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LT1461CCS8-3 Datasheet(PDF) 11 Page - Linear Technology |
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LT1461CCS8-3 Datasheet(HTML) 11 Page - Linear Technology |
11 / 16 page 11 LT1461 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 5a and 5b are shown in Figures 6a and 6b. In this example the slots can improve the output shift from about 100ppm to nearly zero. relative output deviation is noted. The result shown in Figure 5a is for two LT1461S8-2.5s mounted vertically and Figure 5b is for two LT1461S8-2.5s mounted horizontally. The parts oriented in Figure 5a impart less stress into the package because stress is absorbed in the leads. Figures 5a and 5b show the deviation to be between 125 µV and 250 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. SLOT 2 1 0 0 40 30 20 FLEXURE NUMBER 10 1461 F06a –1 Figure 6a. Same Two LT1461S8-2.5s in Figure 5a, but with Slots SLOT 2 1 0 0 40 30 20 FLEXURE NUMBER 10 1461 F06b –1 Figure 6b. Same Two LT1461S8-2.5s in Figure 5b, but with Slots LONG DIMENSION 2 1 0 0 40 30 20 FLEXURE NUMBER 10 1461 F05a –1 Figure 5a. Two Typical LT1461S8-2.5s, Vertical Orientation Without Slots FLEXURE NUMBER 1461 F05b LONG DIMENSION 2 1 0 0 40 30 20 10 –1 Figure 5b. Two Typical LT1461S8-2.5s, Horizontal Orientation Without Slots APPLICATIO S I FOR ATIO |
Similar Part No. - LT1461CCS8-3 |
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Similar Description - LT1461CCS8-3 |
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