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LT1460 Datasheet(PDF) 19 Page - Linear Technology |
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LT1460 Datasheet(HTML) 19 Page - Linear Technology |
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19 / 24 page  LT1460 19 1460f 1 2 3 4 1460 F15 LONG DIMENSION 2 1 0 0 40 30 20 FLEXURE NUMBER 10 1460 F16a –1 FLEXURE NUMBER 1460 F16b LONG DIMENSION 2 1 0 0 40 30 20 10 –1 APPLICATIO S I FOR ATIO deform the board a fixed amount as shown in Figure 15. The flexure #1 represents no displacement, flexure #2 is concave movement, flexure #3 is relaxation to no displace- ment and finally, flexure #4 is a convex movement. This motion is repeated for a number of cycles and the relative output deviation is noted. The result shown in Figure 16a is for two LT1460S8-2.5s mounted vertically and Figure 16b is for two LT1460S8-2.5s mounted horizontally. The parts oriented in Figure 16a impart less stress into the package because stress is absorbed in the leads. Figures 16a and 16b show the deviation to be between 125µV and Figure 15. Flexure Numbers Figure 16b. Two Typical LT1460S8-2.5s, Horizontal Orientation Without Slots Figure 16a. Two Typical LT1460S8-2.5s, Vertical Orientation Without Slots 250µV 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 16a and 16b are shown in Figures 17a and 17b. In this example the slots can improve the output shift from about 100ppm to nearly zero. SLOT 2 1 0 0 40 30 20 FLEXURE NUMBER 10 1460 F17a –1 SLOT 2 1 0 0 40 30 20 FLEXURE NUMBER 10 1460 F17b –1 Figure 17a. Same Two LT1460S8-2.5s in Figure 16a, but with Slots Figure 17b. Same Two LT1460S8-2.5s in Figure 16b, but with Slots |
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