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ADS1278-SP Scheda tecnica(PDF) 28 Page - Texas Instruments |
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ADS1278-SP Scheda tecnica(HTML) 28 Page - Texas Instruments |
28 / 57 page v −VREF 223 223 * 1 * VREF 223 * 1 ) VREF 223 * 1 100 0 Conversions(1/f DATA) 0 20 10 40 30 60 50 80 70 FullySettledData at76Conversions (78Conversionsfor High-Resolutionmode) InitialValue FinalValue 28 ADS1278-SP SBAS937 – SEPTEMBER 2018 www.ti.com Product Folder Links: ADS1278-SP Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated 8.3.3 Phase Response The ADS1278-SP incorporates a multiple stage, linear phase digital filter. Linear phase filters exhibit constant delay time versus input frequency (constant group delay). This characteristic means the time delay from any instant of the input signal to the same instant of the output data is constant and is independent of input signal frequency. This behavior results in essentially zero phase errors when analyzing multi-tone signals. 8.3.4 Settling Time As with frequency and phase response, the digital filter also determines settling time. Figure 62 shows the output settling behavior after a step change on the analog inputs normalized to conversion periods. The X-axis is given in units of conversion. Note that after the step change on the input occurs, the output data change very little prior to 30 conversion periods. The output data are fully settled after 76 conversion periods for High-Speed and Low- Power modes, and 78 conversion periods for High-Resolution mode. Figure 62. Step Response 8.3.5 Data Format The ADS1278-SP outputs 24 bits of data in twos complement format. A positive full-scale input produces an ideal output code of 7FFFFFh, and the negative full-scale input produces an ideal output code of 800000h. The output clips at these codes for signals exceeding full-scale. Table 3 summarizes the ideal output codes for different input signals. Table 3. Ideal Output Code Versus Input Signal INPUT SIGNAL VIN (AINP – AINN) IDEAL OUTPUT CODE(1) ≥ +VREF 7FFFFFh 000001h 0 000000h FFFFFFh 800000h (1) Excludes effects of noise, INL, offset, and gain errors. |
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