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X60008C-41 Datasheet(PDF) 11 Page - Intersil Corporation |
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X60008C-41 Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 14 page 11 FN8142.0 March 14, 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 X60008 devices have ultra-low supply current and thus the time to bias up internal circuitry to final values will be longer than with higher power references. Nor- mal turn-on time is typically 7ms. This is shown in the graph, Figure 4. Since devices can vary in supply cur- rent 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 conver- sions 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 multi- plied 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 X60008-41 NOISE REDUCTION VIN = 5.0V VIN VO GND X60008-41 .01µF 10µF 2k Ω .1µF 10µF X60008 TURN-ON TIME (25 °C) (3 Representative Units) TIME (mSec) IIN = 700nA IIN = 520nA IIN = 360nA VIN 0 1 2 3 4 5 6 -1 1 3 579 11 X60008B-41, X60008C-41, X60008D-41 |
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