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ADC16V130 Datasheet(PDF) 11 Page - Texas Instruments |
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ADC16V130 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 29 page 2 2 f + THD = 10 log 20 2 3 f + . . . 2 8 f + 2 1 f ADC16V130 www.ti.com SNAS458D – NOVEMBER 2008 – REVISED MAY 2010 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 intermodulation products to the total power in the original frequencies. IMD is usually expressed in dBFS. LSB (LEAST SIGNIFICANT BIT) is the bit that has the smallest value or weight of all bits. This value is VFS/2 n, where “VFS” is the full scale input voltage and “n” is the ADC resolution in bits. MISSING CODES are those output codes that will never appear at the ADC outputs. The ADC16V130 is guaranteed not to have any missing codes. MSB (MOST SIGNIFICANT BIT) is the bit that has the largest value or weight. Its value is one half of full scale. NEGATIVE FULL SCALE ERROR is the difference between the actual first code transition and its ideal value of ½ LSB above negative full scale. OFFSET ERROR is the difference between the two input voltages (VIN+ – VIN-) required to cause a transition from code 32767LSB and 32768LSB with offset binary data format. PIPELINE DELAY (LATENCY) See CONVERSION LATENCY. POSITIVE FULL SCALE ERROR is the difference between the actual last code transition and its ideal value of 1½ LSB below positive full scale. SIGNAL TO NOISE RATIO (SNR) is the ratio, expressed in dB, of the power of input signal to the total power of all other spectral components below one-half the sampling frequency, not including harmonics and DC. SIGNAL TO NOISE AND DISTORTION (SINAD) Is the ratio, expressed in dB, of the power of the input signal to the total power of all of the other spectral components below half the clock frequency, including harmonics but excluding DC. SPURIOUS FREE DYNAMIC RANGE (SFDR) is the difference, expressed in dB, between the power of input signal and the peak spurious signal power, where a spurious signal is any signal present in the output spectrum that is not present at the input. TOTAL HARMONIC DISTORTION (THD) is the ratio, expressed in dB, of the total power of the first seven harmonic to the input signal power. THD is calculated as: (9) where f1 2 is the power of the fundamental frequency and f 2 2 through f 8 2 are the powers of the first seven harmonics in the output spectrum. SECOND HARMONIC DISTORTION (2ND HARM or H2) is the difference expressed in dB, from the power of its 2nd harmonic level to the power of the input signal. THIRD HARMONIC DISTORTION (3RD HARM or H3) is the difference expressed in dB, from the power of the 3nd harmonic level to the power of the input signal. HIGHEST SPURIOUS EXCEPT H2 and H3 (Spur-H2/3) is the difference, expressed in dB, between the power of input signal and the peak spurious signal power except H2 and H3, where a spurious signal is any signal present in the output spectrum that is not present at the input. Copyright © 2008–2010, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: ADC16V130 |
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