A good PCB layout for the MAX3491ECSD+T involves keeping the analog and digital grounds separate, using a solid ground plane, and placing the device close to the power supply. Additionally, using a shielded cable for the USB connection and keeping the USB traces away from the analog signals can help minimize EMI.
The MAX3491ECSD+T requires a single 3.3V power supply. It's essential to ensure that the power supply is stable and well-regulated. The power sequencing requirement is to power up the device after the power supply has stabilized. A soft-start circuit can be used to ensure a smooth power-up sequence.
The MAX3491ECSD+T has a thermal pad that must be connected to a thermal plane on the PCB to dissipate heat. A thermal interface material (TIM) can be used to improve heat transfer. Additionally, ensuring good airflow around the device and using a heat sink if necessary can help keep the device within its operating temperature range.
To configure the MAX3491ECSD+T for USB 2.0 high-speed operation, the device must be set to high-speed mode by pulling the HS_EN pin high. Additionally, the USB data lines (D+ and D-) must be terminated with 45Ω resistors, and the device must be connected to a USB 2.0-compliant transceiver.
The MAX3491ECSD+T has built-in ESD protection, but it's still essential to follow proper ESD handling procedures during manufacturing and assembly. Additionally, using ESD protection devices on the USB lines and other external interfaces can help protect the device from ESD events.
MAX3491ECSD+T datasheet
by Maxim Integrated Products
