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參數(shù)資料
| 型號： | TMS320C242PGS |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | 16-Bit Digital Signal Processor |
| 中文描述： | 16位數(shù)字信號處理器 |
| 文件頁數(shù)： | 47/66頁 |
| 文件大?。?/td> | 803K |
| 代理商： | TMS320C242PGS |
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TMS320C242
DSP CONTROLLER
SPRS063B – DECEMBER 1997 – REVISED DECEMBER 1999
47
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
CLOCK CHARACTERISTICS AND TIMINGS
clock options
PARAMETER
PLL multiply-by-4
The ’C242 device includes an on-chip PLL which is hardwired for multiply-by-4 operation. This requires the use
of a 5-MHz clock input frequency for 20-MHz device operation. This input clock can be provided from either
an external reference crystal or oscillator.
external reference crystal clock option
The internal oscillator is enabled by connecting a crystal across XTAL1/CLKIN and XTAL2 pins as shown in
Figure 17a. The crystal should be in fundamental operation and parallel resonant, with an effective series
resistance of 30
(typical)
and a power dissipation of 1 mW; it should be specified at a load capacitance of
20 pF.
external reference oscillator clock option
The internal oscillator is disabled by connecting a TTL-level clock signal to XTAL1/CLKIN and leaving the XTAL2
input pin unconnected as shown in Figure 17b.
External
Clock Signal
(toggling 0–5 V)
C2
(see Note A)
C1
(see Note A)
Crystal
XTAL2
XTAL1/CLKIN
XTAL1/CLKIN
XTAL2
NC
(a)
(b)
NOTES: A. For the values of C1 and C2, see the crystal manufacturer’s specification.
B. TI recommends that customers have the resonator/crystal vendor characterize the operation of their device with the DSP chip. The
resonator/crystal vendor has the equipment and expertise to tune the tank circuit. The vendor can also advise customers regarding
the proper component values which ensure startup and stability over the entire operating range.
Figure 17. Recommended Crystal/Clock Connection
If the input frequency is 5 MHz, the series resistances of the crystal can be between 30 to 150
.
A
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相關(guān)代理商/技術(shù)參數(shù) |
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| TMS320C25 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SECOND-GENERATION DIGITAL SIGNAL PROCESSORS |
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| TMS320C25FNA | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC Digital Signal Proc RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風格:SMD/SMT |
| TMS320C25FNA50 | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC DIGITAL SIGNAL PROCESSORS RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風格:SMD/SMT |
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