Texas Instruments recommends a 4-layer PCB with a solid ground plane, and to keep the analog and digital signals separate. The analog input traces should be short and direct, and the digital output traces should be routed away from the analog inputs. Additionally, decoupling capacitors should be placed close to the device's power pins.
The ADS7817EC/250 has a built-in POR circuit that resets the device when the power supply voltage rises above 1.5V. To ensure proper operation, the power supply voltage should be ramped up slowly (less than 10ms) and the digital interface should be held in a reset state until the power supply is stable. The recommended power-up sequence is to apply the power supply voltage, then the clock signal, and finally the CS signal.
The maximum sampling rate of the ADS7817EC/250 is 250kSPS. However, the actual sampling rate may be limited by the device's power consumption, which increases with the sampling rate. At maximum sampling rate, the device's power consumption is approximately 15mW. To reduce power consumption, the sampling rate can be reduced or the device can be operated in a low-power mode.
The ADS7817EC/250 does not require calibration, as it has an internal calibration circuit that ensures accurate conversions. However, the device's performance can be affected by external factors such as temperature and supply voltage. To ensure optimal performance, Texas Instruments recommends that the device be operated within its specified operating conditions and that the analog input signals be properly filtered and buffered.
The ADS7817EC/250 has a latency of approximately 1.5 clock cycles, which means that the device requires 1.5 clock cycles to complete a conversion and make the result available on the digital output. This latency should be taken into account when designing the system's timing and synchronization.
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About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.
