ADS7817E/250 datasheet by Texas Instruments

ADS7817E/250 Frequently Asked Questions (FAQs)

• What is the recommended layout and placement for the ADS7817E/250 to minimize noise and ensure accurate readings?
  Texas Instruments recommends a 4-layer PCB with a solid ground plane, and placing the ADC close to the analog signal source. Additionally, use short and direct traces for the analog input signals, and keep digital signals away from the analog signals. Refer to the TI application note 'PCB Layout Guidelines for ADCs' for more details.
• How do I handle the output data format and byte ordering when using the ADS7817E/250 with a microcontroller?
  The ADS7817E/250 outputs data in a 16-bit, two's complement format. The byte ordering is most significant byte (MSB) first. Ensure that your microcontroller is configured to receive data in this format and byte order to avoid incorrect readings.
• What is the recommended power-up sequence for the ADS7817E/250 to prevent damage or incorrect operation?
  Power up the VCC supply first, followed by the AVCC supply. Then, apply the clock signal and finally, bring the CS pin low to enable the ADC. This sequence ensures that the internal voltage regulators and clock circuitry are properly initialized.
• How do I calibrate the ADS7817E/250 to achieve the best possible accuracy?
  The ADS7817E/250 has an internal calibration circuit that can be used to trim the offset and gain errors. Use the CAL pin to initiate the calibration sequence, and follow the procedure outlined in the datasheet to achieve optimal accuracy.
• What is the maximum sampling rate that can be achieved with the ADS7817E/250, and how does it affect the power consumption?
  The maximum sampling rate of the ADS7817E/250 is 250 kSPS. However, the power consumption increases with the sampling rate. At 250 kSPS, the typical power consumption is around 15 mW. Refer to the datasheet for more information on power consumption vs. sampling rate.