Texas Instruments provides a recommended PCB layout in the REF3220AIDBVR datasheet, which includes guidelines for component placement, trace routing, and thermal management. Additionally, TI recommends using a 4-layer PCB with a solid ground plane to minimize noise and ensure good thermal dissipation.
The REF3220AIDBVR has a relatively high output noise of 100 μVpp (typical) at 0.1 Hz to 10 Hz. To minimize the impact of output noise, TI recommends using a low-pass filter or a noise-reducing capacitor (e.g., 10 nF to 100 nF) at the output pin. Additionally, ensuring good power supply decoupling and using a low-noise power supply can help reduce output noise.
The REF3220AIDBVR is specified to operate from -40°C to 125°C (junction temperature). However, TI recommends derating the output current and voltage at high temperatures to ensure reliable operation. For example, at 125°C, the output current should be limited to 10 mA, and the output voltage should be derated by 1% per degree Celsius above 85°C.
TI recommends powering the REF3220AIDBVR from a low-noise, well-regulated power supply. A 10 μF to 100 μF decoupling capacitor should be placed close to the device's power pins to filter out high-frequency noise. Additionally, a 1 μF to 10 μF capacitor can be used to decouple the output pin to further reduce noise and improve stability.
The REF3220AIDBVR is an automotive-qualified device, meeting the requirements of AEC-Q100 Grade 1. However, TI recommends following the guidelines for high-reliability design and manufacturing, including using a robust PCB design, ensuring good thermal management, and following proper assembly and testing procedures.
REF3220AIDBVR datasheet
by Texas Instruments
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