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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD8546 датащи(PDF) 20 Page - Analog Devices |
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AD8546 датащи(HTML) 20 Page - Analog Devices |
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20 / 24 page  AD8546 Rev. 0 | Page 20 of 24 With a zero-scale input, a current of VREF/RNULL flows through R´. This creates a current flowing through the sense resistor, ISENSE, determined by the following equation: The AD8546 and ADR125 together consume only 160 μA quiescent current, making 3.34 mA current available to power additional signal conditioning circuitry or to power a bridge circuit. ISENSE, MIN = (VREF × R´)/(RNULL × RSENSE) RL 100Ω VDD 18V C2 10µF C3 0.1µF C1 390pF C4 0.1µF R4 3.3kΩ Q1 D1 4mA TO 20mA R3 1.2kΩ RNULL 1MΩ 1% VREF RSPAN 200kΩ 1% VIN 0V TO 5V R1 68kΩ 1% R2 2kΩ 1% NOTES 1. R1 + R2 = R´. 1/2 AD8546 C5 10µF RSENSE 100Ω 1% VOUT GND ADR125 VIN With a full-scale input voltage, current flowing through R´ is increased by the full-scale change in VIN/RSPAN. This creates an increase in the current flowing through the sense resistor. ISENSE, DELTA = (Full-Scale Change in VIN × R´)/(RSPAN × RSENSE) Therefore ISENSE, MAX = ISENSE, MIN + ISENSE, DELTA When R´ >> RSENSE, the current through the load resistor at the receiver side is almost equivalent to ISENSE. Figure 71 shows a design for a full-scale input voltage of 5 V. At 0 V of input, loop current is 3.5 mA, and at a full-scale input of 5 V, the loop current is 21 mA. This allows software calibration to fine-tune the current loop to the 4 mA to 20 mA range. Figure 71. 4 mA to 20 mA Current Loop Transmitter |
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