link to page 10 link to page 10 link to page 10 link to page 10 link to page 10 link to page 10 AD588Data SheetTURN-ON TIME Output turn-on time is modified when an external noise Upon application of power (cold start), the time required for reduction capacitor is used. When present, this capacitor the output voltage to reach its final value within a specified presents an additional load to the internal Zener diode current error band is the turn-on settling time. Two components source, resulting in a somewhat longer turn-on time. In the case normally associated with this are the time for active circuits to of a 1 µF capacitor, the initial turn-on time is approximately settle and the time for thermal gradients on the chip to stabilize. 60 ms (see Figure 11). Figure 9 and Figure 10 show the turn-on characteristics of the Note that if the noise reduction feature is used in the ±5 V AD588. The settling is about 600 µs. Note the absence of any configuration, a 39 kΩ resistor between Pin 6 and Pin 2 is thermal tails when the horizontal scale is expanded to 2 ms/cm required for proper startup. in Figure 10. +VS+VS–VSVOUTVOUT 1 1 0 00531- 009 Figure 11. Turn-On with CN = 1 µF 00531- Figure 9. Electrical Turn-On TEMPERATURE PERFORMANCE The AD588 is designed for precision reference applications where temperature performance is critical. Extensive temperature testing +VS ensures that the device’s high level of performance is maintained over the operating temperature range. Figure 12 shows typical output temperature drift for the AD588BQ and illustrates the test methodology. The box in Figure 12 is VOUT bounded on the sides by the operating temperature extremes and on top and bottom by the maximum and minimum output voltages measured over the operating temperature range. The slope of the diagonal drawn from the lower left corner of the 010 box determines the performance grade of the device. 00531- Figure 10. Extended Time Scale Turn-On VMAX – VMINSLOPE = T.C. = (TMAX – TMIN) × 10 × 1–410.0013V – 10.00025V(85°C – –25°C) × 10 × 10–410.002= 0.95ppm/°C) s oltVVMAXT ( 10.001U TPOUVMIN10.000–35–15525456585 012 TEMPERATURE (°C)VVMINMAX 00531- Figure 12. Typical AD588BQ Temperature Drift Rev. M | Page 10 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
