7.4 Device Functional Modes

The three circuit sections of the REF200 are electrically isolated from one another, using a dielectrically-isolated fabrication process. A substrate connection is provided (pin 6), which is isolated from all circuitry. This pin should be connected to a defined circuit potential to assure rated DC performance. The preferred connection is to the most negative constant potential in the system. In most analog systems, this would be –V_S. For best ac performance, leave pin 6 open and leave unused sections unconnected. Figure 10 shows the simplified circuit diagram of the REF200.

Figure 10. Simplified Circuit Diagram