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LTC2430 数据表(PDF) 37 Page - Linear Technology |
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LTC2430 数据表(HTML) 37 Page - Linear Technology |
37 / 40 page LTC2430/LTC2431 37 24301f temperature) will produce a worst-case error of –180ppm at a noise gain of 3, such as would be encountered in an inverting gain of 2, to produce –10V from a 5V reference. The error associated with the 10V excitation would be –80ppm. Hence, overall reference error could be as high as 130ppm, the average of the two. Figure 45 shows a similar scheme to provide excitation using resistor arrays to produce precise gain. The circuit is configured to provide 10V and –5V excitation to the bridge, producing a common mode voltage at the input to the LTC2430/LTC2431 of 2.5V, maximizing the AC input range for applications where induced 60Hz could reach amplitudes up to 2VRMS. The circuits in Figures 43 and 45 could be used where multiple bridge circuits are involved and bridge output can be multiplexed onto a single LTC2430/LTC2431, via an inexpensive multiplexer such as the 74HC4052. Figure 44 shows the use of an LTC2430/LTC2431 with a differential multiplexer. This is an inexpensive multiplexer that will contribute some error due to leakage if used directly with the output from the bridge, or if resistors are inserted as a protection mechanism from overvoltage. Although the bridge output may be within the input range of the A/D and multiplexer in normal operation, some thought should be given to fault conditions that could result in full excitation voltage at the inputs to the multi- plexer or ADC. The use of amplification prior to the multiplexer will largely eliminate errors associated with channel leakage developing error voltages in the source impedance. Complete 20-Bit Data Acquistion System in 0.1 Inch2 The LTC2430/LTC2431 provide 20-bit accuracy while consuming a maximum of 300 µA. The MS package of the LTC2431 makes it especially attractive in applications where very limited space is available. A complete 20-bit data acquisition system in 0.1 inch2 is shown in Figure 46 where the LTC2431 is powered by the LT1790 reference family in an S6 package. A supply voltage from 0.25V above the LT1790 output level to 20V enables the LT1790 to source up to 1mA and ensure the solid performance of the LT2431. The 3V, 3.3V, 4.096V and 5V versions of the LT1790 can power the LTC2430/LTC2431 directly. Lower voltage ver- sions will require a separate VCC supply of 2.7V to 5.5V for the LTC2430/LTC2431. 2431 F44 REF+ REF– IN+ IN– A0 A1 VCC GND 13 3 6 12 47 µF 14 1 5 10 16 5V 15 11 2 TO OTHER DEVICES 4 9 8 5V + 74HC4052 LTC2430/ LTC2431 Figure 44. Use a Differential Mulitplexer to Expand Channel Capability APPLICATIO S I FOR ATIO |
类似零件编号 - LTC2430_15 |
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类似说明 - LTC2430_15 |
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