ADS7817UB datasheet by Texas Instruments

ADS7817UB Frequently Asked Questions (FAQs)

• What is the recommended layout and placement for the ADS7817UB to minimize noise and ensure accurate conversions?
  Texas Instruments recommends a 4-layer PCB with a solid ground plane, and placing the ADC close to the analog signal source. Decoupling capacitors should be placed as close as possible to the VCC and GND pins. A dedicated analog ground plane is also recommended to reduce noise coupling.
• How do I handle the output data format and byte ordering when using the ADS7817UB with a microcontroller?
  The ADS7817UB outputs data in a 16-bit, two's complement format. The most significant byte (MSB) is output first, followed by the least significant byte (LSB). The user should ensure that their microcontroller is configured to receive data in this format and byte order.
• What is the maximum sampling rate that can be achieved with the ADS7817UB, and how does it affect the power consumption?
  The maximum sampling rate of the ADS7817UB is 250 kSPS. However, the power consumption increases with the sampling rate. At 250 kSPS, the typical power consumption is around 15 mW, while at 10 kSPS, it is around 5 mW.
• How do I calibrate the ADS7817UB to achieve the best possible accuracy?
  The ADS7817UB has an internal calibration circuit that can be used to calibrate the ADC. The user can perform a self-calibration by writing a specific code to the CAL register. Additionally, the user can perform an external calibration by applying a known input voltage and adjusting the offset and gain registers accordingly.
• What is the effect of temperature on the accuracy and performance of the ADS7817UB?
  The ADS7817UB is specified to operate over a temperature range of -40°C to 85°C. The accuracy and performance of the ADC may degrade at extreme temperatures. The user should ensure that the ADC is operated within the specified temperature range and that the system is designed to compensate for any temperature-related errors.