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Session 2559

Linearity and Monotonicity of a 10-bit, 125 MHz, Segmented Current Steering Digital to Analog Converter Charles C. Bittle, Perry R. McNeill University of North Texas

Abstract

This paper describes instrumentation, software and acquisition of test data to determine the linearity and monotonicity of the THS5651IDW digital to analog converter (DAC), a prototype of the future Texas Instruments TLV5651, 10-bit, 125 MHz communication DAC. The THS5651IDW is a 5-4-1 segmented current steering DAC. Data was collected at the Texas Instruments’ facility on Forest Lane, Dallas Texas. Instruments, software, and laboratory space was provided by Texas Instruments. LabView® software was used for instrument control, data acquisition, and calculation of linearity data. Linearity data is expressed as differential nonlinearity (DNL) and integral nonlinearity (INL). Analysis of the data found the THS5651IDW DAC to be monotonic since the magnitude of the DNL were less than ± 1 LSB and the INL were less than ± 0.5 LSB.

I. Introduction

The Electronics Engineering Technology program at the University of North Texas has a limited budget and facilities to provide research projects for graduate students. These limitations can be overcome by using services of Industrial Advisory Committees (IAC). These committees can contribute significantly to the growth and development of engineering technology programs at universities not only as a means of assuring technical currency of the program but providing research projects for graduate students and senior design projects for undergraduate students. Presidents, Chief Operations Officers, and Chief Engineers of corporations in the Dallas/Fort Worth, Texas area are members of the University of North Texas Electronics Engineering Technology IAC. These members can steer graduate students to company groups that have research projects available. This paper describes one such project obtained in that manner. It is also one part of the first author’s Thesis. The teaching of segmented current steering DACs was added to courses ELET 2740 Electronics II, ELET 3970 Electronic Devices and Controls, and ELET 5330 Instrumentation Systems Design in the Department of Engineering Technology as a results of this study.

Digital-to-analog converters (DACs) are devices by which digital processors communicate with the analog world. Although DACs are used as key elements in analog-to-digital converters (ADCs), they find numerous applications as stand-alone devices from Cathode Ray Tube displays to modern digital communication systems. The basic function of the DAC is the

Proceedings of the 2001 American Society for Engineering Education Annual Conference & Exposition Copyright  2001, American Society for Engineering Education

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McNeill, P. R., & Bittle, C. (2001, June), Linearity And Monotonicity Of A 10 Bit, 125 M Hz, Segmented Current Steering Digital To Analog Converter Paper presented at 2001 Annual Conference, Albuquerque, New Mexico. 10.18260/1-2--9516