A good PCB layout for the LMH0302SQ/NOPB involves keeping the input and output traces short and away from each other, using a solid ground plane, and placing decoupling capacitors close to the device. Additionally, using a shielded enclosure and minimizing the number of vias can help reduce EMI.
To ensure proper powering and decoupling, connect the power supply pins (VCC and GND) to a low-impedance power source, and use a 0.1uF decoupling capacitor between VCC and GND, placed as close to the device as possible. Additionally, use a 10uF bulk capacitor on the input power rail to filter out noise.
The maximum cable length supported by the LMH0302SQ/NOPB depends on the specific application and the type of cable used. However, as a general guideline, the device can support cable lengths up to 100 meters (330 feet) for HD-SDI signals and up to 300 meters (1000 feet) for SD-SDI signals, assuming a high-quality coaxial cable with a characteristic impedance of 75 ohms.
To troubleshoot issues with the LMH0302SQ/NOPB, start by checking the power supply and decoupling, ensuring that the device is properly powered and decoupled. Next, verify that the input signal is within the specified range and that the output is properly terminated. Use an oscilloscope to check the signal integrity and look for signs of signal degradation or distortion. If issues persist, check the PCB layout and ensure that it meets the recommended layout guidelines.
Yes, the LMH0302SQ/NOPB can be used in a redundant or redundant/dual configuration to provide increased reliability and fault tolerance. This can be achieved by using multiple devices in parallel, with each device connected to a separate input signal. The outputs of the devices can then be connected to a switch or multiplexer to select the active signal.
LMH0302SQ/NOPB datasheet
by Texas Instruments
