參數(shù)資料
型號(hào): AK4127VF
廠商: Asahi Kasei Microsystems Co.,Ltd
英文描述: 192kHz / 24Bit High Performance Asynchronous SRC
中文描述: 192kHz的/ 24位高性能異步鋼骨混凝土
文件頁數(shù): 25/29頁
文件大小: 489K
代理商: AK4127VF
[AK4127]
2.
Jitter Tolerance
Figure 21shows the jitter tolerance to ILRCK and IBICK. The jitter quantity is defined by the jitter frequency and the jitter
amplitude shown in Figure 21. When the jitter amplitude is 0.01Uipp or less, the AK4127 operates normally regardless of
the jitter frequency.
AK4127 Jitter Tolerance
10.00
(1)
Normal operation
(2)
There is a possibility that the distortion degrades. (It may degrade up to about
50dB.)
(3)
There is a possibility that the output data is lost.
Note:
- When PLL2-0 = “L/*/*” (*: Don’t care), the jitter amplitude is for ILRCK and 1UI (Unit Interval) is one cycle of
ILRCK. When FSI = 48kHz, 1UI is 1/48kHz = 20.8
μ
s.
- When PLL2-0 = “H/*/*” (*: Don’t care), the jitter amplitude is for IBICK and 1UI (Unit Interval) is one cycle of
IBICK. When FSI = 48kHz, 1UI is 1/(64 x 48kHz) = 326ns.
Figure 21. Jitter Tolerance
Tracking to the Input Sampling Frequency
When the ILRCK is generated by an external PLL, it may take time to settle after changing the input sampling frequency
because the response of an external PLL to the frequency change is slow. The AK4127 operates normally up to 23%/sec
speed but outputs incorrect data at the speed of the frequency change over 23%/sec.
0.00
0.01
0.10
1.00
1
10
100
1000
10000
Jitter Frequency [Hz]
A
(3)
(2)
(1)
MS0593-E-01
2007/07
- 25 -
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