Texas Instruments provides a layout guide and PCB design checklist in the ADS8422 datasheet and application notes. It's essential to follow these guidelines to minimize noise and ensure optimal performance. Key considerations include keeping analog and digital signals separate, using a solid ground plane, and minimizing trace lengths and loops.
The ADS8422IBPFBTG4 has an internal calibration mechanism, but it's recommended to perform an external calibration to achieve the highest accuracy. This involves applying a known input voltage and adjusting the offset and gain registers to match the expected output code. Texas Instruments provides a calibration procedure in the datasheet and application notes.
The maximum sampling rate of the ADS8422IBPFBTG4 is 1 MSPS, but it can be adjusted to lower rates to reduce power consumption. The power consumption increases with the sampling rate, so it's essential to balance the sampling rate with power consumption requirements. Texas Instruments provides power consumption vs. sampling rate curves in the datasheet.
The ADS8422IBPFBTG4 has built-in overvoltage and undervoltage protection, but it's still essential to add external protection circuitry to prevent damage from excessive voltage levels. Texas Instruments recommends using voltage clamping diodes and resistors to limit the input voltage to within the specified range.
Texas Instruments recommends using a low-ESR capacitor (e.g., 10uF) and a ferrite bead or inductor in series with the power supply to filter out high-frequency noise. Additionally, a 100nF capacitor should be placed close to the device's power pins to decouple the power supply.
ADS8422IBPFBTG4 datasheet
by Texas Instruments
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