Texas Instruments provides a layout guide in the ADS8864IDRCT datasheet, which recommends a 4-layer PCB with a solid ground plane, and careful routing of analog and digital signals to minimize noise and crosstalk. Additionally, it's recommended to use a low-ESR capacitor for the AVDD pin and to decouple the DVDD pin with a 0.1uF capacitor.
To minimize EMI, it's recommended to use a low-inductance path for the digital outputs, such as a PCB trace with a low impedance and a short length. Additionally, consider using a series resistor or a ferrite bead to reduce the high-frequency energy radiated by the digital outputs. It's also important to ensure that the digital outputs are properly terminated to prevent signal reflections.
The recommended power-up sequence for the ADS8864IDRCT is to first apply the analog power supply (AVDD) and then the digital power supply (DVDD). This ensures that the analog circuitry is powered up before the digital circuitry, which helps to prevent damage or incorrect operation. It's also recommended to ensure that the power supplies are stable and within the recommended voltage range before applying the clock signal.
To optimize the performance of the ADS8864IDRCT in a system with multiple ADCs, it's recommended to consider the following: ensure that each ADC has its own dedicated analog power supply and ground plane, use a common clock source for all ADCs, and consider using a clock jitter cleaner or a phase-locked loop (PLL) to reduce clock jitter. Additionally, ensure that the analog inputs are properly filtered and buffered to prevent noise and crosstalk.
The ADS8864IDRCT has an internal calibration circuit that can be used to calibrate the device. The recommended method is to use the internal calibration circuit to calibrate the device during power-up, and then to use an external calibration signal to fine-tune the calibration. It's also recommended to consider using an external voltage reference to improve the accuracy of the calibration.
ADS8864IDRCT datasheet
by Texas Instruments
