Omega ISA- BUS MULTI-FUNCTIONAL BOARD OME-A822PG - Manual (Page 33)

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:
z
D/A output register, BASE+4/BASE+5/BASE+6/BASE+7, (sec. 2.4.3)
z JP1 jumper set to internal reference voltage -5V or -10V (sec. 2.3.1)
z JP2 jumper set to internal or external reference voltage (sec. 2.3.2)
z If JP2 is set to internal and JP1 is set to -5V, the D/A output range is 0 to 5V
z If JP2 is set to internal and JP1 is set to -10V, the D/A output range is 0 to 10V
z If JP2 is set to external, the external reference voltage can be AC/DC +/- 10V
The block diagram is given below:
OME-A-822PGL/PGH
D/A channel 0
Base+4/+5
Ref
JP1
JP2 -5/-10 V
Internal
Reference
D/A channel 1
Base+6/+7
Ref
CN3
D0..D7
30
31
32
9,10,14,28,29
Analog
Gnd
V0+ V0-
Vref0+ Vref0-
V1+ V1-
Vref1+
12
Vref1-
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