Texas Instruments recommends a 4-layer PCB with a solid ground plane, and to keep the analog and digital signals separate. Additionally, use short and direct traces for the analog inputs, and avoid running digital signals near the analog inputs. Refer to the TI application note 'PCB Layout Guidelines for ADCs' for more details.
The internal reference voltage can be configured using the REFSEL pin. Connect REFSEL to VDD to use the internal 2.5V reference, or connect it to an external reference voltage source. Ensure the reference voltage is stable and within the recommended range (1.8V to 3.6V) for optimal performance.
The ADC3421IRTQR can achieve a maximum sampling rate of 1.5 MSPS. To configure the sampling rate, use the SCLK pin to clock the ADC at the desired rate. The sampling rate can be calculated using the formula: Sampling Rate = SCLK Frequency / (2 * (1 + OSR)), where OSR is the oversampling ratio.
The ADC3421IRTQR outputs 14-bit or 16-bit data, depending on the mode selected. The output data format is twos complement, and the word length can be configured using the MODE pin. Ensure your microcontroller or processor can handle the selected word length and data format.
The ADC3421IRTQR's power consumption is typically around 15 mW at 1.5 MSPS. To reduce power consumption, consider using the power-down mode (PD pin), reducing the sampling rate, or operating the ADC at a lower supply voltage (down to 1.8V).
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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.
