PCIMX258CJM4A datasheet(112/144 Pages) FREESCALE

Part #	PCIMX258CJM4A

Description	i.MX25 Applications Processor for Consumer and Industrial Products

PDF	144 Pages

Scroll/Zoom	100%

Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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112 / 144 page

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).

PCIMX258CJM4A Datasheet(PDF) 112 Page - Freescale Semiconductor, Inc