UNIT-9

A DAC is a

• digital-to-analog computer
• digital analysis calculator
• data accumulation converter
• digital-to-analog converter

A type of Error associated with digital to analog converters (DACs) is:

• nonmonotonic error
• incorrect output codes
• offset error
• nonmonotic and offset error

In troubleshooting a DAC, we check its performance characteristics, such as______________

• nonmonotonicity
• differential nonlinearity
• low and high gain
• all of the above

What is gain error in a DAC

• missing codes
• error in the slope of the output staircase waveform
• more or less input voltage is required for the first step than what is specified
• None

A Binary weighted digital to analog converter has an input resistor of 100kΩ. What will be current through the resistor, if the resistor is connected to a 5V Source?

• 50μA
• 5mA
• 500μA
• 50mA

In a binary weighted DAC, the lowest-value resistor corresponds to

• the highest binary weighted input
• the lowest binary weighted input
• the first input
• the last input

As Compared to binary weighted digital to analog DAC converter , the major advantage of the R/2R ladder digital to analog (DAC) is

• It only uses two different resistor values
• it has a fewer part of the same number of inputs
• Its Operation is much easier to analyse
• The Virtual Ground is elimated and the circuit is therefore easier to understand and troubleshoot

Which term applies to the maintaining of a given signal level until the next sampling

• Holding
• Aliasing
• shannon frequency sampling
• stair-stepping

In analog to digital converter (ADCs) sample - and - hold circuits are designed to

• Sample and hold the output of the binary counter during the conversion process
• stabilize the comparator threshold voltage during the comparison process
• stabilize the input analog signal during the conversion process
• sample and hold the D/A converter staircase waveform during the conversion process

What is the Purpose of Sample and Hold Circuit?

• To keep temporary memory
• Tp hold a voltage constant so an ADC has time to produce an output
• To hold a voltage constant so a DAC has time to produce an output
• To hold data after multiplexer has selected an output