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ADC102S021 데이터시트(PDF) 7 Page - Texas Instruments |
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ADC102S021 데이터시트(HTML) 7 Page - Texas Instruments |
7 / 26 page tCSU tCLH SCLK CS SCLK ADC102S021 www.ti.com SNAS281G – FEBRUARY 2005 – REVISED MARCH 2013 Figure 5. ADC102S021 Serial Timing Diagram Figure 6. SCLK and CS Timing Parameters Specification Definitions ACQUISITION TIME is the time required to acquire the input voltage. That is, it is time required for the hold capacitor to charge up to the input voltage. APERTURE DELAY is the time between the fourth falling SCLK edge of a conversion and the time when the input signal is acquired or held for conversion. CONVERSION TIME is the time required, after the input voltage is acquired, for the ADC to convert the input voltage to a digital word. CROSSTALK is the coupling of energy from one channel into the other channel, or the amount of signal energy from one analog input that appears at the measured analog input. DIFFERENTIAL NON-LINEARITY (DNL) is the measure of the maximum deviation from the ideal step size of 1 LSB. DUTY CYCLE is the ratio of the time that a repetitive digital waveform is high to the total time of one period. The specification here refers to the SCLK. 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 Copyright © 2005–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: ADC102S021 |
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