MICROPROCESSOR AND MICROCONTROLLER

Detailed explanation-1: -Also called the parallel A/D converter, this circuit is the simplest to understand. It is formed of a series of comparators, each one comparing the input signal to a unique reference voltage. The comparator outputs connect to the inputs of a priority encoder circuit, which then produces a binary output.

Detailed explanation-2: -The comparator is a major block used in the flash ADC for analog to digital conversion. The use of comparators count is varied depends on the resolution of the flash ADC. Comparator count increases as 2n for an n-bit resolution flash ADC.

Detailed explanation-3: -Flash ADCs are fairly expensive devices when high digital resolution is required, since their complexity grows geometrically with the number of bits (2n – 1 comparators for n bits). So, even an 8-bit flash converter requires 255 comparators and a moderately complex digital decoder.

Detailed explanation-4: -Comparing Types of ADCs The dual slope, used mostly in measurement instruments such as a digital voltmeter, has a slow sampling rate. Successive-approximation ADCs have good resolution and moderately high sampling rate, while the flash converter offers the fastest sampling but typically has lower resolution.