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ADT7516 Datasheet(PDF) 12 Page - Analog Devices |
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ADT7516 Datasheet(HTML) 12 Page - Analog Devices |
12 / 44 page ADT7516/ADT7517/ADT7519 Rev. A | Page 12 of 44 DAC-to-DAC Crosstalk This is 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. It 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 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 This is 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, expressed in dB. Round Robin This term is used to describe the ADT7516/ADT7517/ ADT7519 cycling through the available measurement channels in sequence, taking a measurement on each channel. DAC Output Settling Time This is the time required, following a prescribed data change, for the output of a DAC to reach and remain within ±0.5 LSB of the final value. A typical prescribed change is from 1/4 scale to 3/4 scale. AMPLIFIER FOOTROOM LOWER DEADBAND CODES NEGATIVE OFFSET ERROR GAIN ERROR + OFFSET ERROR ACTUAL OUTPUT VOLTAGE NEGATIVE OFFSET ERROR DAC CODE IDEAL Figure 8. DAC Transfer Function with Negative Offset ACTUAL GAIN ERROR + OFFSET ERROR UPPER DEADBAND CODES OUTPUT VOLTAGE POSITIVE OFFSET ERROR DAC CODE FULL SCALE IDEAL Figure 9. DAC Transfer Function with Positive Offset (VREF = VDD) |
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