DAC7631 - dreamm
DAC7631 - dreamm
DAC7631 - dreamm
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Figure 16 shows a <strong>DAC7631</strong> in a 4mA to 20mA current<br />
output configuration. The output current can be determined<br />
by Equation 3:<br />
At full-scale, the output current is 16mA, plus the 4mA, for<br />
the zero current. At zero scale the output current is the offset<br />
current of 4mA (0.5V/125Ω).<br />
⎛ V V N V<br />
IOUT = ⎛ 25 . – 05 . ⎞ ⎛ ⎞⎞<br />
⎜⎝<br />
⎠<br />
⎜ ⎟<br />
⎝<br />
⎝ ⎠<br />
⎟ + ⎛ 05 .<br />
•<br />
⎞<br />
125Ω<br />
65,<br />
536 ⎠ ⎝125Ω⎠<br />
(3)<br />
+V<br />
OPA2350<br />
100Ω<br />
2200pF<br />
20kΩ<br />
1000pF<br />
100Ω<br />
80kΩ<br />
+V<br />
+2.5V<br />
1000pF<br />
2200pF<br />
+5V<br />
1<br />
V REF H<br />
V CC<br />
20<br />
+<br />
0.1µF 1µF<br />
2<br />
V REF H Sense<br />
AGND<br />
19<br />
3<br />
V REF L<br />
V SS<br />
18<br />
I OUT<br />
4<br />
V REF L Sense<br />
V OUT Sense<br />
17<br />
Serial Data Out<br />
Serial Data In<br />
Clock<br />
Chip Select<br />
5<br />
6<br />
7<br />
8<br />
9<br />
10<br />
DGND<br />
V DD<br />
SDO<br />
SDI<br />
CLK<br />
CS<br />
<strong>DAC7631</strong><br />
V OUT<br />
NC<br />
RSTSEL<br />
RST<br />
LOAD<br />
LDAC<br />
16<br />
15<br />
14<br />
13<br />
12<br />
11<br />
Reset DAC Registers<br />
Load<br />
Load DAC Registers<br />
V PROGRAMMED<br />
125Ω<br />
FIGURE 16. 4-to-20mA Digitally Controlled Current Source (1/2 <strong>DAC7631</strong>).<br />
®<br />
<strong>DAC7631</strong><br />
18
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