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ADCV08832 データシート(PDF) 11 Page - National Semiconductor (TI) |
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ADCV08832 データシート(HTML) 11 Page - National Semiconductor (TI) |
11 / 14 page Functional Description (Continued) digitally analyze the frequency components of the signal. Depending on the application, further digital processing can be applied. 6.1 Sampling Rate The Sampling Rate, sometimes referred to as the Through- put Rate, is the time between repetitive samples by an Analog-to-Digital Converter. The sampling rate includes the conversion time, as well as other factors such a MUX setup time, acquisition time, and interfacing time delays. Typically, the sampling rate is specified in the number of samples taken per second, at the maximum analog-to-digital con- verter clock frequency. Signals with frequencies exceeding the Nyquist frequency (1/2 the sampling rate), will be aliased into frequencies be- low the Nyquist frequency. To prevent signal degradation, sample at twice (or more) than the highest frequency com- ponent of the input signal and/or use of a low pass (anti-aliasing) filter on the front-end. Sampling at a much higher rate than the input signal will reduce the requirements of the anti-aliasing filter. 6.2 Signal-to-Noise Ratio Signal-to-Noise Ratio (SNR) is the ratio of RMS magnitude of the fundamental to the RMS sum of all the non-fundamental signal, excluding the harmonics, up to 1/2 of the sampling frequency (Nyquist). 6.3 Total Harmonic Distortion Total Harmonic distortion is the ratio of the RMS sum of the amplitude of the harmonics to the fundamental input fre- quency. THD = 20 log [(V 2 2 +V 3 2+V 4 2+V 5 2+V 6 2) 1/2/V 1] Where V 1 is the RMS amplitude of the fundamental and V 2,V3,V4,V5,V6 are the RMS amplitudes of the individual harmonics. In theory, all harmonics are included in THD calculations, but in practice only about the first 6 make significant contributions and require measurement. 6.4 Signal-to-Noise and Distortion Signal-to-Noise And Distortion ratio (SINAD) is the ratio of RMS magnitude of the fundamental to the RMS sum of all the non-fundamental signals, including the noise and har- monics, up to 1/2 of the sampling frequency (Nyquist), ex- cluding DC. SINAD is also dependent on the number of quantization levels in the A/D Converter used in the waveform sampling process. The more quantization levels, the smaller the quan- tization noise and theoretical noise performance. The theo- retical SINAD for a n-Bit Analog-to-Digital Converter is given by: SINAD = (6.02 n + 1.76) dB Thus, for an 8-bit converter, the ideal SINAD = 49.92 dB 6.5 Effective Number of Bits Effective Number Of Bits (ENOB) is another specification to quantify dynamic performance. The equation for ENOB is given by: ENOB = [(SINAD - 1.76) / 6.02] Like SINAD, the Effective Number Of Bits combines the cumulative effect of several errors, including quantization, ADC non-linearities, noise, and distortion. 6.6 Spurious Free Dynamic Range Spurious Free Dynamic Range (SFDR) is the ratio of the signal amplitude to the amplitude of the highest harmonic or spurious noise component. If the amplitude is at full scale, the specification is simply the reciprocal of the peak har- monic or spurious noise. Applications Protecting the Input DS200084-9 www.national.com 11 |
同様の部品番号 - ADCV08832 |
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同様の説明 - ADCV08832 |
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