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参数资料
| 型号： | SPAK56F807VF80 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 数字信号处理 |
| 英文描述： | 16-BIT, 80 MHz, OTHER DSP, PBGA160 |
| 封装： | MOLD ARRAY PROCESS, BGA-160 |
| 文件页数： | 17/48页 |
| 文件大小： | 853K |
| 代理商： | SPAK56F807VF80 |
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24
DSP56F807 Preliminary Technical Data
MOTOROLA
3.5 External Clock Operation
The DSP56F807 system clock can be derived from an external crystal or an external system clock signal.
To generate a reference frequency using the internal oscillator, a reference crystal must be connected
between the EXTAL and XTAL pins.
3.5.1
Crystal Oscillator
The internal oscillator is also designed to interface with a parallel-resonant crystal resonator in the frequency
range specified for the external crystal in Table 29. In Figure 9 a typical crystal oscillator circuit is shown.
Follow the crystal supplier’s recommendations when selecting a crystal, since crystal parameters determine
the component values required to provide maximum stability and reliable start-up. The crystal and
associated components should be mounted as close as possible to the EXTAL and XTAL pins to minimize
output distortion and start-up stabilization time.
Figure 9. Connecting to a Crystal Oscillator
3.5.2
Ceramic Resonator
It is also possible to drive the internal oscillator with a ceramic resonator, assuming the overall system
design can tolerate the reduced signal integrity. In Figure 10, a typical ceramic resonator circuit is shown.
Refer to supplier’s recommendations when selecting a ceramic resonator and associated components. The
resonator and components should be mounted as close as possible to the EXTAL and XTAL pins.
Figure 10. Connecting a Ceramic Resonator
3.5.3
External Clock Source
The recommended method of connecting an external clock is given in Figure 11. The external clock
source is connected to XTAL and the EXTAL pin is grounded.
Figure 11. Connecting an External Clock Signal
Sample External Crystal
Parameters:
Rz = 10 M
fc = 4-8 MHz (optimized for 8 MHz)
EXTAL XTAL
Rz
fc
Sample Ceramic
ResonatorParameters:
Rz = 10 M
fc = 4-8 MHz (optimized for 8 MHz)
EXTAL XTAL
Rz
fc
DSP56F807
XTAL
EXTAL
External
VSS
Clock
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