Figure 8-6 is a typical configuration for creating an external trigger on oscilliscopes. The user adjusts the trigger level, and a DAC converts this trigger level to a voltage the TLV380x/TLV3811(C) can use as a reference. The input voltage from an oscilloscope channel is then compared to the trigger reference voltage, and the TLV380x/TLV3811(C) sends an LVDS signal to a downstream FPGA to begin a capture. It is common to see bipolar inputs in test and measurement systems such as oscilloscopes; therefore, the TLV380x can be configured in split supply so that the inputs are in the allowable input voltage range.

Figure 8-6 External Trigger Function