Mixed Signal PICtail? Demo Board User’s Guide
ABOUT THIS GUIDE
Document Layout
This document describes how to use the Mixed Signal PICtail? Demo Board. The
manual layout is as follows:
? Chapter 1. Product Overview – Important information about the Mixed Signal
PICtail? Demo Board.
? Chapter 2. Installation and Operation – Includes instructions on how to get
started with this demo board and a detailed description of each function of the
demo board.
? Appendix A. Schematics and Layouts – Shows the schematic and layout
diagrams for the Mixed Signal PICtail? Demo Board.
? Appendix B. Bill-Of-Materials (BOM) – Lists the parts used to build the Mixed
Signal PICtail? Demo Board.
? Appendix C. MixedSignal_V100.asm Description – Example “Main” assembly
firmware for the PIC16F767-I/SS microcontroller used to demonstrate the various
features of the supported analog products.
? Appendix D. DAC_dtmf.asm Source Code – Example assembly source
firmware used to generate Dual Tone Multiple Frequency (DTMF) signals. This
firmware is utilized by the “Main” firmware, MixedSignal_v100.ASM .
? Appendix E. MixedSignal_16f767i.lkr Source Code – Linker script file used to
build the example PIC16F767 firmware.
? Appendix F. DTMF Scope Captures – Oscilloscope screen captures of the
various DTMF tones displaying their FFT to illustrate the quality of the DTMF
tones.
? Appendix G. Scope Probe Noise Captures – Isolating scope probe noise is
challenging. These scope captures illustrate the difference between using a
standard scope probe and using coaxial cable directly from the board into the
scope.
? Appendix H. Sine Wave and Filtered DTMF Scope Captures – Oscilloscope
screen capture of the 32-step sine wave routine and the DTMF waveform. The
DTMF waveform illustrates the non-filtered DAC output and a simple RC-filtered
output.
? Appendix I. MPLAB? IDE Screen Capture – MPLAB IDE 6.3x was used to gen-
erate the example source firmware. This screen capture illustrates the tool, the
project files and the included Watch windows.
DS51523A-page 2
? 2004 Microchip Technology Inc.
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