參數(shù)資料
型號: TMX320VC5509AGHH
廠商: Texas Instruments, Inc.
元件分類: 數(shù)字信號處理
英文描述: TMS320VC5509A Fixed-Point Digital Signal Processor
中文描述: TMS320VC5509A定點數(shù)字信號處理器
文件頁數(shù): 88/144頁
文件大?。?/td> 1603K
代理商: TMX320VC5509AGHH
Electrical Specifications
88
November 2002 Revised January 2005
SPRS205D
5.6
Clock Options
The frequency of the reference clock provided at the X2/CLKIN pin can be divided by a factor of two or four
or multiplied by one of several values to generate the internal machine cycle.
5.6.1 Internal System Oscillator With External Crystal
The internal oscillator is always enabled following a device reset. The oscillator requires an external crystal
connected across the X1 and X2/CLKIN pins. If the internal oscillator is not used, an external clock source
must be applied to the X2/CLKIN pin and the X1 pin should be left unconnected. Since the internal oscillator
can be used as a clock source to the PLLs, the crystal oscillation frequency can be multiplied to generate the
CPU clock and USB clock, if desired.
The crystal should be in fundamental-mode operation, and parallel resonant, with a maximum effective series
resistance (ESR) specified in Table 51. The connection of the required circuit is shown in Figure 52. Under
some conditions, all the components shown are not required. The capacitors, C
1
and C
2
, should be chosen
such that the equation below is satisfied. C
L
in the equation is the load specified for the crystal that is also
specified in Table 51.
C
L
C
1
C
2
(
C
1
C
2
)
X2/CLKIN
X1
C1
C2
Crystal
R
S
Figure 52. Internal System Oscillator With External Crystal
Table 51. Recommended Crystal Parameters
FREQUENCY RANGE (MHz)
MAX ESR (
)
20
TYP C
LOAD
(pF)
10
MAX C
SHUNT
(pF)
7
R
S
(
)
0
2015
1512
30
16
7
0
1210
40
16
7
100
108
60
18
7
470
86
80
18
7
1.5k
65
80
18
7
2.2k
Although the recommended ESR presented in Table 51 is maximum, theoretically a crystal with a lower
maximum ESR might seem to meet the requirement. It is recommended that crystals which meet the
maximum ESR specification in Table 51 are used.
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