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 routed close to the AGND plane, and the digital output traces should be routed away from the analog inputs. Additionally, decoupling capacitors should be placed close to the device.
The ADS7955QDBTRQ1 has an internal calibration circuit that is enabled by default. However, it's recommended to perform an external calibration using an external voltage reference and a calibration resistor to ensure optimal performance. The calibration procedure is outlined in the datasheet.
The maximum sampling rate of the ADS7955QDBTRQ1 is 2 MSPS. However, the power consumption increases with the sampling rate. At 2 MSPS, the power consumption is approximately 35 mW. Reducing the sampling rate can help reduce power consumption, but it may also affect the accuracy of the conversions.
The ADS7955QDBTRQ1 outputs 16-bit digital data in a serial format. The output data is in two's complement format, with the most significant bit (MSB) first. The data is output on the DOUT pin, and the clock signal is output on the SCLK pin. The data is valid on the rising edge of the SCLK signal.
The recommended power-up sequence is to apply the analog power supply (AVDD) first, followed by the digital power supply (DVDD). During power-down, the sequence should be reversed. This ensures that the internal voltage regulators are properly shut down to prevent damage to the device.
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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.
