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ADC Converter Function Pack Design Guide 15

High-Performance, Stand-Alone ADCs for a Variety of Embedded Systems Applications

RELATED SUPPORT MATERIAL

The following Application Notes are available on the Microchip

website: www.microchip.com.

Application Notes:

AN246: Driving the Analog Inputs of a SAR A/D Converter

Driving any A/D Converter (ADC) can be challenging if all

issues and trade-offs are not understood from the beginning.

With Successive Approximation Register (SAR) ADCs, the

sampling speed and source impedance should be taken into

consideration if the device is to be fully utilized. This application

note discusses the issues surrounding the SAR converter’s

input and conversion nuances to insure that the converter is

handled properly from the beginning of the design phase.

AN681:

Reading and Using Fast Fourier Transformation (FFT)

This application note focuses on the use of FFT plots to

illustrate the performance of A/D converters. FFTs can help

identify noise interference, power supply, and analog device

performance.

AN688: Layout Tips for 12-Bit A/D Converter Application

This application note describes basic A/D converter layout

guidelines, ending with a review of issues to be aware of.

Examples of good and bad layout techniques are provided.

AN693: Understanding A/D Converter Performance

Specifications.

This application note describes the specications

used to quantify the performance of A/D converters and gives

the reader a better understanding of the signicance of those

specications in an application.

AN695: Interfacing Pressure Sensors to Microchip’s Analog

Peripherals This application note concentrates on the signal

conditioning path of the piezoresistive sensing element from

sensor to microcontroller. It shows how the electrical output

of this sensor can be gained, ltered and digitized in order to

prepare it for the microcontroller’s calibration routines.

AN780:

15-Kilogram Scale Using the TC500A and the TC520

A 15 kg weighing scale was designed using Microchip’s TC500A

Analog Processor and the TC520 16-bit Controller. The scale is

required to resolve down to 1/8 gram and correct to within 6-1/2

grams.

AN781: Solving Sensor Offset Problems with TC7106

Design engineers sometimes have to interface the TC7106

and similar ADCs to “non-ideal” sensors. A very common

problem is that the sensor often does not give a “zero” output

where the design wants a zero reading.

AN783:

±5V Power Supply Operation with TC7106A/7107A

This application note describes how the TC7106A/7107A

3-1/2 digit analog-to-digital converters with liquid crystal

display drive can be powered from ±5V power supplies using

low-cost regulators, such as the TC55 (+5V).

AN785: Simplify A/D Converter Interface with Software

Unfortunately, many display-oriented ADCs are difcult to

interface due to the multiplexed BCD format of the outputs.

An exception is the 4-1/2 digit TC7135 ADC, which provides a

“strobe” output.

AN788: Numerical-Integration Techniques Speed Dual-Slope

A/D Conversion. By using low-cost microprocessors and a

program-controlled, numerical-integration technique, you can

achieve good noise rejection and take full advantage of the

higher speeds offered by dual-slope A/D converters, such as

the TC7109.

AN789: Integrating Converter Analog Processor – TC500A

Today, design engineers rely more on microprocessors and

microcontrollers to support their applications. Compatible

Analog-to-Digital (A/D) and Digital-to-Analog (D/A) converters

have greatly increased the exibility of interface and control

circuits.

AN796: TC7109 Records Remote Data Automatically

The TC7109 analog-to-digital converter, a 2 Kbytes CMOS

static RAM, and some gates and counters can be combined

to form a low-cost, exible, stand-alone data-logging system.

AN842:

Differential ADC Biasing Techniques, Tips and Tricks

This application note discusses differential input configurations

and their operation circuits to implement these input modes

and techniques in choosing the correct voltage levels.

AN845: Communicating with The MCP3221 Using PICmicro®

Microcontrollers. This application note covers communications

between the MCP3221 device and a PICmicro® microcontroller.

Hardware and software implementations of the I

C™ protocol

are covered.

Demonstration/Evaluation Board and User Guide:

MCP3XXX Evaluation Kit User’s Guide (DS51220):

This document describes how to use the MCP3XXX Evaluation

Board to evaluate Microchip’s stand-alone MCP3XXX A/D

converters.

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