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X60003C-41 Datasheet(PDF) 8 Page - Intersil Corporation |
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X60003C-41 Datasheet(HTML) 8 Page - Intersil Corporation |
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8 / 11 page  8 FN8138.0 March 15, 2005 load capacitances above .001µF the noise reduction network shown in fig. 3 is recommended. This network reduces noise sig-nificantly over the full bandwidth. As shown in fig. 2, noise is reduced to less than 40µVp-p from 1Hz to 1MHz using this network with a .01µF capacitor and a 2k Ω resistor in series with a 10µF capacitor. Figure 2. Figure 3. Turn-On Time The X60003x-41 device has ultra-low supply current and thus the time to bias up internal circuitry to final values will be longer than with higher power refer- ences. Normal turn-on time is typically 7ms. This is shown in the graph, Figure 4. Since devices can vary in supply current down to 300nA, turn-on time can last up to about 12ms. Care should be taken in system design to include this delay before measurements or conversions are started. Figure 4. Temperature Coefficient The limits stated for temperature coefficient (tempco) are governed by the method of measurement. The overwhelming standard for specifying the temperature drift of a reference is to measure the reference voltage at two temperatures, take the total variation, (VHIGH - VLOW), and divide by the temperature extremes of measurement (THIGH -TLOW). The result is divided by the nominal reference voltage (at T = 25°C) and multiplied by 106 to yield ppm/°C. This is the “Box” method for determining temperature coefficient. CL = 0 CL = .001µF CL = .1µF CL = .01µF & 10µF + 2k Ω 400 350 300 250 200 150 100 50 0 1 10 100 1000 10000 100000 X60003x-41 NOISE REDUCTION VIN = 5.0V VIN VO GND X60003x-41 .01µF 10µF 2k Ω .1µF 10µF X60003 TURN-ON TIME (25 °C) TIME (mSec) 0 1 2 3 4 5 6 7 -1 13579 11 IIN = 590nA VIN IIN = 450nA IIN = 340nA X6003B-41, X6003C-41, X6003D-41 |
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