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AD1315 Datenblatt(PDF) 4 Page - HANAMICRON |
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AD1315 Datenblatt(HTML) 4 Page - HANAMICRON |
4 / 8 page AD1315 –4– REV. A DEFINITION OF TERMS Gain The measured transconductance. Gain = I OUT (@ 5V Input ) − IOUT (@ 0. 2V Input ) V PROG(@ 5V ) −V PROG(@ 0.2V ) where: VPROG values are measured at IOL/IOH PROG Gain Error The difference between the measured transconductance and the ideal expressed as a % of full-scale range. Ideal Gain = 10 mA/V Gain Error = Ideal Gain − Actual Gain Ideal Gain ×100 Offset Error Offset Error is measured by setting the IOHPROG or IOLPROG inputs to 0.2 V and measuring IOUT. Since both IOH and IOL Figure 1. Definition of Terms Figure 2. Timing Diagram for Inhibit Transition outputs are unipolar, this small initial offset of 2 mA must be set to allow for measurement of possible negative offset. With a gain of 10 mA/V, a 0.2 V input should yield an output of ±2 mA. The difference between the observed output and the ideal ±2mA output is the offset error. Offset Error = IOUT (@ 0.2 V) – Gain VPROG (@ 0.2 V) Linearity Error The deviation of the transfer function from a straight line de- fined by Offset and Gain expressed as a % of FSR. IOUT (calc) = Gain VPROG (@ set point) + Offset where: set point = VPROG (from 0.2 V to 5 V) IOUT (FSR) = Gain VPROG (@ 5 V) + Offset Linearity Error I OUT (measured ) − IOUT ( calc) IOUT (FSR ) ×100 Figure 3. IOL, IOH Offset Current vs. Temperature Figure 4. IOL, IOH Gain Error vs. Temperature Figure 5. IOL, IOH Linearity Error vs. Current Program Voltage |
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