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ISL60007CIB825 Datasheet(PDF) 9 Page - Intersil Corporation |
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ISL60007CIB825 Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 12 page 9 FN8087.1 May 5, 2005 Turn-On Time The ISL60007 devices operate with ultra-low supply current and thus the time to bias up internal circuitry to final values will be longer than with references that require higher current. Normal turn-on time is typically 4ms. This is shown in Figure 30. Since devices can vary in supply current down to 250nA, turn-on time can last up to about 6ms. 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 = 0 400 350 300 250 200 150 100 50 0 1 10 100 1000 10000 100000 FIGURE 28. NOISE REDUCTION CL= 0.001µF CL = 0.01µF & 10µF + 2k Ω CL = 0.1µF VIN = 3.0V VIN VO GND ISL60007 0.01µF 10µF 2k Ω 0.1µF 10µF FIGURE 29. 0 0.5 1 1.5 2 2.5 3 3.5 0 2 4 6 8 10 12 TIME (ms) 400nA VIN 570nA 250nA FIGURE 30. TURN-ON TIME (+25°C) Typical Application Circuits FIGURE 31. PRECISION 2.5V, 50mA REFERENCE VIN = 5V 2N2905 2.5V/50mA 0.001µF VIN VOUT GND ISL60007 R = 200 Ω ISL60007 |
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