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 TLV5638QDRG4 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.
The maximum clock frequency for the TLV5638QDRG4 is 20 MHz, and it determines the conversion rate of the ADC. A higher clock frequency results in a faster conversion rate, but it also increases the power consumption and noise sensitivity of the device.
A differential input configuration can be implemented by connecting the positive input signal to the IN+ pin and the negative input signal to the IN- pin. This configuration provides common-mode noise rejection, which can improve the signal-to-noise ratio (SNR) and overall accuracy of the conversion.
The recommended power-up sequence for the TLV5638QDRG4 is to apply the analog power supply (AVCC) first, followed by the digital power supply (DVCC), and then the clock signal. This sequence is important to ensure that the internal analog and digital circuits are properly initialized and to prevent damage to the device.
TLV5638QDRG4 datasheet
by Texas Instruments
