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AD589JR 데이터시트(PDF) 3 Page - Analog Devices |
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AD589JR 데이터시트(HTML) 3 Page - Analog Devices |
3 / 4 page Understanding the Specifications–AD589 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 Centigrade; i.e., 10 ppm/ °C. However, because of nonlinearities in temperature characteristics, which originated in standard Zener references (such as “S” type characteristics) most manufacturers have begun to use a maximum limit error band approach to specify devices. This technique involves measure- ment of the output at 3, 5 or more different temperatures to guarantee that the output voltage will fall within the given error band. The temperature characteristics of the AD589 consis- tently follows the curve shown in Figure 1. Three-point measurement guarantees the error band over the specified temperature range. The temperature coefficients specified on the previous page represent the slopes of the diagonals of the error band from +25 °C to T MIN and +25°C to TMAX. 1.2370 1.2345 +125 1.2360 1.2350 –25 1.2355 –50 1.2365 +100 +75 +50 +25 0 TEMPERATURE – °C Figure 1. Typical AD589 Temperature Characteristics 1000 100 0 10 100 1M 100k 10k 1k 10 FREQUENCY – Hz Figure 2. Noise Spectral Density DYNAMIC PERFORMANCE Many low power instrument manufacturers are becoming increasingly concerned with the turn-on characteristics of the components being used in their systems. Fast turn-on compo- nents often enable the end user to keep power off when not needed, and yet respond quickly when the power is turned on for operation. Figure 3 displays the turn-on characteristics of the AD589. This characteristic is generated from cold-start opera- tion and represents the true turn-on waveform after an extended period with the supplies off. The figure shows both the coarse and fine transient characteristics of the device; the total settling time to within ±1 millivolt is about 25 µs, and there is no long thermal tail appearing after that point. 10 90 100 0% 200mV 10µs 10mV Figure 3. Output Settling Characteristics R1 R5 R6 R2 R7 C1 Q2 R4 Q1 R3 Q3 Q4 –V +V Q5 Q8 Q7 Q9 Figure 4. Schematic Diagram REV.B –3– |
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