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LMT87-Q1 Datasheet(PDF) 10 Page - Texas Instruments |
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LMT87-Q1 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 29 page (-13.6 mV / oC) u V = T + 2637 mV (-13.6 mV / oC) u V - 2365 mV = (T - 20 oC) 1958 mV - 2365 mV 50 oC - 20oC u ¹ · V - 2365 mV = (T - 20 oC) V2 - V1 T2 - T1 u ¹ · V - V1 = (T - T1) 30 ) 00433 . 0 ( 2 mV V 8 . 2230 00433 . 0 4 582 . 13 582 . 13 T TEMP 2 u u u ª º ª º « » « » ¬ ¼ ¬ ¼ 2 TEMP 2 mV mV V mV = 2230.8mV - 13.582 T - 30°C - 0.00433 T - 30°C °C °C LMT87, LMT87-Q1 SNIS170C – JAN 2014 – REVISED OCTOBER 2015 www.ti.com Table 1. LMT87/LMT87-Q1 Transfer Table (continued) TEMP VOUT TEMP VOUT TEMP VOUT TEMP VOUT TEMP VOUT (°C) (mV) (°C) (mV) (°C) (mV) (°C) (mV) (°C) (mV) -32 3056 8 2527 48 1985 88 1427 128 858 -31 3043 9 2513 49 1971 89 1413 129 843 -30 3030 10 2500 50 1958 90 1399 130 829 -29 3017 11 2486 51 1944 91 1385 131 814 -28 3004 12 2473 52 1930 92 1371 132 800 -27 2991 13 2459 53 1916 93 1356 133 786 -26 2978 14 2446 54 1902 94 1342 134 771 -25 2965 15 2433 55 1888 95 1328 135 757 -24 2952 16 2419 56 1875 96 1314 136 742 -23 2938 17 2406 57 1861 97 1300 137 728 -22 2925 18 2392 58 1847 98 1286 138 713 -21 2912 19 2379 59 1833 99 1272 139 699 -20 2899 20 2365 60 1819 100 1257 140 684 -19 2886 21 2352 61 1805 101 1243 141 670 -18 2873 22 2338 62 1791 102 1229 142 655 -17 2859 23 2325 63 1777 103 1215 143 640 -16 2846 24 2311 64 1763 104 1201 144 626 -15 2833 25 2298 65 1749 105 1186 145 611 -14 2820 26 2285 66 1735 106 1172 146 597 -13 2807 27 2271 67 1721 107 1158 147 582 -12 2793 28 2258 68 1707 108 1144 148 568 -11 2780 29 2244 69 1693 109 1130 149 553 150 538 Although the LMT87 and LMT87-Q1 is very linear, its response does have a slight umbrella parabolic shape. This shape is very accurately reflected in Table 1. The Transfer Table can be calculated by using the parabolic equation. (1) The parabolic equation is an approximation of the transfer table and the accuracy of the equation degrades slightly at the temperature range extremes. Equation 1 can be solved for T resulting in: (2) For an even less accurate linear transfer function approximation, a line can easily be calculated over the desired temperature range from the Table using the two-point equation: (3) Where V is in mV, T is in °C, T1 and V1 are the coordinates of the lowest temperature, T2 and V2 are the coordinates of the highest temperature. For example, if we want to resolve this equation, over a temperature range of 20°C to 50°C, we would proceed as follows: (4) (5) (6) Using this method of linear approximation, the transfer function can be approximated for one or more temperature ranges of interest. 10 Submit Documentation Feedback Copyright © 2014–2015, Texas Instruments Incorporated Product Folder Links: LMT87 LMT87-Q1 |
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