The REF3140AIDBZR is a high-precision voltage reference, and its performance can be affected by the PCB layout and component placement. It is recommended to follow a star-grounding scheme, keep the device away from high-current paths, and use a solid ground plane to minimize noise. Additionally, place the device close to the analog-to-digital converter (ADC) or digital-to-analog converter (DAC) to reduce noise and improve performance.
To ensure proper bypassing and decoupling, use a 10-100 nF ceramic capacitor between the VCC pin and the GND pin, and a 1-10 μF electrolytic capacitor between the VCC pin and the GND pin. Place these capacitors as close to the device as possible to minimize inductance and improve decoupling. Additionally, use a low-ESR capacitor to minimize oscillations.
The recommended input voltage range for the REF3140AIDBZR is 4.5-18 V. The output voltage is relatively insensitive to input voltage variations, but the device's performance may degrade if the input voltage is outside this range. Ensure the input voltage is within the recommended range to maintain optimal performance and output voltage stability.
The REF3140AIDBZR's output voltage has a typical temperature coefficient of ±1 ppm/°C. This means that for every 1°C change in temperature, the output voltage will change by approximately ±1 ppm. This temperature coefficient is relatively low, making the REF3140AIDBZR suitable for applications requiring high precision and stability over a wide temperature range.
The recommended output capacitor value for the REF3140AIDBZR is 10-100 nF. A ceramic or film capacitor with a low equivalent series resistance (ESR) is recommended. The output capacitor helps to filter out high-frequency noise and improve the output voltage stability. A larger capacitor value can improve the output voltage stability, but may also increase the device's settling time.
REF3140AIDBZR datasheet
by Texas Instruments
