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ISL21080CIH312Z-TK Datenblatt(PDF) 8 Page - Intersil Corporation |
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ISL21080CIH312Z-TK Datenblatt(HTML) 8 Page - Intersil Corporation |
8 / 10 page 8 FN6934.0 July 28, 2009 band increases due to instability of the very low power amplifier with a 0.1µF capacitance load. For load capacitances above 0.001µF, the noise reduction network shown in Figure 20 is recommended. This network reduces noise significantly over the full bandwidth. As shown in Figure 19, noise is reduced to less than 40µVP-P from 1Hz to 1MHz using this network with a 0.01µF capacitor and a 2k Ω resistor in series with a 10µF capacitor. Turn-On Time The ISL21080 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. Normal turn-on time is typically 7ms. This is shown in Figure 18. 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. 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 specifying temperature coefficient. CL = 0 CL = 0.001µF CL = 0.1µF CL = 0.01µF AND 10µF + 2k Ω 400 350 300 250 200 150 100 50 0 1 10 100 1k 10k 100k FIGURE 19. NOISE REDUCTION VIN = 3.0V VIN VO GND ISL21080 0.01µF 10µF 2k Ω 0.1µF 10µF FIGURE 20. NOISE REDUCTION NETWORK Typical Application Circuits FIGURE 21. PRECISION 2.5V 50mA REFERENCE VIN = 3.0V 2N2905 2.5V/50mA 0.001µF VIN VOUT GND ISL21080 R = 200 Ω ISL21080 |
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Ähnliche Beschreibung - ISL21080CIH312Z-TK |
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