A good PCB layout is crucial for this voltage reference. TI recommends a star-ground configuration, with the REF35180QDBVRQ1 at the center, and separate analog and digital grounds. Keep the input and output capacitors close to the device, and use a solid ground plane to minimize noise and thermal gradients.
To ensure accurate voltage output over temperature, it's essential to follow the recommended operating conditions, including the specified temperature range (-40°C to 125°C). Additionally, consider using a thermally conductive material for the PCB, and ensure good airflow around the device. You can also use external temperature compensation circuits or thermistors to improve accuracy.
Although the datasheet specifies a minimum input voltage of 4.5V, TI recommends an input voltage range of 5V to 18V for optimal performance and stability. Operating the device outside this range may affect its accuracy and long-term reliability.
To prevent unwanted voltage transients and ensure proper operation, it's recommended to sequence the power-up and power-down of the REF35180QDBVRQ1. Power up the input voltage (VIN) before enabling the output (VOUT), and power down the output before removing the input voltage. You can use a power sequencing controller or a simple RC circuit to achieve this.
The REF35180QDBVRQ1 has a typical output noise of around 10µVpp (peak-to-peak) in the 0.1Hz to 10Hz frequency range. This is relatively low and suitable for most applications. However, if you require even lower noise, consider using external filtering or noise reduction techniques.
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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.
