achieving multiply the analog input and digital data R.SINθ conversion circuit

Published:2011/5/12 5:06:00 Author:Fiona | Keyword: achieving multiply the analog input and digital data, R.SINθ conversion | From:SeekIC

Circuit function he circuit outputs Y (Y = R. SINθ) function (in Figure A,X, Y is as coordinates, R is representative of the analog input, Y is representative of the function output),θ's selected range is 0 to 90 degrees.90 to 180 degrees and 0 to 90 happens is reciprocal.To make the data can wait until 180 degrees, the control signal uses two BCD code +1 data bits. Circuit Work This is an analog input and digital data multiplication circuit which does the R computing and the digital data values is from 0 to 255.In advance, make the ROM data corresponding to the sine function good,because AD7523 is a positive logic input,SIN0 degree = 0, D = 00; SIN90 degree = 1, D = FFH (255/255 ≈ 1).Calculate SIN0 ~ 90 degrees to a degree level,then multiply by 25and switch to binary data to store in the P-ROM.



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