This set of MSP430 Microcontroller Questions and Answers for Entrance exams focuses on “Successive Approximation ADC”.

1. The successive approximation converters have a resolution of _________
a) 8-10 bits
b) 10-12 bits
c) 12-16 bits
d) 16-32 bits

Explanation: The successive approximation converters have a resolution of about 10-12 bits in it.

2. In SAR based conversions, each bit typically requires one clock cycle (sometimes two) to make a comparison and set up the new voltage.
a) true
b) false
c) cant be said
d) depends on the conditions

Explanation: In SAR based conversions, each bit typically requires one clock cycle (sometimes two) to make a comparison and set up the new voltage.

3. The main operations that are basically performed in a SAR ADC are?
a) logic to control the operation
b) some way of generating the voltages, for comparison
c) logic to control the operation and finding some way of generating the voltages for comparison
d) none of the mentioned

Explanation: The main operations that are basically performed in a SAR ADC are the logic to control the operation and finding some way of generating the voltages, for comparison.

4. Usually, a capacitor is inserted between an analog input and the ground because
a) it blocks the analog voltage
b) it suppresses the noise
c) it increases the gain
d) none of the mentioned

Explanation: A capacitor is inserted between the analog input and the ground because it suppresses the noise.

a) The converters
b) SAR modules available in the MSP430
c) Sigma delta modules available in the MSP430
d) Comparator modules available in the MSP430

Explanation: ADC10 and ADC12 are the SAR modules available in the MSP430.
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6. ADC10 needs external capacitors on its voltage reference.
a) true
b) false
c) cant be said
d) depends on the conditions

Explanation: ADC12 needs external capacitors on its voltage reference as compared to the ADC10 module.

a) for controlling SAR module
b) for controlling the sigma delta module
c) for controlling the comparator module
d) all of the mentioned

Explanation: ADC10CTL0 and ADC10CTL1 are the registers that are used for controlling the SAR module in the MSP430.

8. While conversion is in progress, which of the flag is affected.

Explanation: While conversion is in progress, then ADC10BUSY flag is set.

a) 4
b) 8
c) 16
d) all of the mentioned

10. The input to the ADC10 is selected from_______bits of the ADC10CTL1 register?
a) INCHx
d) ENC

Explanation: The input to the ADC10 is selected from the INCHx bits of the ADC10CTL1 register.

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