The recommended power-up sequence is to power up the digital supply (VDD) first, followed by the analog supply (AVDD). This ensures that the digital circuitry is powered up before the analog circuitry, which helps to prevent any potential latch-up conditions.
To ensure accurate output voltage levels, it is essential to use a high-precision voltage reference (VREF) and to decouple the analog supply (AVDD) and voltage reference (VREF) pins with high-quality capacitors. Additionally, the output voltage levels can be affected by the load impedance, so it is recommended to use a buffer amplifier or an op-amp to drive the load.
The maximum update rate of the DAC902EG4 is 1 MSPS (million samples per second). However, the actual update rate may be limited by the interface clock frequency, the settling time of the output voltage, and the system's overall throughput.
To handle the output glitch during power-up or power-down, it is recommended to use an external output buffer or op-amp with a slew-rate limiting feature. This helps to slow down the output voltage transition and reduce the glitch amplitude. Additionally, the power-up and power-down sequences can be controlled using external logic to minimize the glitch duration.
The recommended layout and routing for the DAC902EG4 involves separating the analog and digital signal paths, using a solid ground plane, and minimizing the length of the analog signal traces. It is also recommended to use a star-configuration for the power supply connections and to decouple the power supply pins with high-quality capacitors.
DAC902EG4 datasheet
by Texas Instruments
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