Texas Instruments recommends a 4-layer PCB with a solid ground plane, and a separate analog and digital ground plane. Keep the analog and digital sections separate, and use a ferrite bead or inductor to isolate the analog power supply.
To ensure accurate voltage reference output, use a low-ESR capacitor (e.g., 10uF) between the VOUT pin and GND, and keep the input voltage (VIN) within the recommended range (2.7V to 5.5V). Also, minimize noise and ripple on the input voltage.
The thermal resistance (RθJA) of the REF3330AIDBZRG4 is approximately 45°C/W. This means that for every watt of power dissipated, the junction temperature will rise by 45°C above the ambient temperature.
The REF3330AIDBZRG4 is rated for operation up to 125°C. However, the accuracy and stability of the voltage reference may degrade at high temperatures. Consider using a thermally-enhanced package or a voltage reference with a higher temperature rating if your application requires high-temperature operation.
The output voltage tolerance is specified as ±0.5% (max) over the operating temperature range. To calculate the output voltage tolerance, multiply the nominal output voltage (3.3V) by the tolerance percentage (0.5%). This gives you a tolerance range of ±16.5mV.
REF3330AIDBZRG4 datasheet
by Texas Instruments
