Question

Calculate the resolution 8-bit of adc with reference voltage 12 v.

Answer 1

Answer:

In analog-to-digital converter (ADC) accepts an analog input-a voltage or a current-and converts it to a digital value that can be read by a microprocessor. Figure 1shows a simple voltage-input ADC. This hypothetical part has two inputs: a reference and the signal to be measured. It has one output, an 8-bit digital word that represents the input value.

EXPLANATION

The reference voltage is the maximum value that the ADC can convert. Our example 8-bit ADC can convert values from 0V to the reference voltage. This voltage range is divided into 256 values, or steps. The size of the step is given by:

Vref/256

where Vrefis the reference voltage. The step size of the converter defines the converter's resolution. For a 5V reference, the step size is:

5V/256 = 0.0195V or 19.5mV

Our 8-bit converter represents the analog input as a digital word. The most significant bit of this word indicates whether the input voltage is greater than half the reference (2.5V, with a 5V reference). Each succeeding bit represents half the range of the previous bit.

Answer 2

Concept:

Analog to Digital Converters transform an analog signal into a digital signal.

The Resolution (R) can be defined as:

R = V/(2ⁿ - 1)

Where n is the number of bits and V is the voltage.

Given:

The reference voltage is 12 V.

Find:

The resolution 8-bit of ADC (Analog to Digital Converter) for the reference voltage is 12 V.

Solution:

The resolution of the Analog to Digital Converter depends on the number of bits.

Calculating the Resolution (R):

R = V/(2ⁿ - 1) = 12 / (2⁸ - 1 )

R  = 12/ (256-1) = 12/255 = 0.047 V

Hence, the resolution 8-bit of analog to digital converter with a reference voltage of 12 V is 0.047 V.

#SPJ3