资料介绍
This application note describes how to implement an
Analog-to-Digital (A/D) Converter function using a
member of the PIC16C6XX series of microcontrollers.
Although these microcontrollers do not have a built-in
A/D Converter like other controllers from Microchip, the
comparator function, internal voltage reference and tim-
ers can be used to digitize an analog signal.
Some of the standard PICmicros have a comparator
module, consisting of two comparators, both of which
can be connected to PORTA in a variety of configura-
tions. The internal voltage reference divider can be
used with the comparators to establish thresholds.
Additionally, 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, a
first order modulator and first order filter can be
designed, emulating the function of an analog-to-digital
delta-sigma conversion.M AN700
Make a Delta-Sigma Converter Using a Microcontroller’s
Analog Comparator Module
This method of conversion is quickly implemented in
Authors: Dieter Peter rmware with very few additional external components.
Bonnie C. Baker Consequently, the cost of hardware implementation is
Dan Butler minimal, particularly for such a high resolution con-
Hartono Darmawaskita
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