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LTC2410IGN Datasheet(PDF) 21 Page - Linear Technology |
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LTC2410IGN Datasheet(HTML) 21 Page - Linear Technology |
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21 / 44 page  LTC2410 21 APPLICATIO S I FOR ATIO The effect of this input dynamic current can be analyzed using the test circuit of Figure 16. The CPAR capacitor includes the LTC2410 pin capacitance (5pF typical) plus the capacitance of the test fixture used to obtain the results shown in Figures 17 and 18. A careful implementation can bring the total input capacitance (CIN + CPAR) closer to 5pF thus achieving better performance than the one predicted by Figures 17 and 18. For simplicity two distinct situations can be considered. Figure 15. LTC2410 Equivalent Analog Input Circuit Figure 16. An RC Network at IN+ and IN– Figure 18. –FS Error vs RSOURCE at IN + or IN– (Small CIN) Figure 17. +FS Error vs RSOURCE at IN + or IN– (Small CIN) IIN VV V R IIN VV V R IREF VV V R V VR IREF 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 R M INTERNAL OSCILLATOR Hz Notch F LOW R M INTERNAL OSCILLATOR Hz Notch F HIGH R f EXTERNAL OSCILLATOR REF REFCM IN INCM EQ O EQ O EQ EOSC =− = + =− = − == () == () =• () +− +− +− +− 2 2 361 60 432 50 0 555 1012 Ω Ω 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– 2410 F15 ILEAK VCC ILEAK ILEAK SWITCHING FREQUENCY fSW = 76800Hz INTERNAL OSCILLATOR (FO = LOW OR HIGH) fSW = 0.5 • fEOSC EXTERNAL OSCILLATOR VREF– RSW (TYP) 20k CIN 2410 F16 VINCM + 0.5VIN RSOURCE IN+ LTC2410 CPAR ≅20pF CIN VINCM – 0.5VIN RSOURCE IN – CPAR ≅20pF RSOURCE (Ω) 1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 2410 F17 50 40 30 20 10 0 VCC = 5V REF+ = 5V REF – = GND IN+ = 5V IN– = 2.5V FO = GND TA = 25°C CIN = 0.01µF CIN = 0.001µF CIN = 100pF CIN = 0pF RSOURCE (Ω) 1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 2410 F18 0 –10 –20 –30 –40 –50 VCC = 5V REF+ = 5V REF – = GND IN+ = GND IN– = 2.5V FO = GND TA = 25°C CIN = 0.01µF CIN = 0.001µF CIN = 100pF CIN = 0pF |
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