ADS7890IPFBT datasheet by Texas Instruments

ADS7890IPFBT Frequently Asked Questions (FAQs)

• What is the recommended layout and routing for the ADS7890IPFBT to minimize noise and ensure accurate conversions?
  Texas Instruments provides a layout and routing guide in the application note SLAA384, which recommends keeping the analog and digital grounds separate, using a solid ground plane, and minimizing the length of the analog input traces.
• How do I handle the high-speed clock signal to the ADS7890IPFBT to avoid signal integrity issues?
  The clock signal should be routed as a differential pair, and the trace length should be matched to minimize skew. Additionally, the clock signal should be terminated with a 50-ohm resistor to match the impedance of the PCB trace.
• What is the recommended power-up sequence for the ADS7890IPFBT to ensure proper operation?
  The recommended power-up sequence is to power up the analog supply (AVDD) first, followed by the digital supply (DVDD), and then the clock signal. This ensures that the analog circuitry is powered up before the digital circuitry.
• How do I calibrate the ADS7890IPFBT to achieve the highest accuracy?
  The ADS7890IPFBT 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 calibration data can then be used to correct for any offset or gain errors.
• What is the maximum sampling rate that can be achieved with the ADS7890IPFBT, and how does it affect the power consumption?
  The maximum sampling rate of the ADS7890IPFBT is 1 MSPS. However, the power consumption increases with the sampling rate, so it's recommended to use the lowest sampling rate necessary for the application to minimize power consumption.