## 24/03/2020

### Analog To Digital & Digital To Analog Interview Question - 1

What is meant by digital quantity?

Digital Quantity

It is quantity that has only discrete values. It is expressed in the digital form.

What is meant by analog quantity?

Analog Quantity

It is quantity which can take any value over a continuous range of values. E.g. temperatures, pressure, position, speed etc.

Write the full form of DAC and ADC.

DAC : Digital to analog converter

ADC : Analog to digital converter

Describe the function of A/D converter and D/A converter

Function of A / D converter

The function of the A / D converter is to convert analog quantity into digital quantity.

Function of D / A converter

The function of the D / A converter is to convert digital code to a value.

How the analog to digital conversion is done?

Analog to digital conversion

Any physical quantity is first monitor by computer and it is converted into electrical signal by transducer. This electrical signal is converter into digital signals by using analog to digital converters.

How many numbers of possible inputs does the 4 – bit DAC consists of?

16 inputs

Explain the statement ‘The output of the DAC is pseudo analog quantity.’

The output of the DAC is not true analog quantity because it can take specific values. It is actually digital therefore the output of the DAC is pseudo analog quantity.

What is full scale output of the 3 – bit DAC?

Full scale output of the DAC

The maximum output of the DAC is called as full-scale output. The maximum output of the 4 bit input is 15V.

Explain the term: Resolution, Linearity error and Full scale error

Resolution

It is defined as smallest change that occurs in the analog output due to change in the digital input.

Linearity error

It is defined as the maximum deviation of the analog output from the ideal output.

Full scale error

It is defined as the maximum deviation of the digital to analog converter output from its ideal value.

How the resolution of the DAC is expressed?

The resolution of the DAC is expressed as the amount of current or voltage per step.

How many numbers of step size for the N – bit DAC?

2N – 1

How the accuracy of the DAC is expressed?

The accuracy of the DAC is expressed in terms of linearity error and full scale error.

Define : Settling time, Offset voltage

Settling time

It is time delay between the binary data appears at the input and stable output is obtained at the output.

Offset voltage

There is small output voltage in spite of binary input is zero. It is called as offset voltage.

In which term the operating speed of the DAC is expressed?

The operating speed of the DAC is expressed by its settling time.

What do you mean by monotonicity of the DAC?

Monotonicity

If the output of the DAC is increases as the binary input is increased from one value to the next value, it is called as Monotonicity.

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