ADS800U datasheet by Texas Instruments

ADS800U Frequently Asked Questions (FAQs)

• What is the recommended layout and routing for the ADS800U to achieve optimal performance?
  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 power pins.
• How do I handle the clock signal for the ADS800U, and what are the requirements for the clock source?
  The ADS800U requires a clock signal with a frequency range of 10-50 MHz. The clock signal should be a clean, low-jitter signal, and it's recommended to use a clock source with a jitter of less than 100 ps. The clock signal should also be synchronized with the data conversion process.
• What is the recommended power-up sequence for the ADS800U, and how do I handle power-down mode?
  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. For power-down mode, the clock signal should be stopped, followed by the digital power supply, and then the analog power supply.
• How do I calibrate the ADS800U, and what are the calibration requirements?
  The ADS800U has an internal calibration circuit that can be enabled by setting the CAL pin high. The calibration process takes approximately 100 μs, and it's recommended to perform calibration after power-up and after any changes to the analog input range.
• What is the maximum input voltage range for the ADS800U, and how do I handle overvoltage protection?
  The maximum input voltage range for the ADS800U is ±VREF, where VREF is the reference voltage. Overvoltage protection can be achieved by using external clamping diodes or resistors to limit the input voltage to within the specified range.