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Why Analog and Digital power pins are connected together in TMS320F2808 controlCARD?

Other Parts Discussed in Thread: TMS320F2808, TMDSCNCD2808

I wanna have one query but unable to get answer.

I am using TMS320F2808 controlCARD with JTAG emulator. The problem is that the ADC channels arenot scanning the voltage signals accurately. I found out in controlCARD schematic that both Digital and Analog supplys are common and connected, however in datasheet it is recommended to have proper isolation. Why TI do this in TMS320F2808 controlCARD.

Link to TMS320F2808 controlCARD : http://focus.ti.com/docs/toolsw/folders/print/tmdscncd2808.html

Please forward this to concern persons, if you have no choice.

Kamran

eekamran@gmail.com