REF200AU datasheet by Texas Instruments

REF200AU Frequently Asked Questions (FAQs)

• What is the recommended layout and placement for the REF200AU to minimize noise and ensure accurate voltage reference?
  The REF200AU should be placed close to the analog-to-digital converter (ADC) or digital-to-analog converter (DAC) it is referencing, with a low-impedance connection to the analog ground plane. The device should be oriented to minimize noise coupling, and a decoupling capacitor (e.g., 10nF) should be placed as close as possible to the device.
• How do I ensure the REF200AU is properly powered and what are the power supply requirements?
  The REF200AU requires a stable power supply with a voltage range of 4.5V to 36V. A decoupling capacitor (e.g., 10uF) should be placed between the power supply pins (VCC and GND) to filter out noise. Additionally, the power supply should be able to provide a minimum of 1mA of current to ensure proper operation.
• What is the temperature range for the REF200AU and how does it affect the voltage reference output?
  The REF200AU operates over a temperature range of -40°C to 125°C. The voltage reference output has a temperature coefficient of ±10ppm/°C, which means the output voltage will vary by ±10ppm for every 1°C change in temperature. This can be compensated for by using temperature compensation circuits or by using a temperature-stable voltage reference.
• How do I calculate the output impedance of the REF200AU and what are the implications for my design?
  The output impedance of the REF200AU is typically around 0.2Ω. This can affect the accuracy of the voltage reference output, especially when driving high-impedance loads. To minimize the impact, it's recommended to buffer the output with an op-amp or use a low-impedance load.
• What are the EMI and RFI considerations for the REF200AU and how can I minimize their impact?
  The REF200AU is susceptible to electromagnetic interference (EMI) and radio-frequency interference (RFI). To minimize their impact, use a shielded enclosure, keep the device away from high-frequency sources, and use a low-pass filter or ferrite bead to filter out high-frequency noise.