PGA205AU datasheet by Texas Instruments

PGA205AU Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal performance?
  A 4-layer PCB with a solid ground plane and a separate analog and digital power plane is recommended. Keep the analog and digital components separate and use a star-grounding scheme to minimize noise.
• How do I optimize the gain and offset calibration?
  Use a calibration routine that writes to the internal registers to set the gain and offset. The PGA205AU has a built-in calibration engine that can be used to optimize the gain and offset. Refer to the application note for more details.
• What is the maximum input voltage that can be applied to the device?
  The maximum input voltage is 5.5V, but it's recommended to keep the input voltage below 5V to ensure reliable operation and to prevent damage to the device.
• How do I handle ESD protection for the device?
  Use ESD protection diodes on the input pins and follow proper PCB design guidelines to minimize ESD risks. The PGA205AU has internal ESD protection, but external protection is still recommended.
• What is the recommended power-up sequence for the device?
  Power up the device in the following sequence: AVDD, DVDD, and then the analog input signal. This ensures that the internal biasing and reference circuits are properly initialized.