Texas Instruments recommends a star-ground layout, where the op-amp's ground pin is connected to a central ground point, and all other components are connected to this point through separate traces. This helps to reduce noise and parasitic capacitance.
The output capacitor should be chosen based on the desired closed-loop bandwidth and stability requirements. A general rule of thumb is to use a capacitor with a value between 10nF to 100nF, and a voltage rating that exceeds the maximum output voltage of the op-amp.
Yes, the OPA615IDR can be used as a unity-gain buffer, but it's not recommended due to its high gain-bandwidth product. This can lead to oscillations and instability. Instead, consider using a dedicated unity-gain buffer op-amp like the OPA633 or OPA634.
The input bias current of the OPA615IDR is typically around 10pA. To minimize its effect, use a high-impedance input source, and consider adding a bias current compensation network, such as a resistor and capacitor in series, to the input pins.
The maximum power dissipation of the OPA615IDR is dependent on the ambient temperature and the package type. For the SOIC package, the maximum power dissipation is around 1.4W at 25°C. However, it's recommended to derate the power dissipation based on the operating temperature and other environmental factors.
OPA615IDR datasheet
by Texas Instruments
