ADC Sampling time (LPC1317)

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by aamir ali on Sun Mar 24 23:58:52 MST 2013
In adc, there is conversion time & sampling time.
Conversion time is always fixed & sampling time may vary according to source impedance.  Right???????

Now I have to measure battery voltage 12V via LPC. So I am using simple resistor divider of 300K & 100k. So when voltage of 12v appears I get 3V at ADC pin.

Problem is in this case my source impedence, according to thevenin is

Rs = Rth = (100K || 300K)


But I didn't find anything related to sampling time in LPC datasheet.

How to solve this problem.

Also what's the conversion time.