EVAL-CN0185-EB1Z

EVAL-CN0185-EB1Z is a CN0185 circuit evaluation board. The circuit is a complete low-cost implementation of an analogue-to-analogue isolator. The circuit provides isolation of 2500Vrms (1 minute per UL 1577). The circuit is based on the AD7400A, a second-order, sigma-delta (Σ-Δ) modulator with a digitally isolated 1-bit data stream output. The isolated analogue signal is recovered with a fourth-order active filter based on the dual, low noise, rail-to-rail AD8646 op amp. With the ADuM5000 as the power supply for the isolated side, the two sides are completely isolated and use only one power supply for the system. The circuit has 0.05% linearity and benefits from the noise shaping provided by the modulator of the AD7400A and the analogue filter. The applications of the circuit include motor control and shunt current monitoring, and the circuit is also a good alternative to isolation systems based on optoisolators.