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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD7760 датащи(PDF) 10 Page - Analog Devices |
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AD7760 датащи(HTML) 10 Page - Analog Devices |
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10 / 22 page  AD7760 Preliminary Technical Data Rev. PrN | Page 10 of 22 TERMINOLOGY Signal to (Noise + Distortion) Ratio 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 digitization 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 ( ) ( ) dB N Distortion Noise to Signal 76 . 1 02 . 6 + = + Thus, for an 18-bit converter, this is 110.12dBs and for a 20-bit converter, 122.16 dB. Total Harmonic Distortion (THD) The ratio of the rms sum of harmonics to the fundamental. For the AD7760, it is defined as () 1 2 6 2 5 2 4 2 3 2 2 V V V V V V 20 dB THD + + + + = log where: V1 is the rms amplitude of the fundamental. V2, V3, V4, V5, and V6 are the rms amplitudes of the second to the sixth harmonics. Peak Harmonic or Spurious Noise The ratio of the rms value of the next largest component in the ADC output spectrum (up to fS/2 and excluding dc) to the rms value of the fundamental. Normally, the value of this specification is determined by the largest harmonic in the spectrum, but, for ADCs where the harmonics are buried in the noise floor, it is a noise peak. Non-Harmonic Spurious Free Dynamic Range (SFDR) The ratio of the rms signal amplitude to the rms value of the peak spurious spectral component excluding harmonics. Intermodulation Distortion With inputs consisting of sine waves at two frequencies, fa and fb, any active device with nonlinearities creates distortion products at sum and difference frequencies of mfa ± nfb, where m, n = 0, 1, 2, 3, and so on. Intermodulation distortion terms are those for which neither m nor n are equal to zero. For example, the second-order terms include (fa + fb) and (fa − fb), while the third-order terms include (2fa + fb), (2fa − fb), (fa + 2fb) and (fa − 2fb). The AD7760 is tested using the CCIF standard, where two input frequencies near the top end of the input bandwidth are used. In this case, the second-order terms are usually distanced in frequency from the original sine waves, while the third-order terms are usually at a frequency close to the input frequencies. As a result, the second- and third-order terms are specified separately. The calculation of the intermodulation distortion is as per the THD specification, where it is the ratio of the rms sum of the individual distortion products to the rms amplitude of the sum of the fundamentals expressed in dB. Integral Nonlinearity (INL) The maximum deviation from a straight line passing through the endpoints of the ADC transfer function. Differential Nonlinearity (DNL) The difference between the measured and the ideal 1 LSB change between any two adjacent codes in the ADC. Offset Error The deviation of the first code transition (000...000 to 000...001) from the ideal (that is, AGND + 1 LSB). Gain Error The deviation of the last code transition (111...110 to 111...111) from the ideal (that is, VREF − 1 LSB), after the offset error has been adjusted out. Power Supply Rejection Ratio (PSRR) The ratio of the power in the ADC output at full-scale frequency, f, to the power of a 100 mV p-p sine wave applied to the ADC VDD supply of frequency fs. The frequency of this input varies from 1 kHz to 1 MHz. ( ) ( ) Pfs Pf dB PSRR log 10 = Pf is the power at frequency f in the ADC output; Pfs is the power at frequency fs in the ADC output. |
Аналогичный номер детали - AD7760 |
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Аналогичное описание - AD7760 |
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