How accurate is the ADC on PIC18?

Status
Not open for further replies.
C

chris414

New Member
How much accuracy can I expect with a PIC18F2550? I'm using the example code from microchip for some simple ADC and compared with my multimeter (it's a good multimeter, not a cheap supermarket special) it's reading about 0.2V higher than the actual reading (the error is less at lower voltages). Is this normal?
 
Last edited:

How good is your reference voltage? Did you choose Vdd as the reference for the ADC or are you using a precise external reference?
What is the source feeding the ADC?
 
Assuming you used a voltage divider, the divider resistors' accuracy makes an enormous difference. As much as +5% on one and -5% on the other (worst case) is a lot of error!

The PIC18F's ADC is just as accurate as the spec sheet (and errata sheet) says.
 
Last edited:

if you had it set up right you should be within 0.01volts of actual
 
Status
Not open for further replies.

Similar threads

P
How does the parametric search work on the Microchip website?
Replies
7
Views
1K
Nigel Goodwin
Nigel Goodwin
S
  • Question
Choosing the Right Protection for Digital and ADC Inputs
Replies
5
Views
6K
danadak
danadak
Y
  • Question
Regarding the Proteus8 software simulation problem, how to generally solve this problem?
Replies
2
Views
891
Tony Stewart
Tony Stewart
M
  • Question
Trigger power to my Dashcam ignition wire based on vehicle Ignition from CAN high Pin on the j1939 port.
Replies
4
Views
3K
rjenkinsgb
rjenkinsgb
P
How do I get 64MHz on 18F25k22
Replies
10
Views
6K
Pommie
P