The recommended power-up sequence is to apply VCC first, followed by AVCC, and then the digital inputs. This ensures that the internal voltage regulators are powered up correctly.
To ensure accurate voltage output, it is essential to use a low-noise, low-impedance voltage reference, and to decouple the reference input with a capacitor. Additionally, the output voltage should be buffered with an op-amp to prevent loading effects.
The DAC904E can handle clock frequencies up to 40 MHz. However, the maximum clock frequency may be limited by the specific application and the quality of the clock signal.
To minimize digital noise coupling, use separate analog and digital ground planes, and keep the digital signals away from the analog output. Additionally, use a low-pass filter or a ferrite bead to filter out high-frequency noise on the digital lines.
The recommended layout and routing for the DAC904E involves keeping the analog and digital signals separate, using a star-ground configuration, and minimizing the length of the analog output traces. Additionally, use a solid ground plane and avoid routing digital signals under the analog output.
DAC904E datasheet
by Texas Instruments
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