When operating the THS6232RHFEVM in a single-supply configuration, the input common mode must be referenced to mid-supply, ((V+)+(V-))/2. For single-supply operation, the input common mode is not at GND potential.

The THS6232 has an internal common mode buffer (see section Detailed Description: Overview of THS6232 data sheet); this buffer drives the common mode voltage to mid-supply without external circuitry. The input common mode voltage is at the node between R10 and R15 in the THS6232RHFEVM schematic; this node is connected to TP1 as well as GND via R12 by default.

To enable a input common mode of ((V+)+(V-))/2, a board modification is required. Please remove R12 from the bottom side of the PCB: R12 connects the input common mode node, between R10 and R15, to GND. Setting the input common mode to GND for a single supply configuration does not properly operate the amplifier; there is no device output on the THS6232RHFEVM if R12 is populated. The removal of R12 allows the internal common mode buffer circuit to work as intended during single-supply operation.

After removing R12 from the rear of the PCB, follow these steps for single-supply operation:

• Connect both the V- connector and the GND connector to ground; apply the positive supply voltage to V+.
• Optionally, use TP1 (red) to confirm the input common mode is at ((V+)+(V-))/2.