Texas Instruments recommends a 4-layer PCB with a solid ground plane, and to keep the analog and digital signals separate. The analog input traces should be short and direct, and the digital output traces should be routed away from the analog inputs. Additionally, decoupling capacitors should be placed close to the device.
To minimize EMI, use a low-inductance path for the digital outputs, keep the output traces short and away from the analog inputs, and use a common-mode choke or ferrite bead to filter the output signals. Additionally, consider using a shielded cable or a twisted pair for the digital output signals.
The recommended power-up sequence is to apply the analog power supply (AVDD) first, followed by the digital power supply (DVDD), and then the clock signal. This ensures that the internal analog and digital circuits are properly initialized and avoids latch-up or damage.
The ADS7864Y/2K has an internal calibration circuit that can be used to calibrate the device. The calibration process involves applying a known input voltage and adjusting the internal calibration registers to achieve optimal accuracy and linearity. Texas Instruments provides a calibration procedure in the device's datasheet and application notes.
The maximum sampling rate of the ADS7864Y/2K is 250 kSPS. However, the actual sampling rate may be limited by the clock frequency, the analog input bandwidth, and the digital output data rate. Additionally, the device's performance may degrade at high sampling rates due to increased noise and distortion.
ADS7864Y/2K datasheet
by Texas Instruments
