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PCIMX258CJM4A bảng dữ liệu(PDF) 112 Page - Freescale Semiconductor, Inc

tên linh kiện PCIMX258CJM4A
Giải thích chi tiết về linh kiện  i.MX25 Applications Processor for Consumer and Industrial Products
PDF  144 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

PCIMX258CJM4A bảng dữ liệu(HTML) 112 Page - Freescale Semiconductor, Inc

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i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 3
112
Freescale Semiconductor
Figure 82. Start-up Sequence
The output data can be read from adcout11...adcout0, and is available tdata nanoseconds after the rising
edge of eoc. The reset signal and the digital signals controlling the analog switches (ypsw, xpsw, ynsw,
xnsw) are totally asynchronous.
The following conditions are necessary to guarantee the correct operation of the ADC:
•
The input multiplexer selection (selin11…selin0) is stable during both the last clock cycle (14th)
and the first clock cycle (1st). The best way to guarantee this is to make the input multiplexer
selection during clock cycles 2 to 13.
•
The references are stable during clock cycle 1 to 13. The best way to guarantee this is to make the
reference multiplexer selection (selrefp and selrefn) before issuing an soc pulse and changing it
only after an eoc pulse has been acquired, during the last clock cycle (14).



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