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AD9830 Arkusz danych(PDF) 6 Page - Analog Devices |
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AD9830 Arkusz danych(HTML) 6 Page - Analog Devices |
6 / 16 page AD9830 REV. A –6– TERMINOLOGY Integral Nonlinearity This is the maximum deviation of any code from a straight line passing through the endpoints of the transfer function. The endpoints of the transfer function are zero scale, a point 0.5 LSB below the first code transition (000 . . . 00 to 000 . . . 01) and full scale, a point 0.5 LSB above the last code transition (111 . . . 10 to 111 . . . 11). The error is expressed in LSBs. Differential Nonlinearity This is the difference between the measured and the ideal 1 LSB change between two adjacent codes in the DAC. Signal to (Noise + Distortion) Signal to (Noise + Distortion) is measured signal to noise at the output of the DAC. The signal is the rms magnitude of the fun- damental. Noise is the rms sum of all the nonfundamental sig- nals up to half the sampling frequency (fMCLK/2) but excluding the dc component. Signal to (Noise + Distortion) is dependent on the number of quantization levels used in the digitization process; the more levels, the smaller the quantization noise. The theoretical Signal to (Noise + Distortion) ratio for a sine wave input is given by Signal to (Noise + Distortion) = (6.02 N + 1.76) dB where N is the number of bits. Thus, for an ideal 10-bit con- verter, Signal to (Noise + Distortion) = 61.96 dB. Total Harmonic Distortion Total Harmonic Distortion (THD) is the ratio of the rms sum of harmonics to the rms value of the fundamental. For the AD9830, THD is defined as THD = 20log (V2 2 +V 3 2 +V 4 2 +V 5 2 +V 6 2 V1 where V1 is the rms amplitude of the fundamental and V2, V3, V4, V5 and V6 are the rms amplitudes of the second through the sixth harmonic. Output Compliance The output compliance refers to the maximum voltage which can be generated at the output of the DAC to meet the specifi- cations. When voltages greater than that specified for the out- put compliance are generated, the AD9830 may not meet the specifications listed in the data sheet. For the AD9830, the maximum voltage which can be generated by the DAC is 1V. Spurious Free Dynamic Range Along with the frequency of interest, harmonics of the funda- mental frequency and images of the MCLK frequency will be present at the output of a DDS device. The spurious free dy- namic range (SFDR) refers to the largest spur or harmonic which is present in the band of interest. The wideband SFDR gives the magnitude of the largest harmonic or spur relative to the magnitude of the fundamental frequency in the bandwidth ±2 MHz about the fundamental frequency. The narrowband SFDR gives the attenuation of the largest spur or harmonic in a bandwidth of ±200 kHz and ±50 kHz about the fundamental frequency. Clock Feedthrough There will be feedthrough from the MCLK input to the analog output. The clock feedthrough refers to the magnitude of the MCLK signal relative to the fundamental frequency in the AD9830’s output spectrum. |
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