Texas Instruments recommends a 4-layer PCB with a dedicated analog ground plane, and to keep the analog and digital signals separate. Additionally, use short and direct traces for the analog inputs, and avoid running digital signals near the analog inputs.
The gain and offset can be configured using the internal PGA (Programmable Gain Amplifier) and the offset adjustment pin (OS0/OS1). Consult the datasheet for the gain and offset calculation formulas, and use the TI-provided calculation tools or simulation software to determine the optimal settings for your application.
The maximum sampling rate of the ADS7816UB/2K5 is 250 kSPS. However, the actual achievable sampling rate depends on the system clock frequency, conversion mode, and other factors. Higher sampling rates increase power consumption, so it's essential to balance the sampling rate with power consumption requirements.
The internal VREF is suitable for most applications, but if you require a more accurate or adjustable reference voltage, use an external reference voltage (EXTREF) connected to the REF pin. Ensure the external reference voltage is within the specified range (2.5 V ± 10%) and meets the required accuracy and stability requirements.
Select the input range that matches your signal amplitude, and consider the PGA gain settings to optimize the signal-to-noise ratio (SNR). Ensure the input signal is within the specified range (±VREF or ±EXTREF) to avoid clipping or saturation. Use the datasheet's input range and scaling tables to determine the optimal settings for your application.
ADS7816UB/2K5 datasheet
by Texas Instruments
