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ICM7343QG Datasheet(PDF) 8 Page - IC MICROSYSTEMS |
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ICM7343QG Datasheet(HTML) 8 Page - IC MICROSYSTEMS |
8 / 10 page ICM7363/7343/7323 QUAD 12/10/8-BIT VOLTAGE-OUTPUT DACS Rev. A8 ICmic reserves the right to change the specifications without prior notice. 8 IC MICROSYSTEMS ICmic APPLICATIONS INFORMATION Power Supply Bypassing and Layout Considerations As in any precision circuit, careful consideration has to be given to layout of the supply and ground. The return path from the GND to the supply ground should be short with low impedance. Using a ground plane would be ideal. The supply should have some bypassing on it. A 10 µF tantalum capacitor in parallel with a 0.1 µF ceramic with a low ESR can be used. Ideally these would be placed as close as possible to the device. Avoid crossing digital and analog signals, specially the reference, or running them close to each other. Output Swing Limitations The ideal rail-to-rail DAC would swing from GND to VDD however, offset and gain error limit this ability. Figure 5 illustrates how a negative offset error will affect the output. The output will limit close to ground since this is single supply part, resulting in a deadband area. As a larger input is loaded into the DAC the output will eventually rise above ground. This is why the linearity is specified for a starting code greater than zero. Figure 6 illustrates how a gain error or positive offset error will affect the output when it is close to VDD. A positive gain error or positive offset will cause the output to be limited to the positive supply voltage resulting in a deadband of codes close to full-scale. This can be avoided by using a reference voltage slightly less then 0.5 x VDD ensuring that the full-scale of the DAC is always less than VDD. DEADBAND NEGATIVE OFFSET Figure 5: Effect of Negative Offset DEADBAND POSITIVE OFFSET OFFSET AND GAIN ERROR VDD Figure 6: Effect of Gain Error and Positive Offset |
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