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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC2486IDE датащи(PDF) 29 Page - Linear Technology |
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LTC2486IDE датащи(HTML) 29 Page - Linear Technology |
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29 / 36 page  LTC2486 29 2486f APPLICATIONS INFORMATION and reference bypass capacitance) linearity and gain errors are introduced. For relatively small values of external reference capacitance (CREF < 1nF), the voltage on the sampling capacitor settles for reference impedances of many k Ω (if CREF = 100pF up to 10k Ω will not degrade the performance) (see Figures 13 and 14). In cases where large bypass capacitors are required on the reference inputs (CREF > 0.01µF) full-scale and linear- ity errors are proportional to the value of the reference resistance. Every ohm of reference resistance produces a full-scale error of approximately 0.5ppm (while operating in simultaneous 50Hz/60Hz mode) (see Figures 15 and 16). If the input common mode voltage is equal to the reference common mode voltage, a linearity error of approximately 0.67ppm per 100 Ω of reference resistance results (see Figure 17). In applications where the input and reference common mode voltages are different, the errors increase. Figure 13. +FS Error vs RSOURCE at VREF (Small CREF) Figure 14. –FS Error vs RSOURCE at VREF (Small CREF) RSOURCE (Ω) 0 50 70 90 10k 2486 F13 30 10 40 60 80 20 0 –10 10 100 1k 100k VCC = 5V VREF = 5V VIN + = 3.75V VIN – = 1.25V FO = GND TA = 25°C CREF = 0.01µF CREF = 0.001µF CREF = 100pF CREF = 0pF RSOURCE (Ω) 0 –30 –10 10 10k 2486 F14 –50 –70 –40 –20 0 –60 –80 –90 10 100 1k 100k VCC = 5V VREF = 5V VIN + = 1.25V VIN – = 3.75V FO = GND TA = 25°C CREF = 0.01µF CREF = 0.001µF CREF = 100pF CREF = 0pF Figure 15. +FS Error vs RSOURCE at VREF (Large CREF) Figure 16. –FS Error vs RSOURCE at VREF (Large CREF) RSOURCE (Ω) 0 300 400 500 800 2486 F15 200 100 0 200 400 600 1000 VCC = 5V VREF = 5V VIN + = 3.75V VIN – = 1.25V FO = GND TA = 25°C CREF = 1µF, 10µF CREF = 0.1µF CREF = 0.01µF RSOURCE (Ω) 0 –200 –100 0 800 2486 F16 –300 –400 –500 200 400 600 1000 VCC = 5V VREF = 5V VIN + = 1.25V VIN – = 3.75V FO = GND TA = 25°C CREF = 1µF, 10µF CREF = 0.1µF CREF = 0.01µF Figure 17. INL vs Differential Input Voltage and Reference Source Resistance for CREF > 1µF VIN/VREF – 0.5 2 6 10 0.3 2486 F17 –2 –6 0 4 8 –4 –8 –10 – 0.3 – 0.1 0.1 0.5 VCC = 5V VREF = 5V VIN(CM) = 2.5V TA = 25°C CREF = 10µF R = 1k R = 100 Ω R = 500 Ω |
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