The recommended PCB layout for the MAX921CSA-T involves keeping the analog and digital grounds separate, using a solid ground plane, and minimizing the length of the traces between the device and the capacitors. Additionally, it's recommended to use a 4-layer PCB with a dedicated power plane and a dedicated ground plane.
The value of the bypass capacitor (CBYP) depends on the specific application and the desired level of noise filtering. A general rule of thumb is to use a capacitor with a value between 0.1uF and 1uF, with a voltage rating that matches the supply voltage. It's also important to consider the ESR (Equivalent Series Resistance) of the capacitor, as it can affect the overall performance of the device.
The MAX921CSA-T is rated for operation over the extended temperature range of -40°C to +125°C. However, it's important to note that the device's performance may degrade at higher temperatures, and the maximum junction temperature should not exceed 150°C.
To ensure proper power-up and initialization, it's recommended to follow a specific power-up sequence, which involves applying the power supply voltage (VCC) before the input signal. Additionally, the device requires a minimum of 1ms of power-up time to allow the internal voltage regulators to stabilize.
The recommended input signal amplitude for the MAX921CSA-T is between 100mV and 5V, with a maximum frequency range of up to 100MHz. However, the specific input signal requirements may vary depending on the application and the desired level of performance.
MAX921CSA-T datasheet
by Maxim Integrated Products
