To maximize the performance of the DACx750 in any application, good layout practices and proper circuit design must be followed. A few recommendations specific to the DACx750 are:
- As illustrated in Figure 9-1, CAP2 is directly connected to the input of the final IOUT amplifier. Any
noise or unwanted ac signal routed near the CAP1 and CAP2 pins could
capacitively couple onto internal nodes and affect IOUT. Therefore, make sure to
avoid routing any digital or HART signal traces over the CAP1 and CAP2
traces.
- Connect the thermal PAD to the lowest potential in the system.
- Make sure that AVDD has decoupling capacitors
local to the respective pins.
- Place the reference capacitor close to the
reference input pin.
- Avoid routing switching signals near the reference input.
- For designs that include protection circuits:
- Place diversion elements, such as TVS diodes or capacitors, close to off-board connectors to make sure that return current from high-energy transients does not cause damage to sensitive devices.
- Use large, wide traces to provide a low-impedance
path to divert high-energy transients away from I/O pins.