Texas Instruments recommends a 4-layer PCB with a dedicated analog ground plane, and to keep the analog and digital signals separate. The datasheet provides a recommended layout and routing guide, but it's also recommended to consult the TI application note 'AN-1187: PCB Layout Guidelines for the ADS1250' for more detailed information.
The ADS1250U/1K 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 gain and offset registers to match the expected output. TI provides an application note 'AN-1189: Calibration and Testing of the ADS1250' that provides a step-by-step guide on how to perform calibration.
The ADS1250U/1K has an absolute maximum input voltage rating of ±VCC + 0.3V, but it's recommended to limit the input voltage to ±VCC to ensure reliable operation. Exceeding the maximum input voltage can damage the device, so it's essential to ensure that the input voltage is within the recommended range.
The ADS1250U/1K outputs 24-bit data, and it's essential to handle the data correctly to ensure accurate readings. TI recommends using a 32-bit register to store the data and to perform any necessary scaling or offset adjustments. It's also recommended to use a FIFO or a buffer to handle the data and prevent data loss or corruption.
The recommended clock frequency for the ADS1250U/1K is between 2.5 MHz and 4 MHz. The clock frequency affects the conversion rate, noise performance, and power consumption. A higher clock frequency can provide faster conversion rates, but it may also increase noise and power consumption. TI provides a clock frequency selection guide in the datasheet to help engineers choose the optimal clock frequency for their application.
ADS1250U/1K datasheet
by Texas Instruments
Findchips
