We are undertaking a project with the micro lpc3470 and we find it difficult to properly size the interface circuit for the analog readings by adchs.
We use the internal vref to 0.5V, in the datasheet is reported that the range of values are compared -400mV to + vref. But in the datasheet lpc3470 page. 131
Symbol Parameter Conditions Min Typ Max Unit
VDC DC input common mode level 0.1 0.5 0.9 V
-2048 0 +2047 digit
We (range) input voltage peak-to-peak 0.72 0.8 0.88 V
The minimum value in this case may range from 0.1 to 0.14V?
The maximum value in this case can range from 0.86 to 0.94V?
We can not correctly interpret these data.
Can you help?
Thanks and good job