Complete 4 mA to 20 mA HART Solution with Additional Voltage Output Capability

By Analog Devices
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The circuit shown in Figure 1 uses the AD5700, the industry’s lowest power and smallest footprint HART®1-compliant IC modem, and the AD5422, a 16-bit current output and voltage output DAC, to form a complete HART-compatible 4 mA to 20 mA solution. The use of the OP184 in the circuit allows the IOUT and VOUT pins to be shorted together, thus reducing the number of screw connections required in programmable logic control (PLC) module applications. For additional space savings, the AD5700-1 offers a 0.5% precision nternal oscillator. Read More

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