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LTC2480CDD Datasheet(PDF) 36 Page - Linear Technology |
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LTC2480CDD Datasheet(HTML) 36 Page - Linear Technology |
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36 / 40 page ![]() 36 LTC2480 2480f APPLICATIO S I FOR ATIO Figure 37. Measured Input Normal Mode Rejection vs Input Frequency with Input Perturbation of 150% Full Scale (60Hz Notch) INPUT FREQUENCY (Hz) 0 15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 2480 F37 0 –20 –40 –60 –80 –100 –120 VCC = 5V VREF = 5V VINCM = 2.5V TA = 25°C VIN(P-P) = 5V VIN(P-P) = 7.5V (150% OF FULL SCALE) Figure 38. Measured Input Normal Mode Rejection vs Input Frequency with Input Perturbation of 150% Full Scale (50Hz Notch) INPUT FREQUENCY (Hz) 0 2480 F38 0 –20 –40 –60 –80 –100 –120 VCC = 5V VREF = 5V VIN(CM) = 2.5V TA = 25°C VIN(P-P) = 5V VIN(P-P) = 7.5V (150% OF FULL SCALE) 12.5 25 37.5 50 62.5 75 87.5 100 112.5 125 137.5 150 162.5 175 187.5 200 Figure 39. Input Normal Mode Rejection 2x Speed Mode Figure 40. Input Normal Mode Rejection 2x Speed Mode Figure 41. Input Normal Mode Rejection vs Input Frequency, 2x Speed Mode and 50Hz/60Hz Mode Figure 42. Input Normal Mode Rejection 2x Speed Mode INPUT SIGNAL FREQUENCY (fN) 2480 F39 0 –20 –40 –60 –80 –100 –120 0 fN 2fN 3fN 4fN 5fN 6fN 7fN 8fN INPUT SIGNAL FREQUENCY (fN) 2480 F48 0 –20 –40 –60 –80 –100 –120 250 248 252 254 256 258 260 262 264 INPUT FREQUENCY (Hz) 0 50 100 125 225 2480 F41 25 75 150 175 200 0 –20 –40 –60 –80 –100 –120 VCC = 5V VREF = 5V VINCM = 2.5V VIN(P-P) = 5V FO = GND TA = 25°C MEASURED DATA CALCULATED DATA DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz) 48 –70 –80 –90 –100 –110 –120 –130 –140 54 58 2480 F42 50 52 56 60 62 NO AVERAGE WITH RUNNING AVERAGE mode. Typical measured values of the normal mode rejection of the LTC2480 operating with the internal oscil- lator and 2x speed mode is shown in Figure 41. When the LTC2480 is configured in 2x speed mode, by performing a running average, a SINC1 notch is combined with the SINC4 digital filter, yielding the normal mode |
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