7.3.1 Functional Features

The XTR305 provides two basic functional blocks: an instrumentation amplifier (IA) and a driver that is a unique operational amplifier (OPA) for current or voltage output. This combination represents an analog output stage which can be digitally configured to provide either current or voltage output to the same terminal pin. Alternatively, it can be configured for independent measurement channels.

Three open collector error signals are provided to indicate output related errors such as overcurrent or open-load (EF_LD) or exceeding the common-mode input range at the IA inputs (EF_CM). An overtemperature flag (EF_OT) can be used to control output disable to protect the circuit. The monitor outputs (I_MON and IA_OUT) and the error flags offer optimal testability during operation and configuration. The I_MON output represents the current flowing into the load in voltage output mode, while the IA_OUT represents the voltage across the connectors in current output mode. Both monitor outputs can be connected together when used in current or voltage output mode because the monitor signals are multiplexed accordingly.