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AD7927 数据表(PDF) 9 Page - Analog Devices |
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AD7927 数据表(HTML) 9 Page - Analog Devices |
9 / 28 page Data Sheet AD7927 Rev. D | Page 9 of 28 Signal-to-(Noise + Distortion) Ratio (SINAD) This is the measured ratio of signal-to-(noise + distortion) at the output of the ADC. The signal is the rms amplitude of the fundamental. Noise is the sum of all nonfundamental signals up to half the sampling frequency (fS/2), excluding dc. The ratio is dependent on the number of quantization levels in the digiti- zation process; the more levels, the smaller the quantization noise. The theoretical signal-to-(noise + distortion) ratio for an ideal N-bit converter with a sine wave input is given by Signal-to-(Noise + Distortion) = (6.02N + 1.76)dB Thus, for a 12-bit converter, this is 74 dB. Figure 5 shows the signal-to-(noise + distortion) ratio performance vs. input fre- quency for various supply voltages while sampling at 200 kSPS with an SCLK of 20 MHz. Total Harmonic Distortion (THD) THD is the ratio of the rms sum of harmonics to the fundamental. For the AD7927, it is defined as: 1 2 6 2 5 2 4 2 3 2 2 log 20 ) dB ( V V V V V V THD where: V1 is the rms amplitude of the fundamental. V2, V3, V4, V5, and V6 are the rms amplitudes of the second through the sixth harmonics. Figure 7 shows a graph of total harmonic distortion vs. analog input frequency for various supply voltages, and Figure 8 shows a graph of total harmonic distortion vs. analog input frequency for various source impedances (see the Analog Input section). |
类似零件编号 - AD7927_15 |
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类似说明 - AD7927_15 |
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