Datasheet AD588 (Analog Devices) - 9
| Manufacturer | Analog Devices |
| Description | Multiple Output, High Precision, Dual Tracking Reference |
| Pages / Page | 20 / 9 — Data Sheet. AD588. NOISE PERFORMANCE AND REDUCTION. 1µV. CN = 1mF. NO CN |
| Revision | M |
| File Format / Size | PDF / 550 Kb |
| Document Language | English |
Data Sheet. AD588. NOISE PERFORMANCE AND REDUCTION. 1µV. CN = 1mF. NO CN
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Data Sheet AD588 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
1µV
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. 007 This forms a low-pass filter with the 4 kΩ R 00531- B on the output of the Zener cell. A 1 µF capacitor has a 3 dB point at 40 Hz and Figure 7. 0.1 Hz to 10 Hz Noise (0.1 Hz to 10 Hz BPF with Gain of 1000 Applied) 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
CN = 1mF
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.
NO CN
008 00531- Figure 8. Effect of 1 µF Noise Reduction Capacitor on Broadband Noise Rev. M | Page 9 of 20 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS THEORY OF OPERATION APPLICATIONS INFORMATION CALIBRATION NOISE PERFORMANCE AND REDUCTION TURN-ON TIME TEMPERATURE PERFORMANCE KELVIN CONNECTIONS DYNAMIC PERFORMANCE USING THE AD588 WITH CONVERTERS AD7535 14-BIT DIGITAL-TO-ANALOG CONVERTER AD569 16-BIT DIGITAL-TO-ANALOG CONVERTER SUBSTITUTING FOR INTERNAL REFERENCES AD574A 12-BIT ANALOG-TO-DIGITAL CONVERTER RESISTANCE TEMPERATURE DETECTOR (RTD) EXCITATION BOOSTED PRECISION CURRENT SOURCE BRIDGE DRIVER CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE
Data Sheet AD588 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
1µV
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. 007 This forms a low-pass filter with the 4 kΩ R 00531- B on the output of the Zener cell. A 1 µF capacitor has a 3 dB point at 40 Hz and Figure 7. 0.1 Hz to 10 Hz Noise (0.1 Hz to 10 Hz BPF with Gain of 1000 Applied) 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
CN = 1mF
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.
NO CN
008 00531- Figure 8. Effect of 1 µF Noise Reduction Capacitor on Broadband Noise Rev. M | Page 9 of 20 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS THEORY OF OPERATION APPLICATIONS INFORMATION CALIBRATION NOISE PERFORMANCE AND REDUCTION TURN-ON TIME TEMPERATURE PERFORMANCE KELVIN CONNECTIONS DYNAMIC PERFORMANCE USING THE AD588 WITH CONVERTERS AD7535 14-BIT DIGITAL-TO-ANALOG CONVERTER AD569 16-BIT DIGITAL-TO-ANALOG CONVERTER SUBSTITUTING FOR INTERNAL REFERENCES AD574A 12-BIT ANALOG-TO-DIGITAL CONVERTER RESISTANCE TEMPERATURE DETECTOR (RTD) EXCITATION BOOSTED PRECISION CURRENT SOURCE BRIDGE DRIVER CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE
