Texas Instruments provides a layout guide and PCB design checklist in the ADS8861IDRCR datasheet and application notes. It's essential to follow these guidelines to minimize noise, ensure signal integrity, and achieve optimal performance. Key considerations include keeping analog and digital signals separate, using a solid ground plane, and minimizing trace lengths and vias.
To minimize EMI and RFI, use a low-inductance, low-capacitance PCB design, and consider using a shielded cable or a twisted pair for the digital outputs. Additionally, use a common-mode choke or a ferrite bead to filter the digital outputs, and ensure that the digital output traces are not routed near sensitive analog 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 sequence helps prevent latch-up and ensures proper device operation. It's also essential to ensure that the power supplies are stable and within the recommended voltage range before applying the clock signal.
The ADS8861IDRCR has an internal calibration circuit that can be used to calibrate the device. The calibration process involves applying a known input voltage and then reading the output code. The device can then be calibrated using the internal calibration circuit or through external calibration using a microcontroller or other external device. Refer to the datasheet and application notes for detailed calibration procedures.
The recommended operating temperature range for the ADS8861IDRCR is -40°C to 125°C. Temperature affects the device's performance, with increased temperature resulting in decreased accuracy and increased noise. It's essential to ensure that the device is operated within the recommended temperature range and that proper thermal management is implemented to prevent overheating.
ADS8861IDRCR datasheet
by Texas Instruments
