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Make a Delta-Sigma Converter Using a …
1998 Microchip Technology 1 M AN700 INTRODUCTION This application note describes how to implement anAnalog-to-Digital (A/D) Converter function Using amember of the PIC16C6XX series of these microcontrollers do not have a built-inA/D Converter like other controllers from Microchip, thecomparator function, internal voltage reference and tim-ers can be used to digitize an analog signal. Some of the standard PICmicros have a comparatormodule, consisting of two comparators, both of whichcan be connected to PORTA in a variety of configura-tions. The internal voltage reference divider can beused with the comparators to establish , one of the comparator inputs can be con-figured to the RA2 port allowing for the use of an exter-nal voltage reference. By combining these elements, afirst order modulator and first order filter can bedesigned, emulating the function of an analog-to-digitaldelta-sigma method of conversion is quickly implemented infirmware with very few additional external , the cost of hardware implementation isminimal, particularly for such a high resolution con-verter solution.
1998 Microchip Technology Inc. DS00700A-page 1 M AN700 INTRODUCTION This application note describes how to implement an Analog-to …
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