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AD9833SRMZ-EP-RL7 Datasheet(PDF) 10 Page - Analog Devices |
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AD9833SRMZ-EP-RL7 Datasheet(HTML) 10 Page - Analog Devices |
10 / 24 page AD9833 Data Sheet Rev. E | Page 10 of 24 TERMINOLOGY Integral Nonlinearity (INL) INL is the maximum deviation of any code from a straight line passing through the endpoints of the transfer function. The end- points 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 (DNL) DNL is the difference between the measured and ideal 1 LSB change between two adjacent codes in the DAC. A specified DNL of ±1 LSB maximum ensures monotonicity. Output Compliance Output compliance refers to the maximum voltage that can be generated at the output of the DAC to meet the specifications. When voltages greater than that specified for the output compli- ance are generated, the AD9833 may not meet the specifications listed in the data sheet. Spurious-Free Dynamic Range (SFDR) Along with the frequency of interest, harmonics of the funda- mental frequency and images of these frequencies are present at the output of a DDS device. SFDR refers to the largest spur or harmonic present in the band of interest. The wideband SFDR gives the magnitude of the largest spur or harmonic relative to the magnitude of the fundamental frequency in the zero to Nyquist bandwidth. The narrow-band SFDR gives the attenuation of the largest spur or harmonic in a bandwidth of ±200 kHz about the fundamental frequency. Total Harmonic Distortion (THD) THD is the ratio of the rms sum of harmonics to the rms value of the fundamental. For the AD9833, THD is defined as 1 2 6 2 5 2 4 2 3 2 2 log 20 THD V V V V V V + + + + = where: V1 is the rms amplitude of the fundamental. V2, V3, V4, V5, and V6 are the rms amplitudes of the second through sixth harmonics. Signal-to-Noise Ratio (SNR) SNR is the ratio of the rms value of the measured output signal to the rms sum of all other spectral components below the Nyquist frequency. The value for SNR is expressed in decibels. Clock Feedthrough There is feedthrough from the MCLK input to the analog output. Clock feedthrough refers to the magnitude of the MCLK signal relative to the fundamental frequency in the output spectrum of the AD9833. |
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