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AD1584 Scheda tecnica(PDF) 11 Page - Analog Devices |
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AD1584 Scheda tecnica(HTML) 11 Page - Analog Devices |
11 / 12 page AD1582/AD1583/AD1584/AD1585 –11– REV. D AC PERFORMANCE To apply the AD1582/AD1583/AD1584/AD1585 family of references, it is important to understand the effects of dynamic output impedance and power supply rejection. In Figure 8a, a voltage divider is formed by the AD1582’s output impedance and by the external source impedance. Figure 8b shows the effect of varying the load capacitor on the reference output. Power supply rejection ratio (PSRR) should be determined when characterizing the ac performance of a series voltage reference. Figure 9a shows a test circuit used to measure PSRR, and Figure 9b demonstrates the AD1582’s ability to attenuate line voltage ripple. 2 VOUT 10k 10k 2V 100 A 10k 2k VLOAD DC 5V 5 F 1 F DUT 1 Figure 8a. Output Impedance Test Circuit 100 1 0.1 10 FREQUENCY (Hz) 10 100 1k 10k 100k 1M 1 F CAP AD1585 AD1582 Figure 8b. Output Impedance vs. Frequency 5V 100mV 0.22 F DUT 0.22 F VOUT 10V 10k 10k 200mV 1 Figure 9a. Ripple Rejection Test Circuit FREQUENCY (Hz) 100 90 0 11M 10 100 1k 10k 100k 50 20 80 70 60 40 30 10 AD1582 AD1585 Figure 9b. Ripple Rejection vs. Frequency NOISE PERFORMANCE AND REDUCTION The noise generated by the AD1582 is typically less than 70 µV p-p over the 0.1 Hz to 10 Hz frequency band. Figure 10 shows the 0.1 Hz to 10 Hz noise of a typical AD1582. The noise measurement is made with a high gain band-pass filter. Noise in a 10 Hz to 10 kHz region is approximately 50 µV rms. Figure 11 shows the broadband noise of a typical AD1582. If further noise reduction is desired, a 1-pole low-pass filter may be added between the output pin and the ground. A time constant of 0.2 ms has a –3 dB point at roughly 800 Hz, and reduces the high frequency noise to about 16 µV rms. It should be noted, however, that while additional filtering on the output may improve the noise performance of the AD1582/AD1583/AD1584/AD1585 family, the added output impedance could degrade the ac performance of the references. 100 90 10 0% 10 V 1s Figure 10. 0.1 Hz to 10 Hz Voltage Noise 10 0% 100 90 10ms 100 V Figure 11. 10 Hz to 10 kHz Wideband Noise |
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