Hi amit,
Bit Rate Resolution:
Ok let separate these words like Bit Rate (BR) Resolution just to understand. Bit Rate is defining the rate of bits, Binary Digits 0, 1, 0, 1 (per unit time i,e; Second). Now if we divide the 1 second into 10 and then we divide it into 20, in first case we will have 10 happenings in one second and in second case the happenings will be 20 times in one second, means we can put more information in 20 times happening for the same times as compared to 10 times. This is known as RESOLUTION. In first case 10 and in second 20 (again remember this all refers to UNIT TIME). This will also increase the speed of work as the word length is increasing. It means more is the resolution more precise is the information. Let me put it little more elaborating :
Assume we have a picture and we call it a FRAME, now how many PIXELS are making this picture will be known as RESOLUTION and how many frames per unit time is the SAMPLING RATE. I think I can not text up more elaboration than this.
If I am working I would have preferred the Delta Sigma ADCs.
If any further question please ask without hesitation.
Good Luck.