OPA875IDR datasheet by Texas Instruments

OPA875IDR Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal performance of OPA875IDR?
  Texas Instruments recommends a layout with a solid ground plane, short traces, and minimal impedance mismatch to minimize noise and distortion. A 4-layer PCB with a dedicated analog ground plane is recommended.
• How do I ensure stability when using OPA875IDR in a high-gain configuration?
  To ensure stability, use a compensation capacitor (Cc) between the output and the inverting input pins. The value of Cc depends on the gain and bandwidth requirements. TI provides a stability calculator tool to help determine the optimal value of Cc.
• What is the maximum power dissipation of OPA875IDR, and how do I calculate it?
  The maximum power dissipation of OPA875IDR is 1.4W. To calculate it, use the formula: Pd = (Vcc x Icc) + (Vout x Iout), where Vcc is the supply voltage, Icc is the quiescent current, Vout is the output voltage, and Iout is the output current.
• Can I use OPA875IDR in a single-supply configuration, and if so, how?
  Yes, OPA875IDR can be used in a single-supply configuration. To do so, connect the negative supply pin (V-) to a voltage divider that sets the input common-mode voltage to half of the supply voltage. This allows the op-amp to operate with a single supply voltage.
• How do I protect OPA875IDR from input overvoltage conditions?
  Use input protection diodes (e.g., 1N4148) connected between the input pins and the supply rails to clamp the input voltage to the supply voltage. Additionally, use a series resistor to limit the input current.