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AD7538AQ Datasheet(PDF) 8 Page - Analog Devices |
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AD7538AQ Datasheet(HTML) 8 Page - Analog Devices |
8 / 16 page AD7538 Rev. B | Page 8 of 16 TERMINOLOGY Relative Accuracy Relative accuracy or endpoint nonlinearity is a measure of the maximum deviation from a straight line passing through the endpoints of the DAC transfer function. It is measured after adjusting for zero error and full-scale error and is normally expressed in least significant bits or as a percentage of full- scale reading. Differential Nonlinearity 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 over the operating temperature range ensures monotonicity. Gain Error Gain error is a measure of the output error between an ideal DAC and the actual device output. It is measured with all 1s in the DAC after the offset error has been adjusted out and is expressed in least significant bits. Gain error is adjustable to zero with an external potentiometer. Digital-To-Analog Glitch Impulse The amount of charge injected from the digital inputs to the analog output when the inputs change state is called digital-to- analog glitch impulse. This is normally specified as the area of the glitch in either pA-secs or nV-secs depending upon whether the glitch is measured as a current or voltage. It is measured with VREF = AGND. Output Capacitance This is the capacitance from IOUT to AGND. Output Leakage Current Output leakage current is current which appears at IOUT with the DAC register loaded to all 0s. Multiplying Feedthrough Error This is the ac error due to capacitive feedthrough from the VREF terminal to IOUT with the DAC register loaded to all zeros. |
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