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AD5398 Arkusz danych(PDF) 9 Page - Analog Devices |
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AD5398 Arkusz danych(HTML) 9 Page - Analog Devices |
9 / 16 page AD5398 Rev. A | Page 9 of 16 TERMINOLOGY Relative Accuracy For the DAC, relative accuracy or integral nonlinearity is a measurement of the maximum deviation, in LSB, from a straight line passing through the endpoints of the DAC transfer function. A typical INL vs. code plot is shown in Figure 4. Differential Nonlinearity (DNL) Differential nonlinearity 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 monotonicity. This DAC is guaranteed monotonic by design. A typical DNL vs. code plot is shown in Figure 5. Zero-Code Error Zero-code error is a measurement of the output error when zero code (0x0000) is loaded to the DAC register. Ideally the output is 0 mA. The zero-code error is always positive in the AD5398 because the output of the DAC cannot go below 0 mA. This is due to a combination of the offset errors in the DAC and output amplifier. Zero-code error is expressed in mA. Gain Error This is a measurement of the span error of the DAC. It is the deviation in slope of the DAC transfer characteristic from the ideal, expressed as a percent of the full-scale range. Gain Error Drift This is a measurement of the change in gain error with changes in temperature. It is expressed in LSB/°C. Digital-to-Analog Glitch Impulse Digital-to-analog glitch impulse is the impulse injected into the analog output when the input code in the DAC register changes state. It is normally specified as the area of the glitch in nA-s and is measured when the digital input code is changed by 1 LSB at the major carry transition. Digital Feedthrough Digital feedthrough is a measurement of the impulse injected into the analog output of the DAC from the digital inputs of the DAC, but is measured when the DAC output is not updated. It is specified in nA-s and measured with a full-scale code change on the data bus, that is, from all 0s to all 1s and vice versa. Offset Error Offset error is a measurement of the difference between ISINK (actual) and IOUT (ideal) in the linear region of the transfer function, expressed in mA. Offset error is measured on the AD5398 with Code 16 loaded into the DAC register. Offset Error Drift This is a measurement of the change in offset error with a change in temperature. It is expressed in μV/°C. |
Podobny numer części - AD5398 |
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Podobny opis - AD5398 |
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