Texas Instruments recommends a layout that minimizes parasitic inductance and capacitance, with a solid ground plane, and keeping the input and output traces short and separate. A 4-layer PCB with a dedicated analog ground plane is recommended.
To ensure stability, use a compensation capacitor (Cc) between the output and the inverting input, and a series resistor (Rs) at the output. The values of Cc and Rs depend on the gain and frequency of operation. Consult the application notes and TI's SPICE models for guidance.
The maximum power dissipation of OPA691IDBVTG4 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. Ensure that the junction temperature (Tj) does not exceed 150°C.
Yes, OPA691IDBVTG4 can be used in a single-supply configuration, but the input common-mode voltage range is limited. The input voltage should be at least 1.5V above the negative supply rail, and the output voltage swing will be reduced. Consult the datasheet and application notes for more information.
To protect OPA691IDBVTG4 from EMI, use a shielded enclosure, keep the input and output traces short, and use a common-mode choke or ferrite bead on the input and output lines. Additionally, use a low-pass filter or a shielded cable to connect the input signal.
OPA691IDBVTG4 datasheet
by Texas Instruments
