Analog to Digital convertor parameters

In Microcontroller we need to interface a sensor which gives analog output. So we need to use ADC of Microcontroller. before use ADC we have to learn some basic parameter of ADC. some parameter are given below.

1. ADC is 10 bit, 8 bit or other:- or n bit ADC here n decided the total number of quantization level.

                                 total no. of quantization level  = 2ⁿ level
Now if an ADC of 10 bit than n=10 than
                                      total no. of quantization level = 2¹⁰
                                                                                   = 1023
2. -Vref and +Vref voltage:- -ve and +ve reference voltage define the range of analog signal or analog voltage applied at analog pin of MCU.
If we take 0 volt as -Vref and 5 volt as +Vref
                                                             than the range is (5 - 0 = 5)volts

the range of this signal of range 5V

                       if 10 bit ADC then          no. of slice of 5V is 1023
                       if  8 bit ADC then           no. of  slice of  5V is 511
                       and same this with other