Contents
How do you convert ADC value?
ADC has a resolution of one part in 4,096, where 212 = 4,096. Thus, a 12-bit ADC with a maximum input of 10 VDC can resolve the measurement into 10 VDC/4096 = 0.00244 VDC = 2.44 mV. Similarly, for the same 0 to 10 VDC range, a 16-bit ADC resolution is 10/216 = 10/65,536 = 0.153 mV.
What is the maximum value that an ADC can output?
The maximum range for a 10-bit ADC is 1024 (2 to the power of 10). The actual numbers in the range are 0-1023, but the important part for this conversation is that there are 1024 discrete numbers. Much Better! For example let’s say that we attach a temperature sensor to an ADC pin on a 5V system that has a 10-bit ADC.
How do you convert analog signal to digital signal?
ADCs follow a sequence when converting analog signals to digital. They first sample the signal, then quantify it to determine the resolution of the signal, and finally set binary values and send it to the system to read the digital signal. Two important aspects of the ADC are its sampling rate and resolution.
How is the digital value of an ADC calculated?
20.2 Basic Operation An ADC samples an analog waveform at uniform time intervals and assigns a digital value to each sample. The digital value appears on the converter’s output in a binary coded format. The value is obtained by dividing the sampled analog input voltage by the reference voltage and them multiplying by the number of digital codes.
How does the ADC work in a DC converter?
Set the meter to read DC voltage and watch how the voltage and ADC value change as you twist the potentiometer knob. Remember the ADC is just converting the voltage into a number so as the voltage measured by the meter increases you’ll also see the ADC value increase!
How is the output code of an ADC read?
In most cases, the ADC code is read by a microcontroller in 8-bit segments and concatenated into a 32-bit data type. If the ADC’s resolution is less than 32 bits and the output code is signed, the data will need to be sign-extended into the 32-bit integer data type to preserve the sign. The code in Figure 3 shows an example of this operation.
How to read voltage in an analog to digital converter?
If you want to read very small changes in voltage you need a higher bit ADC, like 24 or even 32 bits of range, or a much smaller and more constrained reference voltage range. To demonstrate the analog to digital converter you can read the voltage output by a potentiometer.