JAJSE58E January   2014  – October 2017 LMT87

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      熱時定数
      2.      出力電圧と温度との関係
  4. 4 改訂履歴
  5. 5 Device Comparison Tables
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Accuracy Characteristics
    6. 7.6 Electrical Characteristics
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 LMT87 Transfer Function
    4. 8.4 Device Functional Modes
      1. 8.4.1 Mounting and Thermal Conductivity
      2. 8.4.2 Output Noise Considerations
      3. 8.4.3 Capacitive Loads
      4. 8.4.4 Output Voltage Shift
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Connection to ADC
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curve
      2. 9.2.2 Conserving Power Dissipation With Shutdown
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
        3. 9.2.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 ドキュメントの更新通知を受け取る方法
    2. 12.2 コミュニティ・リソース
    3. 12.3 商標
    4. 12.4 静電気放電に関する注意事項
    5. 12.5 Glossary
  13. 13メカニカル、パッケージ、および注文情報

8.3.1 LMT87 Transfer Function

The output voltage of the LMT87, across the complete operating temperature range, is shown in Table 3. This table is the reference from which the LMT87 accuracy specifications (listed in the Accuracy Characteristics section) are determined. This table can be used, for example, in a host processor look-up table. A file containing this data is available for download at the LMT87 product folder under Tools and Software Models.

Table 3. LMT87 Transfer Table

TEMP
(°C)		VOUT
(mV)		TEMP
(°C)		VOUT
(mV)		TEMP
(°C)		VOUT
(mV)		TEMP
(°C)		VOUT
(mV)		TEMP
(°C)		VOUT
(mV)
–50 3277 –10 2767 30 2231 70 1679 110 1115
–49 3266 –9 2754 31 2217 71 1665 111 1101
–48 3254 –8 2740 32 2204 72 1651 112 1087
–47 3243 –7 2727 33 2190 73 1637 113 1073
–46 3232 –6 2714 34 2176 74 1623 114 1058
–45 3221 –5 2700 35 2163 75 1609 115 1044
–44 3210 –4 2687 36 2149 76 1595 116 1030
–43 3199 –3 2674 37 2136 77 1581 117 1015
–42 3186 –2 2660 38 2122 78 1567 118 1001
–41 3173 –1 2647 39 2108 79 1553 119 987
–40 3160 0 2633 40 2095 80 1539 120 973
–39 3147 1 2620 41 2081 81 1525 121 958
–38 3134 2 2607 42 2067 82 1511 122 944
–37 3121 3 2593 43 2054 83 1497 123 929
–36 3108 4 2580 44 2040 84 1483 124 915
–35 3095 5 2567 45 2026 85 1469 125 901
–34 3082 6 2553 46 2012 86 1455 126 886
–33 3069 7 2540 47 1999 87 1441 127 872
–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 is very linear, the response does have a slight umbrella parabolic shape. This shape is very accurately reflected in Table 3. The transfer table can be calculated by using the parabolic equation (Equation 1).

Equation 1. LMT87 ParaEq_G11_SNIS170.gif

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:

Equation 2. LMT87 ParEqSol_SNIS170.gif

For an even less accurate linear transfer function approximation, a line can easily be calculated over the desired temperature range from Table 3 using the two-point equation (Equation 3):

Equation 3. LMT87 equation_1_nis170.gif

where

  • V is in mV,
  • T is in °C,
  • T1 and V1 are the coordinates of the lowest temperature,
  • and T2 and V2 are the coordinates of the highest temperature.

For example, if the user wanted to resolve this equation, over a temperature range of 20°C to 50°C, they would proceed as follows:

Equation 4. LMT87 equation_2_nis170.gif
Equation 5. LMT87 equation_3_nis170.gif
Equation 6. LMT87 equation_4_nis170.gif

Using this method of linear approximation, the transfer function can be approximated for one or more temperature ranges of interest.