AK4121A AKM [Asahi Kasei Microsystems], AK4121A Datasheet - Page 15

• Manufacturer Part Number: AK4121A
• Description: Asynchronous Sample Rate Converter
• Manufacturer: AKM [Asahi Kasei Microsystems]

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Figure 12 shows the jitter tolerance to ILRCK. The jitter quantity is defined by the jitter frequency and the jitter
amplitude shown in Figure 12. When the jitter amplitude is 0.01UIpp or less, the AK4121A operates normally
regardless of the jitter frequency.
Note 14. The jitter amplitude for 1UI (Unit Interval) is one cycle of ILRCK. When FSI = 48kHz, 1UI is 1/48kHz =
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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. In case of the AK4121, the output
data becomes incorrect when the speed of the frequency change exceeds 0.14%/sec. The AK4121A operates normally
up to 23%/sec speed and the output data becomes incorrect at the speed of the frequency change over 23%/sec.
MS0337-E-02
Jitter Tolerance
Tracking to the Input Sampling Frequency
(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.
20.8μs.
10.00
1.00
0.10
0.01
0.00
1
(2)
10
AK4121A Jitter Tolerance
Figure 12. Jitter Tolerance
Jitter Frequency [Hz]
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(1)
100
(3)
1000
10000
2007/07