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Session 2559

Using MATLAB And LabView® Software To Determine Current Array Outputs Of A Segmented Current Steering Digital To Analog Converter Charles C. Bittle University of North Texas

Abstract This paper describes MATLAB software, LabView® software, instrumentation, acquisition of test data and calculations to determine the output of each current cell pair in the current array 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. LabView® software was used for instrument control and data acquisition. MATLAB software was used to process data, to calculate current cell pair outputs, and to plot the results to determine if there were major problem areas in the current array. Plots showed no problem areas.

I. Introduction Texas Instruments invited the author to learn about the THS5651IDW, a new high-speed digital to analog converter (DAC), being designed at their facility on Forest Lane, Dallas Texas. This knowledge is being passed on to students in the Electronic Engineering Technology program at the University of North Texas. The THS5651IDW DAC is a prototype of the future Texas Instruments TLV5651, 10-bit, 125 MHz communications DAC. This high-speed DAC will be used in cellular telephone base stations to assist in reducing saturation of base station circuits during peak periods. The THS5651IDW DAC has a diagonal pattern for its segmented current array. The author made a study of this pattern to determine if there were major problem areas associated with using a diagonal pattern to overcome output differences in adjacent current cells. Texas Instruments provided 36 THS5651IDW DACs and the use of their laboratory facility. LabView® software was used for instrument control and data acquisition. MATLAB software was used for calculations and plotting data. Calculations were made for all 36 DACs. Texas Instruments required a gray-scale plot of DAC 10 data and the average data of all 36 DACs.

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 conversion of a digital number into an analog signal as shown in Figure 1. The conversion can be accomplished in terms of voltage, current, and charge division using resister ladders, current steering circuits, and switched Proceedings of the 2002 American Society for Engineering Education Annual Conference & Exposition Copyright  2002, American Society for Engineering Education

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Bittle, C. (2002, June), Using Matlab And Labview Software To Determine Current Array Outputs Of A Segmented Current Steering Digital To Analog Converter Paper presented at 2002 Annual Conference, Montreal, Canada. 10.18260/1-2--11306