+ Post New Thread

Results 1 to 4 of 4

- 21st May 2007, 11:38 #1

- Join Date
- Sep 2006
- Posts
- 34
- Helped
- 0 / 0
- Points
- 1,303
- Level
- 8

## adc working

In the world, there are three catagories of ADC. I would like to ask what is the working principle of the successive approximate ADC. I get the block diagram but I don't understand the working principle...

thx:)

- 21st May 2007, 11:38

- 21st May 2007, 12:25 #2

- Join Date
- Feb 2007
- Location
- Belgrade, Serbia
- Posts
- 181
- Helped
- 18 / 18
- Points
- 2,305
- Level
- 11

## adc working principle

From this time diagram you can see basic idea. First you test MSB (100000), if it is less than Vin, then MSB=1 else MSB=0. Then you test MSB-1 (110000) from the pisture you can see that it is greater than Vin, so MSB-1=0 (100000). Than you test MSB-2 (101000) from picture it is equal, but you need to test rest of the bits. And so on, and so on.....

- 21st May 2007, 12:25

- 31st May 2007, 13:56 #3

- Join Date
- Oct 2005
- Location
- India
- Posts
- 1,804
- Helped
- 256 / 256
- Points
- 17,526
- Level
- 32

## successive approximation principle

the working principle is that you set the MSB as 1 and convert it to analog and compare it with the input and if the input is larger than this generated value then it is obvious that the MSB is 1 else it is 0... so you have found the MSB... now u keep the MSB as such and then find MSB-1 place and then so forth.....

- 31st May 2007, 13:56

- 1st June 2007, 08:02 #4

- Join Date
- Nov 2004
- Location
- Russia
- Posts
- 340
- Helped
- 69 / 69
- Points
- 3,806
- Level
- 14

## adc working

Look through AN 1080 from Maxim

"Understanding SAR ADCs"

http://pdfserv.maxim-ic.com/en/an/AN1080.pdf

+ Post New Thread

Please login