ADS7845E datasheet by Texas Instruments

ADS7845E Frequently Asked Questions (FAQs)

• What is the recommended power-up sequence for the ADS7845E?
  The recommended power-up sequence is to apply VCC first, followed by VREF, and then the analog input signal. This ensures proper operation and prevents damage to the device.
• How do I optimize the ADC's performance for my specific application?
  To optimize the ADC's performance, consider the following: use a low-noise power supply, minimize digital noise, use a high-quality analog input signal, and optimize the sampling rate and clock frequency for your specific application.
• What is the maximum sampling rate I can achieve with the ADS7845E?
  The maximum sampling rate of the ADS7845E is 200 kHz. However, the actual achievable sampling rate may be limited by the system's clock frequency, analog input signal quality, and other factors.
• How do I handle the ADS7845E's digital output data?
  The ADS7845E outputs 12-bit digital data in a serial format. You can use a microcontroller or FPGA to receive and process the data. Ensure proper synchronization and data formatting to avoid errors.
• What is the purpose of the VREF pin, and how do I use it?
  The VREF pin sets the reference voltage for the ADC. Connect a stable voltage source (e.g., 2.5V or 3.3V) to VREF to set the full-scale range of the ADC. This allows you to adjust the ADC's input range to match your application's requirements.