0.250
0.230
0.167
0.181
0.167
0.181
FSO/FSI [kHz]
192/48.0
48.0/48.0
44.1/48.0
32.0/44.1
32.0/48.0
48.0/88.2
48.0/96.0
44.1/88.2
44.1/96.0
32.0/88.2
32.0/96.0
48.0/192.0
44.1/176.4
44.1/192.0
32.0/192.0
32.0/176.4
8/48.0
8/44.1
Passband [kHz]
Stopband [kHz]
Stopband
Attenuation [dB]
22.000
26.000
−121.2
22.000
26.000
−121.2
20.000
24.100
−121.4
14.088
17.487
−115.3
13.688
17.488
−116.9
19.250
26.232
−114.6
20.900
27.000
−100.2
19.202
24.806
−100.2
18.700
25.000
−103.3
12.863
18.665
−102.0
12.500
18.900
−103.6
17.600
30.200
−104.0
16.170
27.746
−104.0
15.860
28.240
−103.3
11.200
19.600
−73.2
10.278
17.987
−73.2
2.800
4.900
−73.2
2.5695
4.4968
−73.2
Table 10. Digital Filter Example
Gain [dB]
−0.01@ 20k
−0.01@ 20k
−0.01@ 20k
−0.01@ 14.5k
−0.19@ 14.5k
−0.03@ 20k
−0.01@ 20k
−0.08@ 20k
−0.23@ 20k
−0.75@ 14.5k
−1.07@ 14.5k
−0.18@ 20k
−1.34@ 20k
−1.40@ 20k
−2.97@ 14.5k
−7.88@ 14.5k
−2.97@ 3.625k
−7.88@ 3.625k
MS0544-E-00
- 24 -
2006/09