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AD589TH883B 데이터시트(PDF) 4 Page - Analog Devices |
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AD589TH883B 데이터시트(HTML) 4 Page - Analog Devices |
4 / 8 page AD589 –4– UNDERSTANDING THE SPECIFICATIONS Voltage Variation Versus 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 measurement 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 consistently follows the curve shown in Figure 1. Three-point measurement guarantees the error band over the specified temperature range. The temperature coefficients specified in the Specifications section represent the slopes of the diagonals of the error band from 25°C to TMIN and 25°C to TMAX. ������ ������ ��� ������ ������ ��� ������ ��� ������ ��� �� �� �� � ����������� ���� Figure 1.Typical AD589Temperature Characteristics ���� ��� � �� �� � ���� ��� �� �� ��������� ���� Figure 2. Noise Spectral Density Dynamic Performance Many low power instrument manufacturers are becoming increas- ingly concerned with the turn-on characteristics of the components being used in their systems. Fast turn-on components 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 dis- plays the turn-on characteristics of the AD589. This characteristic is generated from cold-start operation 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 mV is about 25 s, and there is no long thermal tail appearing after that point. �� �� ��� �� ����� ���� ���� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� Figure 4. Schematic Diagram REV. C |
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