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AD588 Fiches technique(PDF) 9 Page - Analog Devices |
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AD588 Fiches technique(HTML) 9 Page - Analog Devices |
9 / 20 page AD588 Rev. L | Page 9 of 20 NOISE PERFORMANCE AND REDUCTION The noise generated by the AD588 is typically less than 6 μV p-p over the 0.1 Hz to 10 Hz band. Noise in a 1 MHz bandwidth is approximately 600 μV p-p. The dominant source of this noise is the buried Zener, which contributes approximately 100 nV/√Hz. In comparison, the op amp’s contribution is negligible. Figure 7 shows the 0.1 Hz to 10 Hz noise of a typical AD588. If further noise reduction is desired, an optional capacitor, CN, can be added between the NOISE REDUCTION pin and ground, as shown in Figure 5. This forms a low-pass filter with the 4 kΩ RB on the output of the Zener cell. A 1 μF capacitor has a 3 dB point at 40 Hz and reduces the high frequency noise (to 1 MHz) to about 200 μV p-p. Figure 8 shows the 1 MHz noise of a typical AD588 both with and without a 1 μF capacitor. Note that a second capacitor is needed in order to implement the noise reduction feature when using the AD588 in the −10 V mode (Figure 6). The noise reduction capacitor is limited to 0.1 μF maximum in this mode. 1µV Figure 7. 0.1 Hz to 10 Hz Noise (0.1 Hz to 10 Hz BPF with Gain of 1000 Applied) CN = 1mF NO CN Figure 8. Effect of 1 μF Noise Reduction Capacitor on Broadband Noise |
Numéro de pièce similaire - AD588_15 |
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Description similaire - AD588_15 |
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