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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD628ARMZ датащи(PDF) 17 Page - Analog Devices |
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AD628ARMZ датащи(HTML) 17 Page - Analog Devices |
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17 / 20 page  AD628 Rev. F | Page 17 of 20 5 1 3 4 8 2 7 +Vs –Vs 6 –IN +IN VREF 100kΩ 10kΩ 100kΩ 10kΩ 10kΩ A1 A2 4 5 6 3 1 2 SCLK SDATA CS GND VDD VIN AD628 SERIAL DATA REF195 +12V VOUT VIN 2 3 4 6 CFILT RG 10μF 0.1μF 10μF 0.1μF 10μF 0.1μF 10μF 0.1μF AD7940 +/–10V 15nF 2 3 1 AD8606 1/2 49.9Ω 33nF +12V –12V 10kΩ 10kΩ AD628 REFERENCE VOLTAGE REXT2 10kΩ REXT1 15kΩ AD8606 2/2 5 6 7 4 8 Figure 32. Level Shifter CURRENT LOOP RECEIVER Analog data transmitted on a 4 to 20 mA current loop can be detected with the receiver shown in Figure 33. The AD628 is an ideal choice for such a function because the current loop is driven with a compliance voltage sufficient to stabilize the loop, and the resultant common-mode voltage often exceeds com- monly used supply voltages. Note that with large shunt values, a resistance of equal value must be inserted in series with the inverting input to compensate for an error at the noninverting input. MONITORING BATTERY VOLTAGES Figure 34 illustrates how the AD628 is used to monitor a battery charger. Voltages approximately eight times the power supply voltage can be applied to the input with no damage. The resistor divider action is well-suited for the measurement of many power supply applications, such as those found in battery chargers or similar equipment. 6 8 1 4 5 7 2 3 AD628 +15V +2.5V 9.53k Ω –15V 10k Ω 0V TO 5V TO ADC I = 4 TO 20mA 100k Ω 210k Ω 100k Ω 100k Ω 249 Ω VCM = 15V 10k Ω 10k Ω 249 Ω Figure 33. Level Shifter for 4 to 20 mA Current Loop |
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