500-003111-000
4-18
Table 4.7.1-1. DAC Data Format and Coding
DAC DATA FORMAT
MSB
D15 D14
D13 D12
D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
DAC CODING
UNIPOLAR RANGES
STRAIGHT BINARY
OUTPUT
0 TO +10 V
0 TO +5 V
D15
D0
+FS-1 LSB
+1/2 FS
+1 LSB
+9.9975 V
+5.0000 V
+0.0024 V
+4.9988 V
+2.5000 V
+0.0012 V
XXXX
XXXX
XXXX
1111
1000
0000
1111
0000
0000
1111
0000
0001
BIPOLAR RANGES
OFFSET BINARY
OUTPUT
±
10 V
±
5 V
D15
D0
+FS-1 LSB
+1/2 FS
+1 LSB
ZERO
-FS+1 LSB
-FS
+9.9951 V
+5.0000 V
+0.0049 V
+0.0000 V
-9.9951 V
-10.0000 V
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
1111
1100
0000
1000
0000
0000
1111
0000
0000
0000
0000
0000
1111
0000
0001
0000
0001
0000
+4.9976 V
+2.5000 V
+0.0024 V
0.0000 V
-4.9976 V
-5.0000 V
M3111/T4.7.1-1
x = "Don't care."
4.7.2 Off-Line
Operation
Setting the OUTPUT ON-LINE control bit HIGH (Table 4.2-1) connects
the analog outputs to the P2 I/O connector for normal system cooperation. Clearing
the bit LOW disconnects the analog outputs from P2. However, the output buffers
can still be monitored through the self-test multiplexers.
4.8
SELF-TESTING THE VMIVME-3111 BOARD
Built-in-Test (BIT) provisions include loopback testing and the
measurement of analog input offset voltages and on-board precision reference
voltages. These capabilities permit self-contained, board-level verification of
performance.
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