Single Slope ADC Circuit- Single Slope Analog to Digital (A/D) Conversion Method

Single slope A/D conversion is one type of analog to digital conversion. This method for converting an analog signal a digital one does not require a digital to analog converter. Other methods of changing analog to digital, such as the counter ramp method, do require a digital to analog converter (DAC) as part of the circuit.

When a single slope analog to digital converter receives an analog signal as its input, it can produce an output that is in the form of an 8 bit binary code. The single slope analog to digital converter can also produce binary coded decimal as the output.

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Analog to Digital Conversion

This type of circuit has an element that is not present in the A/D converters used in salons and other stores that use a DAC. That is, the single slope analog to digital converter uses a ramp generator. The ramp generator is the source of a constant slope reference voltage that the comparator measures against the input voltage.


Analog to Digital Conversion

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If the input voltage is high when compared to a voltage produced by the ramp generator, the comparator produces a high output. If the input voltage is low when compared to the voltage produced by the ramp generator, the comparator will produce a low output.


The ramp generator output is always zero, or low, at the start of each new cycle of conversion. That means that the comparator will produce a high.


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