ICM7563/7543/7523

Rev. A7

ICmic reserves the right to change specifications without prior notice

8

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 F tantalum capacitor in parallel with a 0.1 F 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

negative offset error will affect the output. The output will limit close to ground since this is single supply part, resulting in a dead-

band 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.

positive offset will cause the output to be limited to the positive supply voltage resulting in a dead-band of codes close to full-scale.

DEADBAND

NEGATIVE

OFFSET

Figure 4. Effect of Negative Offset