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ADR1581BRTZ-R2 Datasheet(PDF) 8 Page - Analog Devices |
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ADR1581BRTZ-R2 Datasheet(HTML) 8 Page - Analog Devices |
8 / 12 page ADR1581 Rev. 0 | Page 8 of 12 40µV/DIV 21µV rms 20µV/DIV 10µV/DIV 10ms/DIV 6.5µV rms, t = 0.2ms (a) (b) (c) 2.90µV rms, t = 960ms OUTPUT IMPEDANCE VS. FREQUENCY Understanding the effect of the reverse dynamic output impedance in a practical application is important to successfully applying the ADR1581. A voltage divider is formed by the ADR1581 output impedance and the external source impedance. When an external source resistor of about 30 kΩ (IR = 100 μA) is used, 1% of the noise from a 100 kHz switching power supply is developed at the output of the ADR1581. Figure 15 shows how a 1 μF load capacitor connected directly across the ADR1581 reduces the effect of power supply noise to less than 0.01%. 1k 10 0.1 1 100 FREQUENCY (Hz) CL = 0 CL = 1µF ΔIR = 0.1IR IR = 100µA IR = 1mA 10 100 1k 10k 100k 1M Figure 17. Total RMS Noise TURN-ON TIME Many low power instrument manufacturers are becoming increasingly concerned with the turn-on characteristics of the components in their systems. Fast turn-on components 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 18 displays the turn-on characteristics of the ADR1581. 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 wave- form after power-up. Figure 15. Output Impedance vs. Frequency NOISE PERFORMANCE AND REDUCTION The noise generated by the ADR1581 is typically less than 5 μV p-p over the 0.1 Hz to 10 Hz band. Figure 20 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. Figure 16 shows the 0.1 Hz to 10 Hz noise of a typical ADR1581. Noise in a 10 Hz to 10 kHz bandwidth is approximately 20 μV rms (see Figure 17a). If further noise reduction is desired, a one-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 250mV/DIV 5µs/DIV CL = 200pF VIN 0V 2.4V Figure 17b). 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 17c). 1µV/DIV TIME (1s/DIV) 4.48µV p-p Figure 18. Turn-On Response Time + – RS = 11.5kΩ RL CL VOUT VR VIN Figure 19. Turn-On, Settling, and Transient Test Circuit Figure 16. 0.1 Hz to 10 Hz Voltage Noise |
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