The maximum power dissipation of the LMH6643MA is 1.4W, which is calculated based on the maximum junction temperature (TJ) of 150°C and the thermal resistance (θJA) of 57.1°C/W.
Yes, the LMH6643MA can be used as a unity gain buffer. It has a high input impedance and a low output impedance, making it suitable for buffering applications. However, it's essential to ensure that the input signal is within the common-mode input voltage range.
To minimize noise and oscillations, it's recommended to follow good PCB layout practices, such as keeping the input and output traces separate, using a solid ground plane, and placing decoupling capacitors close to the op-amp. Additionally, ensure that the power supply lines are well-filtered and decoupled.
The recommended decoupling capacitor value for the LMH6643MA is 0.1μF to 1μF, depending on the specific application and frequency range. A higher value capacitor can help to filter out high-frequency noise, but may increase the risk of oscillations.
The LMH6643MA is rated for operation up to 125°C, but its performance may degrade at higher temperatures. If you need to operate the device in a high-temperature environment, ensure that you provide adequate heat sinking and follow the recommended thermal design guidelines.
LMH6643MA/NOPB datasheet
by Texas Instruments
