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LTC2435-1IGN датащи(PDF) 26 Page - Linear Technology |
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LTC2435-1IGN датащи(HTML) 26 Page - Linear Technology |
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26 / 40 page ![]() LTC2435/LTC2435-1 26 24351fa APPLICATIO S I FOR ATIO Figure 14. LTC2435/LTC2435-1 Equivalent Analog Input Circuit Figure 15. An RC Network at IN+ and IN– Figure 17. –FS Error vs RSOURCE at IN + or IN– (Small CIN) Figure 16. +FS Error vs RSOURCE at IN+ or IN– (Small CIN) IIN VV V R IIN VV V R I REF VV V R V VR I REF VV V R V VR where AVG IN INCM REFCM EQ AVG IN INCM REFCM EQ AVG REF INCM REFCM EQ IN REF EQ AVG REF INCM REFCM EQ IN REF EQ + − + − () = + − • () = − + − • () = • − + • − • () = − • − + • + • 05 05 15 05 15 05 2 2 . . . . . . :: V REF REF V REF REF VIN IN V IN IN REF REFCM IN INCM REQ = 43.2MΩ INTERNAL OSCILLATOR 60Hz NOTCH (FO = LOW) LTC2435 REQ = 52MΩ INTERNAL OSCILLATOR 50Hz NOTCH (FO = HIGH) LTC2435 REQ = 48MΩ INTERNAL OSCILLATOR 50Hz/60Hz NOTCH (FO = LOW) LTC2435-1 REQ = (6.7 • 1012)/fEOSC EXTERNAL OSCILLATOR = − = + ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ = − = − ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ + − + − + − + − 2 2 VREF+ VIN+ VCC RSW (TYP) 20k ILEAK ILEAK VCC ILEAK ILEAK VCC RSW (TYP) 20k CEQ 18pF (TYP) RSW (TYP) 20k ILEAK IIN+ VIN– IIN– IREF+ IREF– 2435 F18 ILEAK VCC ILEAK ILEAK SWITCHING FREQUENCY fSW = 76800Hz INTERNAL OSCILLATOR (LTC2435) (FO = LOW OR HIGH) fSW = 69900Hz INTERNAL OSCILLATOR (LTC2435-1) (FO = LOW) fSW = 0.5 • fEOSC EXTERNAL OSCILLATOR VREF– RSW (TYP) 20k CIN 2435 F19 VINCM + 0.5VIN RSOURCE IN+ LTC2435/ LTC2435-1 CPAR ≅ 20pF CIN VINCM – 0.5VIN RSOURCE IN – CPAR ≅ 20pF RSOURCE (W) 1 10 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 10000 2435 F16 10 100 1000 100000 CIN = 0pF CIN = 100pF CIN = 0.01µF CIN = 0.001µF VCC = 5V VREF+ = 5V VREF– = GND VIN+ = 3.75V VIN– = 1.25V FO = GND TA = 25°C RSOURCE (W) 1 100 90 80 70 60 50 40 30 20 10 0 –10 10000 2435 F17 10 100 1000 100000 CIN = 0pF CIN = 0.01µF VCC = 5V VREF+ = 5V VREF– = GND VIN+ = 1.25V VIN– = 3.75V FO = GND TA = 25°C CIN = 100pF CIN = 0.001µF |
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