http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb 2008 Rickey's World contact@nospam.com (Ajay Bhargav) contact@nospam.com (Ajay Bhargav) Thu, 08 Jan 2009 20:00:18 -0800 Thu, 08 Jan 2009 20:00:18 -0800 http://backend.userland.com/rss e107 (http://e107.org) 60 Search 8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes query http://www.8051projects.net/search.php http://www.8051projects.net/forum-t6731.html Actually for my applications, the ADC resolution required is atleast 12 bits. So i used the Oversampling method suggested by atmel application notes to enhance resolution upto 16 bits. It works well and readings are quite stable. But the problem occurs when i reduce the analog input to less than 10% of the full scale. here the linearity drastically differs. I have also removed all digital outputs from portC to eliminate cross interference of digital noise but the problem persists. suggest any solution if possible.]]> Sat, 08 Mar 2008 11:21:35 -0800 http://www.8051projects.net/forum-t6731.html http://www.8051projects.net/forum-t6731.html
try it in normal mode with 12bit resolution and see the response. if its still the same then must be some problem with interfering signal or something.

can i see your circuit?]]> contact@nospam.com (Ajay Bhargav) Sun, 09 Mar 2008 11:31:11 -0700 http://www.8051projects.net/forum-t6731.html http://www.8051projects.net/forum-t6731.html the application note no is AVR121 on atmel application notes.]]> contact@nospam.com (Ajay Bhargav) Tue, 11 Mar 2008 13:04:32 -0700 http://www.8051projects.net/forum-t6731.html http://www.8051projects.net/forum-t6731.html javascript:addtext(':mad',true)]]> contact@nospam.com (Ajay Bhargav) Tue, 11 Mar 2008 13:05:21 -0700 http://www.8051projects.net/forum-t6731.html http://www.8051projects.net/forum-t6731.html try sending the ADC o/p of 16-bit to UART (high 8-bit and low 8-bit).. and see if there is any change in that..

Also make this change in hardware.. connect a 100nF cap close to VCC pin of controller. can i see your circuit?]]> contact@nospam.com (Ajay Bhargav) Wed, 12 Mar 2008 10:57:04 -0700 http://www.8051projects.net/forum-t6731.html