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| 型號(hào)： | SAF-TC1910-LEBBA |
| 廠(chǎng)商： | INFINEON TECHNOLOGIES AG |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 66 MHz, RISC MICROCONTROLLER, PBGA208 |
| 封裝： | PLASTIC, LBGA-208 |
| 文件頁(yè)數(shù)： | 43/68頁(yè) |
| 文件大?。?/td> | 2700K |
| 代理商： | SAF-TC1910-LEBBA |
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TC1910
Data Sheet
44
V 1.0, 2003-10
PRELIMINARY
Figure 14
Approximated Maximum Accumulated PLL Jitter
The following two formulas define the (absolute) approximate maximum value of jitter
DN
in [ns] dependent on the K-factor, the system clock frequency
fSYS in [MHz], and the
number
P of consecutive fSYS periods.
[1]
[2]
With rising number
P of clock cycles the maximum jitter increases linearly up to a specific
value of
P. Beyond this value of P the maximum accumulated jitter remains at a constant
value.
TC191x_pll_jitter
0
±0.0
P
ns
D
N
±1.0
±2.0
±3.0
±5.0
510
15
20
25
30
±4.0
35
D
N
P
K
= Max. jitter
= Number of consecutive f
SYS
periods
= K-divider of PLL
f
SYS =
60 MHz (K = 5)
f
SYS
= 50 MHz (K = 6)
f
SYS
= 40 MHz (K = 7)
f
SYS =
33 MHz (K = 8)
f
SYS =
66 MHz (K = 4)
for
P < 0.25
× f
SYS
DN [ns] = ± [(
735
fSYS × K
+ 0.9)
×
P
fSYS × 0.25
+ 0.5 ]
for
P >
DN [ns] = ± [
0.25
× f
SYS
735
fSYS × K
+ 1.4 ]
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