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.
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.
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.
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.
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.
ADS7845E datasheet
by Texas Instruments
