I'd like to drive four resistive heaters with the AD5686. The application requires sourcing up to 35mA continuously on all four channels at voltages that vary between 1.5 V and 2.5 V.
Fig. 24 suggests that this is possible with a supply voltage of 5V, but there is not a lot of (head)room for error. On the other hand current limiting above 40 mA is a desirable safety feature.
- Would you recommend the AD5686 for this application?
- Should I expect the shoulder of the curve on fig. 24 to shift significantly with temperature or from chip to chip?
- For a given voltage Vout < Vref, does the choice of gain = 1 or gain = 2 impact the current sourcing capabilities at Vout?