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ADC122S101 bảng dữ liệu(PDF) 8 Page - Texas Instruments |
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ADC122S101 bảng dữ liệu(HTML) 8 Page - Texas Instruments |
8 / 25 page 2 1 f 2 6 f 2 2 f 10 ‡ A A + + A log 20 = THD ADC122S101 SNAS286C – MARCH 2005 – REVISED JANUARY 2010 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+ (1) 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. 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 that are present at the output and are not present at the input and result from two sinusoidal frequencies being applied to the ADC input at the same time. It is defined as the ratio of the power in the intermodulation products to the total power in one 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 ADC122S101 is guaranteed 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 desired signal amplitude to the amplitude of the peak spurious spectral component, where a spurious spectral component is any signal present in the output spectrum that is not present at the input and may or may not be a harmonic. 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 (2) where Af1 is the RMS power of the input frequency at the output and Af2 through Af6 are the RMS power in the first 5 harmonic frequencies. Accurate THD measurement requires a spectrally pure sine wave (monotone) at the ADC input. THROUGHPUT TIME is the minimum time required between the start of two successive conversion. It is the acquisition time plus the conversion time. In the case of the ADC122S101, this is 16 SCLK periods. 8 Submit Documentation Feedback Copyright © 2005–2010, Texas Instruments Incorporated Product Folder Links: ADC122S101 |
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