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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC2420CS8 датащи(PDF) 34 Page - Linear Technology |
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LTC2420CS8 датащи(HTML) 34 Page - Linear Technology |
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34 / 36 page  34 LTC2420 TYPICAL APPLICATIO S U1-A U1-B U1-C U1-F U1-E TO LTC2420 FO PIN U1-D 12 5pF 5k 1k 2N3904 10k 47k 1k 47k 10pF 100smps, FO = 2.048MHz 30smps, FO = 614.4kHz U1: 74HC14 OR EQUIVALENT 270pF 34 5 6 12 13 HALT 11 10 9 8 2420 F40 Figure 40. 2.048MHz Oscillator for 100sps Output Rate 2.048MHz Oscillator for 100sps Output Ratio The oscillator circuit shown in Figure 40 can be used to drive the FO pin, boosting the conversion rate of the LTC2420 for applications that do not require a notch at 50Hz or 60Hz. This oscillator is not sensitive to hysteresis voltage of a Schmitt trigger device as are simpler relaxation oscillators using the 74HC14 or similar de- vices. The circuit can be tuned over a 3:1 range with only one resistor and can be gated. The use of transmission gates could be used to shift the frequency in order to provide setable conversion rates. |
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