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AD588 Fiches technique(PDF) 9 Page - Analog Devices

No de pièce AD588
Description  Multiple Output, High Precision, Dual-Tracking Reference
Download  20 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD588 Fiches technique(HTML) 9 Page - Analog Devices

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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


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