Texas Instruments provides a recommended layout and routing guide in the ADS8881IDGSR Evaluation Module User's Guide (SLAU445). It's essential to follow this guide to minimize noise, ensure proper signal integrity, and achieve the best possible performance from the device.
To handle the high-speed digital outputs, use a low-impedance transmission line, keep the output traces short, and use a termination resistor (e.g., 50 ohms) to match the impedance of the transmission line. Additionally, use a low-jitter clock source and ensure proper signal termination to prevent signal reflection and degradation.
The recommended power-up sequence is to first apply the analog supply voltage (AVDD) and then the digital supply voltage (DVDD). This sequence ensures that the internal analog circuits are powered up before the digital circuits, preventing any potential damage or malfunction.
To optimize performance in a noisy environment, use proper shielding, grounding, and decoupling techniques. Ensure that the analog and digital grounds are separated and connected at a single point. Use a low-pass filter or a ferrite bead to filter out high-frequency noise on the power supply lines. Additionally, consider using a shielded enclosure or a metal can to reduce electromagnetic interference (EMI).
The maximum clock frequency that can be used with the ADS8881IDGSR is 50 MHz. However, the actual clock frequency may be limited by the specific application, the quality of the clock source, and the signal integrity of the clock signal.
ADS8881IDGSR datasheet
by Texas Instruments
Findchips
