EVAL-CN0240-SDPZ

EVAL-CN0240-SDPZ is a CN0240 circuit evaluation board. The circuit monitors bidirectional current from sources with DC voltages of up to ±270V with less than 1% linearity error. The load current passes through a shunt resistor, which is external to the circuit. The shunt resistor value is chosen so that the shunt voltage is approximately 100mV at maximum load current. The AD629 accurately measures and buffers the small differential shunt voltage while rejecting high common-mode voltages up to 270V. A dual AD8622 amplifies the signal by 100, while the AD8475 attenuates it by 0.4, converts it to differential form, and level-shifts it for the AD7170 sigma-delta ADC. The ADuM5402 provides galvanic isolation for protection and high common-mode voltage isolation, while also supplying isolated +5V power to the circuit. The measurement result from the AD7170 is provided as a digital code utilizing a simple 2-wire, SPI-compatible serial interface.

• Evaluation board connects to SDP-B controller board (EVAL-SDP-CB1Z) through 120-pin connector