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4.4 D/A Converter Outputs
Figure 31 shows the D/A converter outputs.
User Circuits
DAC
10 k W
1 nF
LM324
AOUT[0,1]
14 k W
133 k W
7.87 k W
33 k W
10 k W
Channels
AOUT[0,1]
BSS138
2N7002
PB[1,3]
PB[0,2]
27 k W
27 k W
+V
+V
AGND
DAC
Channels
AOUT[2,7]
10 k W
1 nF
7.87 k W
LM324
33 k W
AOUT[2,7]
10 k W
AGND
Figure 31. D/A Converter Outputs
The D/A converter outputs are buffered and scaled to provide outputs that are software-
configurable for voltage ranges of 0–10 V and 0–20 V. Channels AOUT0 and AOUT1 can
also be configured in software to provide output ranges of 0–5 V.
NOTE: The D/A converter output voltage depends on the original power-supply voltage,
DCIN, which must be at least 3 V more than the voltage of the D/A converter output.
For example, if AOUT0 is configured for 0–20 V, DCIN must be at least 23 V, other-
wise the maximum D/A converter output will be DCIN – 3 V.
While each D/A converter channel can output up to 10 mA, the total power dissipation by
the LM324 op-amp at any instant must be kept below 400 mW, or (400 mW)/(DCIN × 4)
mA per channel.
The D/A Converter Card outputs can be updated asynchronously as raw data are processed
and written, or they may be updated simultaneously by executing the rn_anaOutStrobe()
function call with the opmode parameter in the rn_anaOutConfig() function call set
for synchronous operation. Further details are provided in Section 4.5.3, “D/A Converter
Card Function Calls.”
88
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