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
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
