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ADS1601 Arkusz danych(PDF) 6 Page - Texas Instruments |
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ADS1601 Arkusz danych(HTML) 6 Page - Texas Instruments |
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6 / 30 page  (AINP+AINN) 2 ADS1601 SBAS322D – DECEMBER 2004 – REVISED OCTOBER 2011 www.ti.com DEFINITIONS Absolute Input Voltage Intermodulation Distortion (IMD) Absolute input voltage, given in volts, is the voltage of IMD, given in dB, is measured while applying two each analog input (AINN or AINP) with respect to input signals of the same magnitude, but with slightly AGND. different frequencies. It is calculated as the difference between the rms amplitude of the input signal to the rms amplitude of the peak spurious signal. Aperture Delay Aperture delay is the delay between the rising edge Offset Error of CLK and the sampling of the input signal. Offset Error, given in % of FSR, is the output reading when the differential input is zero. Common-Mode Input Voltage Common-mode input voltage (VCM) is the average Offset Error Drift voltage of the analog inputs: Offset error drift, given in ppm of FSR/ °C, is the drift over temperature of the offset error. The offset error is specified as the larger of the drift from ambient (T = +25 °C) to the minimum or maximum operating Differential Input Voltage temperatures. Differential input voltage (VIN) is the voltage Signal-to-Noise Ratio (SNR) difference between the analog inputs (AINP −AINN). SNR, given in dB, is the ratio of the rms value of the Differential Nonlinearity (DNL) input signal to the sum of all the frequency components below fCLK/2 (the Nyquist frequency) DNL, given in least-significant bits of the output code excluding the first six harmonics of the input signal (LSB), is the maximum deviation of the output code and the dc component. step sizes from the ideal value of 1LSB. Signal-to-Noise and Distortion (SINAD) Full-Scale Range (FSR) SINAD, given in dB, is the ratio of the rms value of FSR is the difference between the maximum and the input signal to the sum of all the frequency minimum measurable input signals (FSR = 1.88VREF). components below fCLK/2 (the Nyquist frequency) including the harmonics of the input signal but Gain Error excluding the dc component. Gain error, given in %, is the error of the full-scale input signal with respect to the ideal value. Spurious-Free Dynamic Range (SFDR) SFDR, given in dB, is the difference between the rms Gain Error Drift amplitude of the input signal to the rms amplitude of Gain error drift, given in ppm/ °C, is the drift over the peak spurious signal. temperature of the gain error. The gain error is specified as the larger of the drift from ambient Total Harmonic Distortion (THD) (T = 25 °C) to the minimum or maximum operating THD, given in dB, is the ratio of the sum of the rms temperatures. value of the first six harmonics of the input signal to the rms value of the input signal. Integral Nonlinearity (INL) INL, given in least-significant bits of the output code (LSB), is the maximum deviation of the output codes from a best fit line. 6 Copyright © 2004–2011, Texas Instruments Incorporated |
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