DAC7631 - dreamm
DAC7631 - dreamm
DAC7631 - dreamm
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+V<br />
OPA2350<br />
2kΩ<br />
2200pF<br />
100Ω<br />
+2.5V<br />
+0.050V<br />
+V<br />
98kΩ<br />
100Ω<br />
1000pF<br />
1<br />
2<br />
3<br />
4<br />
V REF H <strong>DAC7631</strong><br />
V REF H Sense<br />
V REF L<br />
V REF L Sense<br />
2200pF<br />
1000pF<br />
NOTE: V REF L has been chosen to be 50mV to allow for current sinking voltage<br />
drops across the 100Ω resistor and the output stage of the buffer op amp.<br />
FIGURE 6. Single-supply Buffered Reference, V REF L = 50mV.<br />
LE (LSB)<br />
DLE (LSB)<br />
2.0<br />
1.5<br />
1.0<br />
0.5<br />
0<br />
–0.5<br />
–1.0<br />
–1.5<br />
–2.0<br />
LINEARITY ERROR AND<br />
DIFFERENTIAL LINEARITY ERROR vs CODE<br />
(DAC A, +25°C)<br />
2.0<br />
1.5<br />
1.0<br />
0.5<br />
0<br />
–0.5<br />
–1.0<br />
–1.5<br />
–2.0<br />
0000 H 2000 H 4000 H 6000 H 8000 H<br />
Digital Input Code<br />
LE (LSB)<br />
DLE (LSB)<br />
LINEARITY ERROR AND<br />
DIFFERENTIAL LINEARITY ERROR vs CODE<br />
(DAC A, +25°C)<br />
2.0<br />
1.5<br />
1.0<br />
0.5<br />
0<br />
–0.5<br />
–1.0<br />
–1.5<br />
–2.0<br />
2.0<br />
1.5<br />
1.0<br />
0.5<br />
0<br />
–0.5<br />
–1.0<br />
–1.5<br />
–2.0<br />
A000 H C000 H E000 H FFFF H 0000 H 2000 H 4000 H 6000 H 8000 H A000 H C000 H E000 H FFFF H<br />
Digital Input Code<br />
FIGURE 7. Integral Linearity and Differential Linearity<br />
Error Curves for Figure 6.<br />
FIGURE 8. Integral Linearity and Differential Linearity<br />
Error Curves for Figure 9.<br />
+V<br />
+V<br />
OPA2350<br />
+1.25V<br />
2200pF<br />
100Ω<br />
+V<br />
100Ω<br />
1000pF<br />
1<br />
2<br />
3<br />
4<br />
V REF<br />
H <strong>DAC7631</strong><br />
V REF<br />
H Sense<br />
V REF<br />
L<br />
V REF<br />
L Sense<br />
+2.5V<br />
2200pF<br />
1000pF<br />
FIGURE 9. Single-supply Buffered Reference, V REF L = +1.25V, V REF H = –1.25V.<br />
®<br />
<strong>DAC7631</strong><br />
14