OPA691IDBVT datasheet by Texas Instruments

OPA691IDBVT Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal performance of OPA691IDBVT?
  A good PCB layout for OPA691IDBVT 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 ground plane is recommended.
• How do I ensure stability when using OPA691IDBVT in a high-gain configuration?
  To ensure stability in high-gain configurations, it's essential to use a compensation capacitor (Cc) between the output and the inverting input. The value of Cc depends on the gain and bandwidth requirements. A good starting point is 2-5 pF.
• What is the maximum power dissipation of OPA691IDBVT, and how do I calculate it?
  The maximum power dissipation of OPA691IDBVT is 1.4 W. To calculate the power dissipation, 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 OPA691IDBVT in a single-supply configuration, and if so, how?
  Yes, OPA691IDBVT can be used in a single-supply configuration. To do so, connect the negative supply pin to a voltage divider that sets the midpoint of the supply voltage. This allows the output to swing close to the negative rail.
• How do I protect OPA691IDBVT from input overvoltage?
  To protect OPA691IDBVT from input overvoltage, use input clamping diodes (e.g., 1N4148) connected between the input pins and the supply rails. This prevents the input voltage from exceeding the maximum rating.