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楼主 |
发表于 2009-9-24 21:22:45
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AD9834有2个频率控制寄存器和2个相位控制寄存器
9 FSELECT Frequency Select Input. FSELECT controls which frequency register, FREQ0 or FREQ1, is used in the phase
accumulator. The frequency register to be used can be selected using Pin FSELECT or Bit FSEL. When Bit FSEL is
used to select the frequency register, the FSELECT pin should be tied to CMOS high or low.
10 PSELECT Phase Select Input. PSELECT controls which phase register, PHASE0 or PHASE1, is added to the phase accumulator
output. The phase register to be used can be selected using Pin PSELECT or Bit PSEL. When the phase registers are being
controlled by Bit PSEL, the PSELECT pin should be tied to CMOS high or low.
9，10两个引脚就是来选择哪个寄存器输出有效的
(原文件名:未命名.jpg)
当控制寄存器的PIN/SW位置1时，频率/相位寄存器由外部引脚选择，当PIN/SW清0时，由FSEL/PSEL位选择 |
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发表于 2009-9-12 21:17:32
