User`s guide

Installation

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2.11 D/A Reference Voltage Setting

The D/A converter's reference voltage source can be internal or external

generated. The external reference voltage comes from connector CN3 pin

31(ExtRef1) and pin12(ExtRef2), see section 3.1. The reference source of

D/A channel 1 and channel 2 are selected by JP2, respectively. Their

possible settings are shown as below:

D/A CH1 is External

D/A CH2 is External

JP2

INTR EF

ExtRef2

ExtRef1

INTREF

INTR EF INTR EF

INTREF INTREF

INTR EF INTR EF

D/A CH1 is Internal

D/A CH2 is Internal

(default settin g )

D/A CH1 is Internal

D/A CH2 is External

D/A CH1 is External

D/A CH2 is Internal

ExtRef1

ExtRef2

JP2

Figure 2.8 D/A Voltage Setting

The internal voltage is -5V or -10V which can is selected by JP1. The

possible configurations are specified as Figure 2.9. Note that the internal

reference voltage is used only when the JP2 or JP3 is set to internal

reference.