ADS7844EBG4 datasheet by Texas Instruments

ADS7844EBG4 Frequently Asked Questions (FAQs)

• What is the recommended power-up sequence for the ADS7844?
  The recommended power-up sequence is to power up VCC before VREF, and then power up VREF before applying any input signals. This ensures proper internal biasing and prevents any potential latch-up conditions.
• How do I handle the busy signal (BUSY) during conversion?
  The BUSY signal goes high during conversion and remains high until the conversion is complete. The host controller should monitor the BUSY signal and wait for it to go low before initiating the next conversion or accessing the data.
• What is the maximum sampling rate I can achieve with the ADS7844?
  The maximum sampling rate of the ADS7844 is 125 kHz. However, the actual sampling rate may be limited by the system's clock frequency, the conversion time, and the settling time of the analog input signal.
• How do I calibrate the ADS7844 for optimal performance?
  The ADS7844 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 gain and offset errors can be calculated and corrected using the calibration data.
• What is the effect of temperature on the ADS7844's performance?
  The ADS7844's performance is affected by temperature, with changes in gain, offset, and linearity. The device is specified to operate over a temperature range of -40°C to 85°C, and the user should consider these temperature effects when designing their system.