5.36 12-Bit DAC, Reference Input Specifications
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
| PARAMETER |
TEST CONDITIONS |
VCC |
MIN |
TYP |
MAX |
UNIT |
| VeREF+ |
Reference input voltage range |
DAC12IR = 0(1)(2) |
2.2 V, 3 V |
|
AVCC/3 |
AVCC + 0.2 |
V |
| DAC12IR = 1(3)(4) |
|
AVCC |
AVCC + 0.2 |
Ri(VREF+),
(Ri(VeREF+) |
Reference input resistance |
DAC12_0 IR = DAC12_1 IR = 0 |
2.2 V, 3 V |
20 |
|
|
MΩ |
| DAC12_0 IR = 1, DAC12_1 IR = 0 |
40 |
48 |
56 |
kΩ |
| DAC12_0 IR = 0, DAC12_1 IR = 1 |
DAC12_0 IR = DAC12_1 IR = 1,
DAC12_0 SREFx = DAC12_1 SREFx(5) |
20 |
24 |
28 |
(1) For a full-scale output, the reference input voltage can be as high as 1/3 of the maximum output voltage swing (AVCC).
(2) The maximum voltage applied at reference input voltage terminal VeREF+ = [AVCC – VE(O)] / [3 × (1 + EG)].
(3) For a full-scale output, the reference input voltage can be as high as the maximum output voltage swing (AVCC).
(4) The maximum voltage applied at reference input voltage terminal VeREF+ = [AVCC – VE(O)] / (1 + EG).
(5) When DAC12IR = 1 and DAC12SREFx = 0 or 1 for both channels, the reference input resistive dividers for each DAC are in parallel reducing the reference input resistance.