Jump to content
Sign in to follow this  

10 bit ADC instead of 12 bit for more accuracy on F28027

Recommended Posts

I am using ADCINA7 (pin J5.3) to measure the voltage from a pressure sensor (after being amplified by an INA333). I have attached 3 pictures.


Picture #1: Y axis = voltage (mV), X axis = sample #.

Picture #2: Exponential fit of curve from Picture #1 (in excel)

Picture #3: Voltage (mV) after the exponential curve is subtracted 


I am noticing unexpected spikes that are most noticeable in Picture 3.


I wish that I had the option of increasing the gain of the INA333, but that is not possible with my application.


A former TI employee that I spoke with suggested that I use a 10 bit ADC instead of 12 bit ADC to prevent these spikes from occurring. At the time, this seemed like a great idea but, upon looking into it, I became uncertain if this is a possibility. Also, I am uncertain how to actually change the code so that it only uses a 10 bit ADC.


I would appreciate suggestions either to convert the 12 bit ADC to 10 bits or other ideas of how I might remove these spikes. 


Thanks for the info!




Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this