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LT1460GIZ-5 Datasheet(PDF) 8 Page - Linear Technology |
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LT1460GIZ-5 Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page 8 LT1460-5 APPLICATIONS INFORMATION This motion is repeated for a number of cycles and the relative output deviation is noted. The result shown in Figure 7a is for two LT1460S8-5s mounted vertically and Figure 7b is for two LT1460S8-5s mounted horizontally. The parts oriented in Figure 7a impart less stress into the package because stress is absorbed in the leads. Figures 7a and 7b show the deviation to be between 250 µV and 500 µV and implies a 50ppm and 100ppm change respec- tively. This corresponds to a 13- to 14-bit system and is not a problem for most 10- to 12-bit systems unless the system has a calibration. In this case, as with temperature hysteresis, this low level can be important and even more careful techniques are required. The most effective technique to improve PC board stress is to cut slots in the board around the reference to serve as a strain relief. These slots can be cut on three sides of the reference and the leads can exit on the fourth side. This “tongue” of PC board material can be oriented in the long direction of the board to further reduce stress transferred to the reference. The results of slotting the PC boards of Figures 7a and 7b are shown in Figures 8a and 8b. In this example the slots can improve the output shift from about 100ppm to nearly zero. LONG DIMENSION 4 2 0 0 40 30 20 FLEXURE NUMBER 10 1460-5 F07a –2 FLEXURE NUMBER 1460-5 F07b LONG DIMENSION 4 2 0 0 40 30 20 10 –2 Figure 7b. Two Typical LT1460S8-5s, Horizontal Orientation Without Slots Figure 7a. Two Typical LT1460S8-5s, Vertical Orientation Without Slots SLOT 4 2 0 0 40 30 20 FLEXURE NUMBER 10 1460-5 F08a –2 SLOT 4 2 0 0 40 30 20 FLEXURE NUMBER 10 1460-5 F08b –2 Figure 8a. Same Two LT1460S8-5s in Figure 7a, but With Slots Figure 8b. Same Two LT1460S8-5s in Figure 7b, but With Slots Figure 6. Flexure Numbers 1 2 3 4 1460-5 F06 |
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