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AD5326BRU-REEL7 Folha de dados(PDF) 9 Page - Analog Devices |
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AD5326BRU-REEL7 Folha de dados(HTML) 9 Page - Analog Devices |
9 / 24 page AD5306/AD5316/AD5326 Rev. F | Page 9 of 24 TERMINOLOGY Relative Accuracy or Integral Nonlinearity (INL) For the DAC, it is a measure, in LSB, of the maximum deviation from a straight line passing through the endpoints of the DAC transfer function. Typical INL vs. code plots are shown in Figure 6, Figure 7, and Figure 8. Differential Nonlinearity (DNL) 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. Typical DNL vs. code plots are shown in Figure 9, Figure 10, and Figure 11. Offset Error A measure of the offset error of the DAC and the output ampli- fier. It can be positive or negative. See Figure 4 and Figure 5. Offset error is expressed in mV. Gain Error 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. Offset Error Drift A measure of the change in offset error with changes in temperature. Offset error drift is expressed in (ppm of full-scale range)/°C. Gain Error Drift A measure of the change in gain error with changes in temperature. Gain error drift is expressed in (ppm of full-scale range)/°C. DC Power Supply Rejection Ratio (PSRR) This indicates how the output of the DAC is affected by changes in the supply voltage. PSRR is the ratio of the change in VOUT to a change in VDD for full-scale output of the DAC. PSRR is measured in dB. VREF is held at 2 V and VDD is varied 10%. DC Crosstalk The dc change in the output level of one DAC at midscale in response to a full-scale code change (all 0s to all 1s, and vice versa) and output change of another DAC. DC crosstalk is expressed in μV. Reference Feedthrough The ratio of the amplitude of the signal at the DAC output to the reference input when the DAC output is not being updated, that is, when LDAC is high. Reference feedthrough is expressed in dB. Channel-to-Channel Isolation The ratio of the amplitude of the signal at the output of one DAC to a sine wave on the reference input of another DAC. Channel-to-channel isolation is measured in dB. Major-Code Transition Glitch Energy The energy of the impulse injected into the analog output when the code in the DAC register changes state. This energy 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 A measure of the impulse injected into the analog output of a DAC from the digital input pins of the device when the DAC output is not being updated. Digital feedthrough is specified in nV-s and is measured with a worst-case change on the digital input pins (that is, from all 0s to all 1s, and vice versa). Digital Crosstalk The glitch impulse transferred to the output of one DAC at midscale in response to a full-scale code change (all 0s to all 1s, and vice versa) in the input register of another DAC. The energy of the glitch is expressed in nV-s. Analog Crosstalk The glitch impulse transferred to the output of one DAC due to a change in the output of another DAC. Analog crosstalk is measured by loading one of the DACs with a full-scale code change (all 0s to all 1s, and vice versa) while keeping LDAC high and then pulsing LDAC low and monitoring the output of the DAC whose digital code has not changed. The energy of the glitch is expressed in nV-s. DAC-to-DAC Crosstalk The glitch impulse transferred to the output of one DAC due to a digital code change and subsequent output change of another DAC. This includes both digital and analog crosstalk. Crosstalk is measured by loading one of the DACs with a full-scale code change (all 0s to all 1s, and vice versa) with LDAC low and then monitoring the output of another DAC. The energy of the glitch is expressed in nV-s. Multiplying Bandwidth The amplifiers within the DAC have a finite bandwidth. The multiplying bandwidth is a measure of this. A sine wave on the reference (with full-scale code loaded to the DAC) appears on the output. The multiplying bandwidth is the frequency at which the output amplitude falls to 3 dB below the input. Total Harmonic Distortion (THD) The difference between an ideal sine wave and its attenuated version using the DAC. The sine wave is used as the reference for the DAC, and the THD is a measure of the harmonics present on the DAC output. THD is measured in dB. |
Nº de peça semelhante - AD5326BRU-REEL7 |
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Descrição semelhante - AD5326BRU-REEL7 |
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