Hi i am using anolog device aduc812 microcontroller i tryed to accesses buit in adc with out giving input i am getting output 0xFFF i.e maximum value in all channel except channel 8 ie temp sensor.taht gives some value ie 423 what is the problem please help me
If AVCC is low, all inputs will most probably also also show 0xfff.
But that's not what he sees. He has one channel reporting 0x4??. So he either has some AVCC connected, or his chip can work without it.