Texas Instruments provides a layout guide in the datasheet, but it's also recommended to follow general high-impedance analog layout practices, such as separating analog and digital grounds, using a solid ground plane, and minimizing noise coupling. Additionally, it's essential to keep the analog input traces short and away from digital signals.
To handle the high impedance of the analog inputs, it's recommended to use a buffer amplifier or an impedance-matching network to drive the input signal. This helps to reduce the input impedance and prevent signal attenuation. Additionally, the input signal should be driven from a low-impedance source, and the input traces should be kept short and shielded to minimize noise pickup.
To filter out noise and interference, it's recommended to use a combination of passive and active filtering techniques. A passive RC filter can be used to filter out high-frequency noise, while an active filter, such as a notch filter or a band-pass filter, can be used to filter out specific frequency bands. Additionally, shielding the input traces and using a ground plane can help to reduce electromagnetic interference (EMI).
To ensure accurate temperature measurement, it's essential to follow the recommended layout and routing guidelines for the internal temperature sensor. This includes keeping the temperature sensor pin away from heat sources, such as power supplies and digital circuits, and using a solid ground plane to reduce thermal gradients. Additionally, the temperature sensor should be calibrated using the recommended calibration procedure outlined in the datasheet.
The recommended power-up sequence for the ADS112U04IRTET is to power up the analog supply (AVDD) first, followed by the digital supply (DVDD). This ensures that the analog circuitry is powered up before the digital circuitry, which helps to prevent digital noise from coupling into the analog circuitry.
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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.
