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IVC102U Datasheet(PDF) 10 Page - Texas Instruments |
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IVC102U Datasheet(HTML) 10 Page - Texas Instruments |
10 / 15 page 10 ® IVC102 The input resistance seen at pin 2 includes an additional 1.5k Ω, the on-resistance of S 1. The total input resistance is the sum of the switch resistance and R IN, or 2.5kΩ in this example. Slew rate limit of the internal op amp is approximately 3V/ µs. For most applications, the slew rate of V OUT should be limited to 1V/ µs or less. The rate of change is propor- tional to IIN and inversely proportional to CINT: This can be important in some applications since the slew- induced input voltage is applied to the sensor or signal source. The slew-induced input voltage can be reduced by increasing CINT, which reduces the output slew rate. NONLINEARITY Careful nonlinearity measurements of the IVC102 yield typical results of approximately ±0.005% using the internal input capacitors (C INT = 100pF). Nonlinearity will be de- graded by using an external integrator capacitor with poor voltage coefficient. Performance with the internal capacitors is typically equal or better than the sensors it is used to measure. Actual application circuits with sensors such as a photodiode may have other sources of nonlinearity. 1/10T INT 1/T INT 10/T INT qq q –20dB/decade slope Frequency 0 –10 –20 –30 –40 –50 Corner at f = 0.32/T INT –3dB at f = 0.44/T INT FIGURE 5. Frequency Response of Integrating Converter. Slew Rate = I IN C INT |
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