DAC80504 datasheet(40/50 Pages) TI2

40 / 50 page

ANALOG SIDE

DIGITAL SIDE

BYPASS CAPACITORS

BYPASS CAPACITOR

GND POUR

DAC80504, DAC70504, DAC60504

SBAS871C – AUGUST 2017 – REVISED JANUARY 2019

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Product Folder Links: DAC80504 DAC70504 DAC60504

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10 Power Supply Recommendations

The DACx0504 operates within the specified VDD supply range of 2.7 V to 5.5 V, and VIO supply range of 1.7 V to

5.5 V. The DACx0504 does not require specific supply sequencing.

The VDD supply must be well-regulated and low-noise. Switching power supplies and dc-dc converters often have

high-frequency glitches or spikes riding on the output voltage. In addition, digital components can create similar

high-frequency spikes. This noise can easily couple into the DAC output voltage through various paths between

the power connections and analog output. In order to further minimize noise from the power supply, include a 1-

μF to 10-μF capacitor and 0.1-μF bypass capacitor. The current consumption on the VDD pin, the short-circuit

current limit, and the load current for the device is listed in the Electrical Characteristics. The power supply must

meet the aforementioned current requirements.

11 Layout

11.1 Layout Guidelines

A precision analog component requires careful layout, the list below provides some insight into good layout

practices.

•

Bypass all power supply pins to ground with a low-ESR ceramic bypass capacitor. The typical recommended

bypass capacitance is 0.1-µF to 0.22-µF ceramic with a X7R or NP0 dielectric.

•

Place power supplies and REF bypass capacitors close to the pins to minimize inductance and optimize

performance.

•

Use a high-quality ceramic type NP0 or X7R for its optimal performance across temperature, and very low

dissipation factor.

•

The digital and analog sections must have proper placement with respect to the digital pins and analog pins

of the DACx0504 device. The separation of analog and digital blocks minimizes coupling into neighboring

blocks, as well as interaction between analog and digital return currents.

11.2 Layout Example

Figure 78. DACx0504 Layout Example

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