4 channel adc
Introduction 4 channel adc:
An analog-to-digital converter (ADC) was used to convert an analog signal such as voltage to digital form so that it could be read and processed by the microcontroller. Most of the microcontrollers have built-in ADC converters. It was also possible to connect an external ADC converter to any type of microcontroller. ADC converters are usually 10 and 12 bits, having 1024–4096 quantization levels.
The ADC conversion process must be started for the user program and it may take several hundreds of microseconds for conversion to complete. ADC converters usually generate interrupts when the conversion is complete so that the user program can read the converted data as quickly as possible. ADC converters were very useful to the control and monitoring applications since most sensors in real life (e.g., temperature sensor, pressure sensor, forces sensor,
Spceifications:
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programmable data rate:8 to 860 samples per second
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Weight unit : 11 g
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Colour unit : Light blue
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Additional colour : Black
Circuit Operation:
The Multichannel analog-to-digital converters (ADCs) typically convert each input channel sequentially using an input multiplexer. Certain applications require simultaneous conversions, especially when the phase information exists between different channels.
Step Size. The step size was the voltage difference between one digital level (i.e. 0001) and the next one (i.e. 0010 or 0000). For example, if an ADC has a step size of 1 Volt an input of 1 volt would produce an output, in a 4-bit converter, of 0001.
ADC has a resolution of one the part in 4,096, where 212 = 4,096. Thus, a 12-bit ADC with a maximum input of 10 VDC could resolve the measurement into 10 VDC/4096 = 0.00244 VDC = 2.44 mV. Similarly, for the same 0 to 10 VDC range, a 16-bit ADC resolution was 10/216 = 10/65,536 = 0.153 mV.
ADC was configured in differential mode and it was used to measure the AC voltage of the input signal. Configure the ADC peripheral following the steps as shown in the below figures. Open the configuration window from the ADC peripheral by clicking on ADC_0 as shown in fig below Fig 17 below.
An ADC takes a continuous analog signal or converts it to a discrete digital signal by taking samples that represent the signal's amplitude at specific points in time. The sample rate (or sampling rate) was the number of samples taken per second. The units from the sample rate are samples per second (sps) or Hertz (Hz).
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How the 4 channel adc Work:
The Multichannel analog-to-digital converters (ADCs) typically convert each input channel sequentially using an input multiplexer. Certain applications require simultaneous conversions, especially when phase information exists between the different channels.
An ADC works for sampling the value of the input at discrete intervals in the time. Provided that the input is sampled above the Nyquist rate, defined as twice the highest frequency for interest, then all frequencies in the signal could be reconstructed.
ADC has a resolution of the one part in 4,096, where 212 = 4,096. Thus, a 12-bit ADC for a maximum input of 10 VDC can resolve the measurement into the 10 VDC/4096 = 0.00244 VDC = 2.44( mV). Similarly, from the same 0 to 10 VDC range, a 16-bit ADC resolution is 10/216 = 10/65,536 = 0.153 mV.
Frequently Asked Questions
What is a channel in ADC?
Analog to Digital Converter - PortA. The ADC converted an analog input voltage to a 10-bit digital value. The ADC was connected to an 8-channel Analog Multiplexer which allowed each pin of PortA to be used as input from the ADC. The analog input channel was selected by the writing to the MUX bits in ADMUX.
How do ADC channels work?
Multichannel analog-to-digital converters (ADCs) typically convert each other input channel sequentially using input multiplexers. Certain applications require simultaneous conversions, especially when a phase for information exists between different channels.
What is 8-channel 10-bit ADC?
10-bit ADC means the data (digital value of analog input.. ) from it was a 10-bit number. Thus this ADC data can take 1024 unique values. 6 or 8-channel ADC in a microcontroller usually means: a 6 or 8 pins of microcontroller can be used to receive that many analog signals which can in turn be digitized
How do you control ADC?
ADC Window is the Comparator: Initialize the ADC, set the conversion window comparator low threshold, enable the conversion Window of mode, enable the Free-Running mode, start in the conversion, wait until the conversion is done, and read the ADC result in an infinite loop, and light up an LED if the ADC result was below the set ...
What is called a channel?
A channel is a passageway, a means of access to a thing, a communication, or an idea. Think of the channel as sort of a tunnel or a funnel that moves something directly through. The noun of the channel can be used for many such avenues.
