OPA680P datasheet by Texas Instruments

OPA680P Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal performance of OPA680P?
  Texas Instruments recommends a layout that minimizes parasitic capacitance and inductance, with a solid ground plane and short traces. A 4-layer PCB with a dedicated analog ground plane is recommended. See the TI application note 'AN-202' for more details.
• How do I choose the right output filter for OPA680P?
  The output filter should be chosen based on the desired frequency response and noise rejection. A 2nd-order Butterworth filter with a cutoff frequency of 10-20 times the signal bandwidth is a good starting point. The filter components should be chosen to minimize parasitic effects and ensure stability.
• What is the maximum power dissipation of OPA680P?
  The maximum power dissipation of OPA680P is dependent on the ambient temperature and the thermal resistance of the package. For the DIP package, the maximum power dissipation is 1.4W at 25°C ambient temperature. For the SOIC package, it is 1.1W. See the datasheet for more details.
• Can I use OPA680P as a unity-gain buffer?
  Yes, OPA680P can be used as a unity-gain buffer, but it's not the recommended configuration. The op-amp is optimized for high-gain applications, and using it as a unity-gain buffer may result in reduced stability and increased noise. If a unity-gain buffer is required, consider using a different op-amp, such as the OPA827.
• How do I ensure stability of OPA680P in my circuit?
  To ensure stability, ensure that the circuit meets the recommended gain and phase margin requirements. A minimum gain of 5 is recommended, and the phase margin should be at least 45°. Additionally, ensure that the output is properly terminated, and the input is properly biased.