CN0218 is a circuit that monitors current in systems with high positive common-mode dc voltages of up to +500 V with less than 0.2% error. The load current passes through a shunt resistor, which is external to the circuit. The circuit is designed for a full-scale shunt voltage of 500 mV at maximum load current Imax.
The AD8212 is a high common-mode voltage, current shunt monitor. It accurately amplifies a small differential input voltage in the presence of large common-mode voltages up to 65 V (>500 V with an external PNP transistor). The AD8605 is a single rail-to-rail input and output, single-supply amplifier. It features very low offset voltage, low input voltage and current noise, and wide signal bandwidth.
The AD7171 is a very low power, 16-bit, analog-to-digital converter (ADC). It contains a precision, 16-bit, Σ-Δ ADC and an on-chip oscillator. The measurement result from AD7171 is provided as a digital code utilizing a simple 2-wire, SPI-compatible serial interface.
ADuM5402 is a quad channel isolator that provides galvanic isolation for the circuit. This is not only for protection but to isolate the downstream circuitry from the high common-mode voltage. In addition to isolating the output data, the digital isolator can also supply isolated +3.3 V for the circuit. ADR381 is precision 2.500 V band gap voltage reference featuring high accuracy, high stability, and low power consumption in a tiny footprint. It is a micropower, low dropout voltage (LDV) device that provides a stable output voltage from supplies as low as 300 mV above the output voltage.
The EVAL-CN0218-SDPZ Board connects to ADI’s System Demonstration Platform (SDP) and is powered by a +6 V supply or +6 V “wall wart”.
Connect the system ground and the PCB isolated ground to guarantee correct voltage levels and operation. Test point 31 and test point 32 give access to the GND_ISO required to properly make this connection.
NOTE: It is recommended that you install the CN0218 Evaluation Software to the default directory path C:\Program Files (x86)\Analog Devices\CN0218\ and all National Instruments products to C:\Program Files\National Instruments\
NOTE: It is recommended that you close all other applications before clicking “Next”. This will make it possible to update relevant system files without having to reboot your computer.
It is recommended that you install the drivers to the default directory path
C:\Program Files\Analog Devices\SDP\Drivers
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