A good PCB layout for the THS4509 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. A 4-layer PCB with a dedicated power plane and a solid ground plane is recommended.
The choice of gain resistors depends on the desired gain and bandwidth of the amplifier. A higher gain resistor value will result in higher gain but may compromise bandwidth. TI provides a gain resistor calculator tool to help with the selection.
The maximum power dissipation of the THS4509 is dependent on the ambient temperature and the thermal resistance of the package. According to the datasheet, the maximum power dissipation is 1.4W at 25°C ambient temperature. However, this can be derated based on the operating temperature and thermal resistance.
Yes, the THS4509 can be used as a single-ended amplifier by tying the negative input to ground and using the positive input as the signal input. However, this will result in a reduced gain and bandwidth compared to differential operation.
The THS4509 has a built-in low-pass filter that can be used to filter out high-frequency noise. Additionally, external filters such as RC filters or ferrite beads can be used to further reduce noise. It's also important to ensure good PCB layout and decoupling to minimize noise coupling.
THS4509QRGTRQ1 datasheet
by Texas Instruments
