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AD581SH883B Scheda tecnica(PDF) 6 Page - Analog Devices |
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AD581SH883B Scheda tecnica(HTML) 6 Page - Analog Devices |
6 / 12 page AD581 Rev. C | Page 6 of 12 APPLYING THE AD581 The AD581 is easy to use in virtually all precision reference applications. The three pins are simply: primary supply, ground, and output, with the case grounded. No external components are required even for high precision applications; the degree of desired absolute accuracy is achieved simply by selecting the required device grade. The AD581 requires less than 1 mA quies- cent current from an operating supply range of 13 V to 30 V. +VS VOUT GND AD581 10V 13V TO 30V Figure 2. Pin Configuration (Bottom View) An external fine trim may be desired to set the output level to exactly 10.000 V within less than a millivolt (calibrated to a main system reference). System calibration may also require a reference slightly different from 10.00 V. In either case, the optional trim circuit shown in Figure 3 can offset the output by up to ±30 mV (with the 22 Ω resistor), if needed, with minimal effect on other device characteristics. +VS VOUT 6.8k Ω 10k Ω 4.3k Ω GND AD581 +10V R +15V –15V R TRIM RANGE MAX Δ TCR 22 Ω ±30mV 3.5ppm/°C 12 Ω ±10mV 2.0ppm/°C 3.9 Ω ±5mV 0.6ppm/°C Figure 3. Optional Fine Trim Configuration V+ 10V V– Q12 Q14 Q11 Q20 C52 Q6 Q16 Q13 C50 C51 Q10 R40 R41 Q7 Q8 Q15 R42 R34 R37 R35 R36 R30 R31 R39 Q4 Q3 Q5 Q1 Q2 R32 R33 Figure 4. Simplified Schematic VOLTAGE VARIATION vs. TEMPERATURE Some confusion exists in the area of defining and specifying reference voltage error over temperature. Historically, references have been characterized using a maximum deviation per degree Celsius; that is, 10 ppm/°C. However, because of nonlinearities in temperature characteristics, which originated in standard Zener references (such as S-type characteristics) manufacturers opt for the maximum limit error band approach to specify devices. This technique involves measurement of the output at three, five, or more different temperatures to guarantee that the output voltage falls within the given error band. The temperature charac- teristic of the AD581 consistently follows the S-curve shown in Figure 5. Three-point measurement of each device guarantees the error band over the specified temperature range. 10.005 9.995 TEMPERATURE (°C) 10.000 –50 –55 –40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90 100 110 120 125 Figure 5. Typical Temperature Characteristic |
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