The recommended layout and routing for the MAX3109ETJ+ involves keeping the analog and digital grounds separate, using a solid ground plane, and minimizing the length of the traces between the MAX3109ETJ+ and the crystal oscillator. Additionally, it is recommended to use a 4-layer PCB with a dedicated power plane and a dedicated ground plane.
To ensure the MAX3109ETJ+ is properly powered, it is recommended to use a clean and stable power supply, with a voltage range of 2.7V to 3.6V. Additionally, it is recommended to use a 10uF capacitor between the VCC pin and the GND pin to filter out any noise on the power supply.
The maximum frequency of the crystal oscillator that can be used with the MAX3109ETJ+ is 24MHz. However, it is recommended to use a crystal oscillator with a frequency of 12MHz or 16MHz for optimal performance.
To configure the MAX3109ETJ+ for UART mode, the UARTEN pin must be tied high, and the MODE pin must be tied low. Additionally, the TX and RX pins must be connected to the UART transmitter and receiver, respectively.
The maximum baud rate supported by the MAX3109ETJ+ is 921.6kbps. However, the actual baud rate supported may be limited by the system clock frequency and the crystal oscillator frequency.
MAX3109ETJ+ datasheet
by Maxim Integrated Products
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