PERFORMANCE
Copyright 2001
4-6
DAC128V HARDWARE REFERENCE
4.5 Maximum Loads
The specification sheet for the DACs used on the DAC128V cites that the maximum
current output for all analog channels is ±5 mA. However, a curve near the end of the
data sheet presents information that indicates that the maximum capacity should be
slightly over ±20 mA per channel. Two separate experiments were conducted to clarify
the apparent discharging. To be safe, use ±5 mA as the typical peak loads, with
confidence in knowing that you can get almost ±20 mA out if required.
The system configuration used to develop Table 4-3 is the same as that depicted in Figure
4-1. A 200.7
Ω
resistor was placed, as a load to DAC01, across pins 2 and 3. DAC02 was
left unloaded and was monitored at pin 6 of the I/O termination block. The DACs were
run from ±15 V external supplies with their ranges set to ±10 V full scale.
Table 4-3 Fixed Overloads
Code
DAC02 Vout
DAC01 Vout
DAC01 Iout
Comments
0x000
-10.00 V
-4.15 V
20.7 mA
0x200
-7.50 V
-4.15 V
20.7 mA
Flatlined
0x400
-5.00 V
-4.15 V
20.7 mA
overcurrent
0x480
-4.37 V
-4.14 V
20.6 mA
condition
0x4C0
-4.06 V
-4.05 V
20.2 mA
0x500
-3.74 V
-3.73 V
18.6 mA
0x600
-2.50 V
-2.494 V
12.4 mA
0x700
-1.25 V
-1.247 V
6.2 mA
0xFFF
+9.99 V
+4.26 V
21.2 mA
0xF00
+8.75 V
+4.25 V
21.2 mA
Flatlined
0xE00
+7.50 V
+4.25 V
21.2 mA
overcurrent
0xD00
+6.25 V
+4.25 V
21.2 mA
condition
0xC00
+5.00 V
+4.25 V
21.2 mA
0xB40
+4.06 V
+4.05 V
20.2 mA
0xB00
+3.75 V
+3.74 V
18.6 mA
0xA00
+2.50 V
+2.493 V
12.4 mA
0x900
+1.25 V
+1.246 V
6.2 mA
0x880
+0.624 V
+0.623 V
3.1 mA
0x800
-0.30 mV
0.00 V
—
-10
-5
0
5
10
15
20
25
DAC02 Vout
DAC01 Vout
DAC01 Iout (mA)
Figure 4-4 Flatlined Overcurrent Condition Chart
}
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Содержание DAC128V
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