Texas Instruments provides a layout and routing guide in the application note SLAA554, which recommends keeping the analog and digital grounds separate, using a star-ground configuration, and minimizing trace lengths and loops to reduce noise and electromagnetic interference (EMI).
The internal reference voltage of the TLV5638QDG4 is 2.5V, and it is recommended to use this internal reference for most applications. However, if an external reference voltage is required, it can be connected to the REF pin, but it must be within the specified range of 2.4V to 2.6V, and the internal reference must be disabled by connecting the REFIN pin to GND.
The maximum clock frequency for the TLV5638QDG4 is 20 MHz, and it determines the maximum conversion rate of the ADC. The conversion rate is equal to the clock frequency divided by 24, so a 20 MHz clock frequency would result in a maximum conversion rate of approximately 833 kHz.
The TLV5638QDG4 has a built-in POR and BOR circuitry that resets the device during power-up or brown-out conditions. The POR threshold is typically 1.8V, and the BOR threshold is typically 1.6V. To handle these features, ensure that the power supply voltage rises monotonically during power-up, and consider adding external circuitry to filter out noise and glitches on the power supply line.
To synchronize multiple TLV5638QDG4 devices, connect the SYNC pin of each device to a common clock signal, and ensure that the clock signal is distributed equally to each device. Additionally, consider using a common reference voltage and ensuring that the devices are properly aligned and synchronized during power-up.
TLV5638QDG4 datasheet
by Texas Instruments
