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SX8725S Datasheet(PDF) 27 Page - Semtech Corporation |
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SX8725S Datasheet(HTML) 27 Page - Semtech Corporation |
27 / 69 page www.semtech.com Page 27 ADVANCED COMMUNICATIONS & SENSING DATASHEET SX8725S ZoomingADC for sensing data acquisition Revision 1.0 February 2011 © Semtech As already mentioned, NELCONV must be equal or greater than 2 to reduce internal amplifier offsets. 7.7.5 Resolution The theoretical resolution of the ADC, without considering thermal noise, is given by: Using look-up Table 16 or the graph plotted in Figure 13, resolution can be set between 6 and 16 bits. Notice that, because of 16-bit register use for the ADC output, practical resolution is limited to 16 bits, i.e. n = 16. Even if the Table 15. Number of elementary conversion SetOsr[2:0] (RegACCfg[4:2]) # of Elementary Conversion NELCONV [-] 00 1 01 2 10 4 11 8 Equation 16 Figure 13. Resolution vs. SetOsr[2:0] and SetNelconv[2:0] ] [ ) ( log ) ( log 2 2 2 bit N OSR n ELCONV + ⋅ = 14.0 12.0 8.0 6.0 4.0 000 010 100 SetOsr[2:0] 16.0 10.0 00 01 10 11 001 011 101 110 111 SetNelconv[1:0] |
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