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AD1580BRT-REEL7 Datasheet(PDF) 7 Page - Analog Devices |
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AD1580BRT-REEL7 Datasheet(HTML) 7 Page - Analog Devices |
7 / 12 page AD1580 Rev. F | Page 7 of 12 1.2238 1.2248 1.2250 1.2252 1.2254 1.2256 1.2258 1.2244 1.2246 1.2240 1.2242 VMAX VMIN SLOPE = TC = (VMAX – VO) (+85°C – +25°C) × 1.225 × 10–6 SLOPE = TC = (VMIN – VO) (–40°C – +25°C) × 1.225 × 10–6 VO –55 –35 –15 5 25 45 65 85 105 125 TEMPERATURE (°C) Figure 13. Output Voltage vs. Temperature For example, the AD1580BRT initial tolerance is ±1 mV; a ±50 ppm/°C temperature coefficient corresponds to an error band of ±4 mV (50 × 10−6 × 1.225 V × 65°C). Thus, the unit is guaranteed to be 1.225 V ± 5 mV over the operating temperature range. Duplication of these results requires a combination of high accuracy and stable temperature control in a test system. Evaluation of the AD1580 produces a curve similar to that in Figure 5 and Figure 13. VOLTAGE OUTPUT NONLINEARITY vs. TEMPERATURE 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 an additional error that is not easily calibrated out of the system. This characteristic (see Figure 14) is generated by normalizing the measured drift characteristic to the end point average drift. The residual drift error of approximately 500 ppm shows that the AD1580 is compatible with systems that require 10-bit accurate temperature performance. 600 300 0 500 400 200 100 –55 –35 –15 5 25 45 65 85 105 125 TEMPERATURE (°C) Figure 14. Residual Drift Error REVERSE VOLTAGE HYSTERESIS 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 measur- ing the difference between the output voltage at +25°C after operation at +85°C and the output, at +25°C after operation at −40°C. Figure 15 displays the hysteresis associated with the AD1580. This characteristic exists in all references and has been minimized in the AD1580. 0 15 20 25 30 35 40 5 10 HYSTERESIS VOLTAGE (µV) –400 –300 –200 –100 0 100 200 300 400 Figure 15. Reverse Voltage Hysteresis Distribution OUTPUT IMPEDANCE vs. FREQUENCY Understanding the effect of the reverse dynamic output imped- ance in a practical application may be important to successfully apply the AD1580. A voltage divider is formed by the AD1580 output impedance and the external source impedance. When an external source resistor of about 30 kΩ (IR = 100 μA) is used, 1% of the noise from a 100 kHz switching power supply is devel- oped at the output of the AD1580. Figure 16 shows how a 1 µF load capacitor connected directly across the AD1580 reduces the effect of power supply noise to less than 0.01%. 1k 10 0.1 1 100 FREQUENCY (Hz) CL = 0 CL = 1µF ΔIR = 0.1IR IR = 100µA IR = 1mA 10 100 1k 10k 100k 1M Figure 16. Output Impedance vs. Frequency |
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