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LT1460 Datasheet(PDF) 18 Page - Linear Technology |
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LT1460 Datasheet(HTML) 18 Page - Linear Technology |
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18 / 24 page  LT1460 18 1460f APPLICATIO S I FOR ATIO Input Capacitance It is recommended that a 0.1µF or larger capacitor be added to the input pin of the LT1460. This can help with stability when large load currents are demanded. Output Accuracy Like all references, either series or shunt, the error budget of the LT1460-2.5 is made up of primarily three components: initial accuracy, temperature coefficient and load regulation. Line regulation is neglected because it typically contrib- utes only 30ppm/V, or 75µV for a 1V input change. The LT1460-2.5 typically shifts less than 0.01% when soldered into a PCB, so this is also neglected (see PC Board Layout section). The output errors are calculated as follows for a 100µA load and 0°C to 70°C temperature range: LT1460AC Initial accuracy = 0.075% For IO = 100µA, and using the LT1460-2.5 for calculation, ∆V ppm mA mA V V OUT = ⎛ ⎝⎜ ⎞ ⎠⎟()( )= 3500 01 25 875 .. µ which is 0.035%. For temperature 0°C to 70°C the maximum ΔT = 70°C, ∆V ppm C CV mV OUT = ° ⎛ ⎝⎜ ⎞ ⎠⎟ ° ()( )= 10 70 25 175 .. which is 0.07%. Total worst-case output error is: 0.075% + 0.035% + 0.070% = 0.180%. Table 1 gives worst-case accuracy for the LT1460AC, CC, DC, FC, GC from 0°C to 70°C and the LT1460BI, EI, GI from –40°C to 85°C. Note that the LT1460-5 and LT1460-10 give identical ac- curacy as a fraction of their respective output voltages. PC Board Layout In 13- to 16-bit systems where initial accuracy and tem- perature coefficient calibrations have been done, the me- chanical and thermal stress on a PC board (in a cardcage for instance) can shift the output voltage and mask the true temperature coefficient of a reference. In addition, the mechanical stress of being soldered into a PC board can cause the output voltage to shift from its ideal value. Surface mount voltage references (MS8 and S8) are the most susceptible to PC board stress because of the small amount of plastic used to hold the lead frame. A simple way to improve the stress-related shifts is to mount the reference near the short edge of the PC board, or in a corner. The board edge acts as a stress boundary, or a region where the flexure of the board is minimum. The package should always be mounted so that the leads absorb the stress and not the package. The package is generally aligned with the leads parallel to the long side of the PC board as shown in Figure 16a. A qualitative technique to evaluate the effect of stress on voltage references is to solder the part into a PC board and Table 1. Worst-Case Output Accuracy Over Temperature IOUT LT1460AC LT1460BI LT1460CC LT1460DC LT1460EI LT1460FC LT1460GC LT1460GI LT1460HC LT1460JC LT1460KC 0 0.145% 0.225% 0.205% 0.240% 0.375% 0.325% 0.425% 0.562% 0.340% 0.540% 0.850% 100µA 0.180% 0.260% 0.240% 0.275% 0.410% 0.360% 0.460% 0.597% 0.380% 0.580% 0.890% 10mA 0.325% 0.405% 0.385% 0.420% 0.555% 0.505% 0.605% 0.742% 0.640% 0.840% 1.15% 20mA 0.425% N/A 0.485% 0.520% N/A 0.605% 0.705% N/A 0.540% 0.740% 1.05% |
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Similar Description - LT1460 |
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