Texas Instruments recommends a star-ground layout, with the REF5020AIDRG4 placed close to the analog-to-digital converter (ADC) or digital-to-analog converter (DAC) it is supplying, and using a low-impedance ground plane to minimize noise. Additionally, decoupling capacitors should be placed close to the device to filter out high-frequency noise.
To ensure stability and accuracy, the REF5020AIDRG4 should be operated within its recommended operating conditions, including temperature range (-40°C to 125°C) and supply voltage (2.7V to 5.5V). Additionally, a stable and low-noise power supply should be used, and the device should be decoupled from the power supply with a 10uF capacitor.
The typical start-up time for the REF5020AIDRG4 is around 10ms, but it can take up to 100ms to reach its final output voltage. This should be taken into account when designing the power-on sequence for your system, to ensure that the REF5020AIDRG4 has sufficient time to stabilize before the ADC or DAC is enabled.
Yes, the REF5020AIDRG4 can be used as a voltage reference for multiple ADCs or DACs. To connect multiple devices, a separate output pin can be used for each device, or a single output pin can be used with a buffer amplifier to drive multiple loads. However, the total output current should not exceed the maximum rating of 10mA.
To calculate the total error budget, consider the initial accuracy, temperature coefficient, and long-term stability of the REF5020AIDRG4, as well as the accuracy and temperature coefficient of the ADC or DAC it is supplying. Additionally, consider any other sources of error in the system, such as noise, gain errors, and offset errors.
REF5020AIDRG4 datasheet
by Texas Instruments
