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AD1580BRTZ-R2 Folha de dados(PDF) 8 Page - Analog Devices |
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AD1580BRTZ-R2 Folha de dados(HTML) 8 Page - Analog Devices |
8 / 12 page AD1580 Rev. F | Page 8 of 12 NOISE PERFORMANCE AND REDUCTION The noise generated by the AD1580 is typically less than 5 µV p-p over the 0.1 Hz to 10 Hz band. Figure 17 shows the 0.1 Hz to 10 Hz noise of a typical AD1580. Noise in a 10 Hz to 10 kHz bandwidth is approximately 20 μV rms (see Figure 18a). If further noise reduction is desired, a 1-pole low-pass filter can be added between the output pin and ground. A time constant of 0.2 ms has a −3 dB point at about 800 Hz and reduces the high frequency noise to about 6.5 μV rms (see Figure 18b). A time constant of 960 ms has a −3 dB point at 165 Hz and reduces the high frequency noise to about 2.9 μV rms (see Figure 18c). 1s/DIV 1µV/DIV 4.5µV p-p Figure 17. 0.1 Hz to 10 Hz Voltage Noise 40µV/DIV 21µV rms 20µV/DIV 10µV/DIV 10ms/DIV 6.5µV rms, τ = 0.2ms (a) (b) (c) 2.90µV rms, τ = 960ms Figure 18. Total RMS Noise TURN-ON TIME Many low power instrument manufacturers are becoming increasingly concerned with the turn-on characteristics of components being used in their systems. Fast turn-on compo- nents often enable the end user to keep power off when not needed, and yet those components respond quickly when the power is turned on for operation. Figure 19 displays the turn-on characteristic of the AD1580. Upon application of power (cold start), the time required for the output voltage to reach its final value within a specified error is the turn-on settling time. Two components normally associated with this are time for active circuits to settle and time for thermal gradients on the chip to stabilize. This characteristic is generated from cold start operation and represents the true turn-on waveform after power-up. Figure 21 shows both the coarse and fine turn-on settling characteristics of the device; the total settling time to within 1.0 mV is about 6 µs, and there is no long thermal tail when the horizontal scale is expanded to 2 ms/div. 250mV/DIV 5µs/DIV CL = 200pF VIN 0V 2.4V Figure 19. Turn-On Response Time + – RS = 11.5kΩ RL CL VOUT VR VIN Figure 20. Turn-On, Settling, and Transient Test Circuit Output turn-on time is modified when an external noise reduction filter is used. When present, the time constant of the filter dominates overall settling. 0V VIN 2.4V OUTPUT ERROR 1mV/DIV, 2µs/DIV OUTPUT 0.5mV/DIV, 2ms/DIV Figure 21. Turn-On Settling |
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