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AD5321BRM Arkusz danych(PDF) 8 Page - Analog Devices |
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AD5321BRM Arkusz danych(HTML) 8 Page - Analog Devices |
8 / 24 page AD5301/AD5311/AD5321 Rev. B | Page 8 of 24 TERMINOLOGY Relative Accuracy For the DAC, relative accuracy or integral nonlinearity (INL) is a measure of the maximum deviation, in LSBs, from a straight line passing through the actual endpoints of the DAC transfer function. Typical INL vs. code plots can be seen in Figure 5 to Figure 7. Differential Nonlinearity (DNL) DNL is the difference between the measured change and the ideal 1 LSB change between any two adjacent codes. A specified differential nonlinearity of ±1 LSB maximum ensures monotonic- ity. These DACs are guaranteed monotonic by design over all codes. Typical DNL vs. code plots can be seen in Figure 8 to Figure 10. Zero-Code Error Zero-code error is a measure of the output error when zero code (0x00) is loaded to the DAC register. Ideally, the output should be 0 V. The zero-code error of the AD5301/AD5311/ AD5321 is always positive because the output of the DAC cannot go below 0 V, due to a combination of the offset errors in the DAC and output amplifier. It is expressed in millivolts, see Figure 12. Full-Scale Error (FSR) Full-scale error is a measure of the output error when full scale is loaded to the DAC register. Ideally, the output should be VDD – 1 LSB. Full-scale error is expressed in percent of FSR. A plot can be seen in Figure 12. Gain Error Gain error is a measure of the span error of the DAC. It is the deviation in slope of the actual DAC transfer characteristic from the ideal expressed as a percentage of the full-scale range. Zero-Code Error Drift Zero-code error drift is a measure of the change in zero-code error with a change in temperature. It is expressed in μV/°C. Gain Error Drift Gain error drift is a measure of the change in gain error with changes in temperature. It is expressed in (ppm of full-scale range)/°C. Major Code Transition Glitch Energy Major code transition glitch energy is the energy of the impulse injected into the analog output when the code in the DAC register changes state. It is normally specified as the area of the glitch in nV-s and is measured when the digital code is changed by 1 LSB at the major carry transition (011 . . . 11 to 100 . . . 00 or 100 . . . 00 to 011 . . . 11). Digital Feedthrough Digital feedthrough is a measure of the impulse injected into the analog output of the DAC from the digital input pins of the device, but is measured when the DAC is not being written to. It is specified in nV-s and is measured with a full-scale change on the digital input pins, that is, from all 0s to all 1s and vice versa. |
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