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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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ISL60007BIB825 Fiches technique(PDF) 7 Page - Intersil Corporation |
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ISL60007BIB825 Fiches technique(HTML) 7 Page - Intersil Corporation |
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7 / 10 page  7 FN8087.3 April 21, 2006 Board Mounting Considerations For applications requiring the highest accuracy, board mounting location should be reviewed. Placing the device in areas subject to slight twisting can cause degradation of the accuracy of the reference voltage due to die stresses. It is normally best to place the device near the edge of a board, or the shortest side, as the axis of bending is most limited at that location. Obviously mounting the device on flexprint or extremely thin PC material will likewise cause loss of reference accuracy. Noise Performance and Reduction The output noise voltage in a 0.1Hz to 10Hz bandwidth is typically 30µVP-P. This is shown in the plot in the Typical Performance Curves. The noise measurement is made with a bandpass filter made of a 1 pole high-pass filter with a corner frequency at 0.1Hz and a 2-pole low-pass filter with a corner frequency at 12.6Hz to create a filter with a 9.9Hz bandwidth. Noise in the 10kHz to 1MHz bandwidth is approximately 400µVP-P with no capacitance on the output, as shown in Figure 16. These noise measurements are made with a 2 decade bandpass filter made of a 1 pole high- pass filter with a corner frequency at 1/10 of the center frequency and 1-pole low-pass filter with a corner frequency at 10 times the center frequency. Figure 16 also shows the noise in the 10kHz to 1MHz band can be reduced to about 50µVP-P using a 0.001µF capacitor on the output. Noise in the 1kHz to 100kHz band can be further reduced using a 0.1µF capacitor on the output, but noise in the 1Hz to 100Hz 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 17 is recommended. This network reduces noise significantly over the full bandwidth. As shown in Figure 16, 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 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 18. 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 16. 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 17. 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 18. TURN-ON TIME (+25°C) ISL60007 |
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