Real Time Devices AD1200 User Manual page 62

D/A Converter Blpolar Catibratlon Table
D/A Bit Welght
ldeal Output Voltage (ln millivolts)
* 5 V 110 v
4095 (Max. Output)
+4997.6 +9995.1
2048
0.0
0.0
1024
-2500.0
s000.0
512
-3750.0
-7500.0
256
-4375.0
-8750.0
128
-4687.5 -9375.0
64
-4843.8 -9687.s
32
-4921.9 -9843.8
1 6
-4960.9
- 9 9 2 1 . 9
8
-4980.5
-9960.9
4
-4990.2
-9980.s
2
-4995.1
-9990.2
1
-4997.6
-9995.1
0
-5000.0
-10000.0
Timer/Counters
4n8254 programmable interval timer provides three 16-bit, 8 MlIz timer/counters for timing and counting
functions such as frequency measurement, event counting, and intemrpts. Two of the timerrcounters are cascaded
and can be used for the pacer clock. The remaining timer/counter is available for your use. Figure 4-3 shows the
timerhounter circuitry.
TO A/O
T R I G G E R
I 200
I/O CONNECTOR
P 2
I
I
I
EXT CLK
I
I
I
I
I
P7
C L K 2
Fig. 4-3 -8254 Programmable IntervalTimer Circuit Block Diagram
etl lrlext crre r
4-25