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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD628ARM датащи(PDF) 18 Page - Analog Devices |
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AD628ARM датащи(HTML) 18 Page - Analog Devices |
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18 / 20 page  AD628 Rev. C | Page 18 of 20 FILTER CAPACITOR VALUES A capacitor may be connected to Pin 4 (CFILT) to implement a low-pass filter. The capacitor value is () μF 15.9/ tf C = where ft is the desired 3 dB filter frequency. Table 7 shows several frequencies and their closest standard capacitor values. Table 7. Capacitor Values for Various Filter Frequencies Frequency (Hz) Capacitor Value (µF) 10 1.5 50 0.33 60 0.27 100 0.15 400 0.039 1 k 0.015 5 k 0.0033 10 k 0.0015 KELVIN CONNECTION In certain applications, it may be desirable to connect the inverting input of an amplifier to a remote reference point. This eliminates errors resulting in circuit losses in interconnecting wiring. The AD628 is particularly suited for this type of connection. In Figure 35, a 10 kΩ resistor is added in the feedback to match the source impedance of A2, which is described in more detail in the Gain Adjustment section. +IN –IN A2 +VS 5V –IN +IN VREF OUT CIRCUIT LOSS LOAD +IN –IN G = +0.1 A1 AD628 –VS 10k Ω 10k Ω 10k Ω 100k Ω 100k Ω VS/2 CFILT RG 10k Ω Figure 35. Kelvin Connection |
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