For simplicity, however, the default setting of the Crunching FFTs spreadsheets hides the intermediate detailed calculations. Excel records all the intermediate steps from raw ADC data to a FFT plot, which the user can then explore by analyzing the equation for each spreadsheet cell. Using Excel to crunch FFTs has its benefits. The user is simply required to enter three variables and the ADC data record. They provide a formatted single-tone FFT plot from the user's data. The " Crunching_FFTs_Excel-2003" and " Crunching_FFTs_Excel-2007" spreadsheets have been automated using macros for ease of use. This application note introduces an Excel spreadsheet that crunches the output code of an ADC into its FFT components. MATLAB is very popular in the industry however, MATLAB is not as ubiquitous as Microsoft Excel, and in 2004 Mathworks was charging approximately $3000 (USD) for its basic MATLAB software, along with the signal processing toolbox and annual licensing agreement. Other FFT crunching programs use MATLABĀ®. While these custom programs are handy, the C source code is not always available. Many of these programs are custom applications written by a C programmer. Numerous programs are available to process ("crunch") the output code of an ADC into its FFT components. Fast Fourier Transforms (FFTs) are a powerful tool for evaluating the dynamic performance of analog-to-digital converters (ADCs).
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