ADC Module

In ADC, give two factors that affect the step size calculation.

• Resolution & Vref

• Resolution & Vin

• Vin & Vref

• Vref & bit

True or False. A 10-bit ADC has 10-bit digital output.

• True

• False

Why do we need Analog to Digital Converter (ADC) in embedded system?

• Physical world deal with digital values while the embedded system give a value in analogue value.

• Embedded system use binary values (discrete) but physical world everything is analogue (continuous).

• No correct answer.

• Physical world cannot be analyse.

True or False. ADC is use to translate the analog signals to digital numbers so that the microcontroller can read and process them.

• True

• False

8-bit ADC have Vref=2.56V. Calculate the step size.

• 10mV

• 1mV

• 100mV

• 10uV

Calculate the D0-D7 output for 8-bit ADC, if Vref=1.28V and step size is 5mV.

• 10001100

• 10001101

• 10001110

• 10001111

What is the function of ADRESH and ADRESL register?

• Contain the result of the A/D conversion.

• Cleared the A/D interrupt flag.

• Set the conversion time.

• Used to select Vref and port configuration.

The following pin can be used as analog input, EXECPT

• RA0 pin

• RE0 pin

• RD3 pin

• RA1 pin

The following register used to configure ADC Module, EXCEPT

• ADCON0 register

• INTCON register

• ADCON2 register

• ADRESH & ADRESL register

The instruction ADCON0bits.GO=1 will make the program to ...............................

• A/D converter module is enable

• A/D idle

• A/D conversion in progress

• A/D converter is disable