Texas Instruments recommends a star-ground layout, with the REF5025AIDRG4 placed close to the analog-to-digital converter (ADC) or digital-to-analog converter (DAC) it is supplying. The device should be placed on a solid ground plane, and decoupling capacitors should be placed as close as possible to the device.
To ensure stability and accuracy over temperature, it is recommended to use a low-ESR decoupling capacitor (e.g. 10uF ceramic capacitor) and to keep the device away from heat sources. Additionally, the device should be operated within its specified temperature range (-40°C to 125°C) and the output voltage should be buffered with an op-amp if it needs to drive a long trace or a heavy load.
Yes, the REF5025AIDRG4 can be used as a reference for multiple ADCs or DACs, but it is recommended to buffer the output voltage with an op-amp to prevent loading and ensure accuracy. Additionally, the total load current should not exceed the maximum output current of the device (10mA).
The output voltage tolerance of the REF5025AIDRG4 can be calculated by adding the initial accuracy (±0.2% at 25°C) to the temperature coefficient (±10ppm/°C). For example, at 50°C, the output voltage tolerance would be ±0.4% (±0.2% initial accuracy + ±10ppm/°C x 25°C).
Yes, the REF5025AIDRG4 is suitable for high-reliability applications due to its high accuracy, low noise, and low drift over temperature. Additionally, it is available in a hermetic package option (REF5025AIDRGT) which provides enhanced reliability and durability.
REF5025AIDRG4 datasheet
by Texas Instruments
