ADLINK PCM-9112+ - Manual (Page 5)

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2.5.3 D/A Reference Voltage External/Internal Setting
The D/A converter’s reference voltage source can be supplied either by internal or external sources.
For external reference voltage, pin 3 (ExtRef1) and 4 (ExtRef2) of connector CN2 are used.
Reference voltage source for D/A of channel 1 and 2 are selected by JP4. Possible settings are
shown below:
D/A Reference Voltage Setting
D/A CH1 is external
D/A CH2 is external
D/A CH1 is external
D/A CH2 is internal
D/A CH1 is internal
D/A CH2 is external
D/A CH1 is internal
D/A CH2 is internal
Table 5: D/A reference voltage setting