AN2539 Freescale Semiconductor / Motorola, AN2539 Datasheet - Page 2

• Manufacturer Part Number: AN2539
• Description: Using the MC9328MX1/MC9328MXL Single Internal 32.768 kHz Crystal to Generate System Clock and USB
• Manufacturer: Freescale Semiconductor / Motorola

Measurement Results
3 Measurement Results
Table 2 and Table 3 show the jitter measurement results.
2
Sample 1
Sample 2
Sample 3
Sample 4
Sample 5
Sample 6
Sample 7
Sample 8
Sample 9
Sample 10
Sample 1
Sample 2
Sample 3
Sample 4
Sample 5
Sample 6
Sample 7
Sample 8
Sample 9
Sample 10
MC9328MXL
Sample
MC9328MX1
Sample
Table 2. 48 MHz USB Clock Cycle to Cycle Jitter (MC9328MX1)
Table 3. 48 MHz USB Clock Cycle to Cycle Jitter (MC9328MXL)
32.768 kHz Crystal Input to System PLL
51.248ps
57.679ps
61.789ps
90.048ps
111.07ps
54.392ps
94.043ps
87.243ps
126.37ps
63.332ps
32.768 kHz Crystal Input to System PLL
Mean
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MC9328MX1/MC9328MXL Application Note
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78.577ps
42.265ps
37.854ps
37.247ps
36.751ps
59.435ps
41.756ps
33.747ps
44.191ps
67.917ps
Mean
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Standard Deviation
77.737ps
80.717ps
75.384ps
86.314ps
75.725ps
61.543ps
78.685ps
92.748ps
92.516ps
86.31ps
Deviation
Standard
78.061ps
46.839ps
45.054ps
47.666ps
43.071ps
69.435ps
49.371ps
39.792ps
53.187ps
70.497ps
16 MHz Crystal Input to System PLL
16 MHz Crystal Input to System PLL
44.985ps
56.239ps
53.653ps
51.183ps
64.125ps
83.926ps
93.813ps
64.923ps
58.09ps
62.27ps
Mean
53.180ps
44.647ps
57.488ps
37.961ps
63.224ps
40.353ps
37.749ps
47.298ps
68.339ps
50.21ps
Mean
Deviation
Standard
62.388ps
77.656ps
84.976ps
70.263ps
78.693ps
70.409ps
91.549ps
77.376ps
92.584ps
90.343ps
Deviation
Standard
62.871ps
54.500ps
68.534ps
68.098ps
46.288ps
50.153ps
50.972ps
54.892ps
67.360ps
68.27ps
MOTOROLA