Texas Instruments recommends a star-ground connection, with the REF3440QDGKRQ1 placed close to the analog-to-digital converter (ADC) or digital-to-analog converter (DAC), and using a separate analog ground plane to minimize digital noise coupling. Additionally, keep the input and output traces short and away from high-frequency signals.
Use a low-impedance power source, and decouple the REF3440QDGKRQ1 with a 10-µF ceramic capacitor in parallel with a 1-µF ceramic capacitor, both placed close to the device. Additionally, use a 0.1-µF ceramic capacitor between the VCC and GND pins to filter high-frequency noise.
The REF3440QDGKRQ1 has a typical start-up time of 10 ms. Ensure that your system's power-on sequence allows for this start-up time before using the reference voltage output. You may need to add a delay or use a power-on reset circuit to ensure the REF3440QDGKRQ1 is stable before using its output.
Use a low-pass filter, such as a RC filter or an active filter, to attenuate the output noise and ripple. You can also use a noise-reducing capacitor, such as a 10-nF ceramic capacitor, in parallel with the output to further reduce noise.
The REF3440QDGKRQ1 has a typical output impedance of 0.5 Ω. This low output impedance ensures that the reference voltage output is stable and can drive capacitive loads. However, if your system requires a higher output impedance, you may need to add a buffer amplifier or an output resistor to match the impedance.
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About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.
