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ADR1581BRTZ-REEL7 Datasheet(PDF) 7 Page - Analog Devices |
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ADR1581BRTZ-REEL7 Datasheet(HTML) 7 Page - Analog Devices |
7 / 12 page ADR1581 Rev. 0 | Page 7 of 12 1.2488 1.2498 1.2500 1.2502 1.2504 1.2506 1.2508 1.2494 1.2496 1.2490 1.2492 VMAX VMIN SLOPE = TC = (VMAX – VO) (+85°C – +25°C) × 1.250V × 10–6 SLOPE = TC = (VMIN – VO) (–40°C – +25°C) × 1.250V × 10–6 VO –55 –35 –15 5 25 45 65 85 105 125 TEMPERATURE (°C) 600 300 0 500 400 200 100 –55 –35 –15 5 25 45 65 85 105 125 TEMPERATURE (°C) Figure 12. Output Voltage vs. Temperature Figure 13. Residual Drift Error REVERSE VOLTAGE HYSTERESIS For example, the ADR1581BRT initial tolerance is ±1.5 mV; a ±50 ppm/°C temperature coefficient corresponds to an error band of ±4.1 mV (50 × 10−6 × 1.250 V × 65°C). Therefore, the unit is guaranteed to be 1.250 V ± 5.6 mV over the operating temperature range. A major requirement for high performance industrial equipment manufacturers is a consistent output voltage at nominal temperature following operation over the operating temperature range. This characteristic is generated by measuring the difference between the output voltage at +25°C after operating at +85°C and the output voltage at +25°C after operating at −40°C. Duplication of these results requires a combination of high accuracy and stable temperature control in a test system. Evaluation of the ADR1581 produces curves similar to those in Figure 14 displays the hysteresis associated with the ADR1581. This characteristic exists in all references and has been minimized in the ADR1581. Figure 4 and Figure 12. VOLTAGE OUTPUT NONLINEARITY VS. TEMPERATURE 0 15 20 25 30 35 40 5 10 HYSTERESIS VOLTAGE (µV) –400 –300 –200 –100 0 100 200 300 400 When a reference is used with data converters, it is important to understand how temperature drift affects the overall converter performance. The nonlinearity of the reference output drift represents additional error that is not easily calibrated out of the system. The usual way of showing the reference output drift is to plot the reference voltage vs. temperature (see Figure 12). An alternative method is to draw a straight line between the temperature endpoints and measure the deviation of the output from the straight line. This shows the same data in a different format. This characteristic (see Figure 13) is generated by normalizing the measured drift characteristic to the endpoint average drift. The residual drift error of approximately 500 ppm shows that the ADR1581 is compatible with systems that require 10-bit accurate temperature performance. Figure 14. Reverse Voltage Hysteresis Distribution |
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