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ADC084S021 Folha de dados(PDF) 8 Page - Texas Instruments |
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ADC084S021 Folha de dados(HTML) 8 Page - Texas Instruments |
8 / 27 page 2 1 f 2 6 f 2 2 f 10 ‡ A A + + A log 20 = THD ADC084S021 SNAS279E – APRIL 2005 – REVISED MARCH 2013 www.ti.com EFFECTIVE NUMBER OF BITS (ENOB, or EFFECTIVE BITS) is another method of specifying Signal-to-Noise and Distortion or SINAD. ENOB is defined as (SINAD − 1.76) / 6.02 and says that the converter is equivalent to a perfect ADC of this (ENOB) number of bits. FULL POWER BANDWIDTH is a measure of the frequency at which the reconstructed output fundamental drops 3 dB below its low frequency value for a full scale input. FULL SCALE ERROR (FSE) is a measure of how far the last code transition is from the ideal 1½ LSB below VREF+ and is defined as: VFSE = Vmax + 1.5 LSB – VREF+ where • Vmax is the voltage at which the transition to the maximum code occurs • FSE can be expressed in Volts, LSB or percent of full scale range (1) GAIN ERROR is the deviation of the last code transition (111...110) to (111...111) from the ideal (VREF − 1.5 LSB), after adjusting for offset error. INTEGRAL NON-LINEARITY (INL) is a measure of the deviation of each individual code from a line drawn from negative full scale (½ LSB below the first code transition) through positive full scale (½ LSB above the last code transition). The deviation of any given code from this straight line is measured from the center of that code value. INTERMODULATION DISTORTION (IMD) is the creation of additional spectral components as a result of two sinusoidal frequencies being applied to the ADC input at the same time. It is defined as the ratio of the power in the second and third order intermodulation products to the sum of the power in both of the original frequencies. IMD is usually expressed in dB. MISSING CODES are those output codes that will never appear at the ADC outputs. These codes cannot be reached with any input value. The ADC084S021 is ensured not to have any missing codes. OFFSET ERROR is the deviation of the first code transition (000...000) to (000...001) from the ideal (i.e. GND + 0.5 LSB). SIGNAL TO NOISE RATIO (SNR) is the ratio, expressed in dB, of the rms value of the input signal at the converter output to the rms value of the sum of all other spectral components below one-half the sampling frequency, not including d.c. or harmonics included in the THD specification. SIGNAL TO NOISE PLUS DISTORTION (S/N+D or SINAD) Is the ratio, expressed in dB, of the rms value of the input signal to the rms value of all of the other spectral components below half the clock frequency, including harmonics but excluding d.c. SPURIOUS FREE DYNAMIC RANGE (SFDR) is the difference, expressed in dB, between the rms values of the input signal and the peak spurious signal where a spurious signal is any signal present in the output spectrum that is not present at the input, excluding d.c. TOTAL HARMONIC DISTORTION (THD) is the ratio, expressed in dB or dBc, of the rms total of the first five harmonic components at the output to the rms level of the input signal frequency as seen at the output. THD is calculated as where • Af1 is the RMS power of the input frequency at the output • Af2 through Af6 are the RMS power in the first 5 harmonic frequencies (2) THROUGHPUT TIME is the minimum time required between the start of two successive conversion. It is the acquisition time plus the conversion and read out times. In the case of the ADC084S021, this is 16 SCLK periods. 8 Submit Documentation Feedback Copyright © 2005–2013, Texas Instruments Incorporated Product Folder Links: ADC084S021 |
Nº de peça semelhante - ADC084S021_14 |
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Descrição semelhante - ADC084S021_14 |
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