Omega OME-A822PG manual D/A Conversion

2.8 D/A Conversion

The OME-A-822PGL/PGH provides two 12 bit D/A converters. Before using the D/A converter function, you should address the following items:

zD/A output register, BASE+4/BASE+5/BASE+6/BASE+7, (sec. 2.4.3)

zJP1 jumper set to internal reference voltage -5V or -10V (sec. 2.3.1)

zJP2 jumper set to internal or external reference voltage (sec. 2.3.2)

zIf JP2 is set to internal and JP1 is set to -5V, the D/A output range is 0 to 5V

zIf JP2 is set to internal and JP1 is set to -10V, the D/A output range is 0 to 10V

zIf JP2 is set to external, the external reference voltage can be AC/DC +/- 10V

The block diagram is given below:

			CN3
	D/A channel 0		V0+	V0-
D0..D7	Base+4/+5		30
		Ref	9,10,14,28,29
-5/-10 V	JP1	Analog	31
		Gnd
Internal	JP2		Vref0+	Vref0-
Reference			Vref1+	Vref1-
		Ref	12
	Base+6/+7		V1+	V1-
	D/A channel 1		32
OME-A-822PGL/PGH

NOTE : The D/A output latch registers use a “double buffer” structure. The user must

send the low byte data first, then send the high byte data. If the user

only sends the high byte, the low byte data will be the previous value.

OME-A-822PGL/PGH Hardware Manual ---- 31