Texas Instruments provides a layout guide in the datasheet, but it's essential to follow additional guidelines: keep analog and digital grounds separate, use a solid ground plane, and route analog signals away from digital signals. Also, use a low-ESR capacitor for the AVDD pin and a 0.1uF capacitor for the DVDD pin.
To minimize power consumption, use the lowest possible clock frequency, disable the internal reference voltage (VREF) when not in use, and consider using the power-down mode (PD pin) when the converter is not actively converting. Additionally, optimize the analog input signal range to reduce the converter's dynamic power consumption.
The ADS8505IBDBRG4 can achieve a maximum sampling rate of 250 kSPS. However, as the sampling rate increases, the converter's noise floor and distortion also increase. To maintain optimal performance, it's essential to balance the sampling rate with the desired signal-to-noise ratio (SNR) and total harmonic distortion (THD).
The ADS8505IBDBRG4 outputs data in a 16-bit, two's complement format. Ensure correct data alignment by configuring the microcontroller or FPGA to receive the data in the correct byte order (MSB or LSB first) and handling the output data as signed integers.
When selecting an external reference voltage, consider the voltage range (2.5V to 5V), noise tolerance, and temperature coefficient. A low-noise, low-drift reference voltage is recommended to ensure accurate conversions. Additionally, ensure the reference voltage is stable and well-regulated to prevent errors in the conversion process.
ADS8505IBDBRG4 datasheet
by Texas Instruments
