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AD7846JNZ Datasheet(PDF) 10 Page - Analog Devices |
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AD7846JNZ Datasheet(HTML) 10 Page - Analog Devices |
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10 / 24 page  AD7846 Rev. G | Page 10 of 24 TERMINOLOGY Least Significant Bit This is the analog weighting of 1 bit of the digital word in a DAC. For the AD7846, 1 LSB = (VREF+ − VREF−)/216. 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 both endpoints (that is, offset and gain errors are adjusted out) and is normally expressed in least significant bits or as a percentage of full-scale range. Differential Nonlinearity Differential nonlinearity is the difference between the measured change and the ideal change between any two adjacent codes. A specified differential nonlinearity of ±1 LSB 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 with all 1s loaded after offset error has been adjusted out. Gain error is adjustable to zero with an external potentiometer. Offset Error This is the error present at the device output with all 0s loaded in the DAC. It is due to op amp input offset voltage and bias current and the DAC leakage current. Bipolar Zero Error When the AD7846 is connected for bipolar output and 10…000 is loaded to the DAC, the deviation of the analog output from the ideal midscale of 0 V is called the bipolar zero error. Digital-to-Analog Glitch Impulse This is the amount of charge injected from the digital inputs to the analog output when the inputs change state. This is normally specified as the area of the glitch in either pA-sec or nV-sec depending upon whether the glitch is measured as a current or a voltage. Multiplying Feedthrough Error This is an ac error due to capacitive feedthrough from either of the VREF terminals to VOUT when the DAC is loaded with all 0s. Digital Feedthrough When the DAC is not selected (that is, CS is held high), high frequency logic activity on the digital inputs is capacitively coupled through the device to show up as noise on the VOUT pin. This noise is digital feedthrough. |
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