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This paper is focused on the estimation of the dynamic parameters of a sine-wave by means of the ADS1258EVM-PDK kit. The dynamic parameters are the SIgnal-to-Noise And Distortion (SINAD) ratio, Effective Number Of Bits (ENOB), Total Harmonic Distortion (THD) ratio, and Spurious Free Dynamic Range (SFDR) ratio. These parameters are estimated by both frequency-domain and time-domain methods. In the former approach the estimates are those returned by the MultiFFT test available in the ADCPro evaluation software of the ADS1258EVM-PDK kit or Interpolated Discrete Fourier Transform (IpDFT) algorithm. Conversely, in the latter approach the parameters are estimated by the Multi-Harmonic SineFitting (MHSF) algorithm. The IpDFT and MHSF algorithms are applied to the data acquired by the ADS1258EVM-PDK and are implemented in MATLAB. Moreover, several experimental results achieved by both approaches are carried out and then are compared each other.

In this paper the polynomial approximation of the transfer function of an analog-to-digital converter (ADC) affected by harmonic distortions is investigated. The theoretical expression of the polynomial approximation of the transfer function of an ADC with harmonic components up to 5th order in the case of a sinewave test signal is derived. Also, a practical method to determine the polynomial approximation of an ADC is proposed. The simulation effected confirmed that the results obtained by this method are very accurate. Moreover, an ADC test system, developed to determine the polynomial approximation of the transfer function of an ADC by the proposed method is presented. Some experimental results obtained with this test system are given. Keywords: Analog-to-digital converter (ADC), polynomial approximation of the transfer function of an ADC, interpolated fast Fourier transform (IFFT).