Texas Instruments recommends a 4-layer PCB with a solid ground plane, and to keep the analog and digital signals separate. Use short, direct traces for the analog inputs and outputs, and avoid running digital signals near the analog signals. Additionally, use a common-mode filter capacitor between the analog input pins and the analog ground pin.
Calibration involves adjusting the internal offset and gain of the ADC. TI recommends a two-point calibration process: first, apply a known voltage to the input pins and measure the output code, then apply a second known voltage and measure the output code. Use these two points to calculate the offset and gain correction factors, and apply them to the ADC output data.
The maximum sampling rate of the ADS7959SDBTR is 2 MSPS. However, the power consumption increases with the sampling rate. At 2 MSPS, the typical power consumption is around 35 mW. To reduce power consumption, consider reducing the sampling rate or using the device's power-down mode.
The ADS7959SDBTR has an internal overvoltage protection circuit that limits the input voltage to 5.5 V. However, it's still recommended to add external protection circuitry, such as a voltage limiter or clamp, to prevent damage from excessive voltage. Overvoltage can cause permanent damage to the device, so it's essential to ensure that the input voltage remains within the recommended range.
The ADS7959SDBTR's performance is affected by temperature, with changes in offset, gain, and linearity. To compensate for temperature variations, consider using an external temperature sensor to monitor the device temperature, and apply temperature correction factors to the ADC output data. TI provides temperature coefficients in the datasheet to help with this process.
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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.
