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AD7715 Datasheet(PDF) 39 Page - Analog Devices |
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AD7715 Datasheet(HTML) 39 Page - Analog Devices |
39 / 41 page ![]() AD7715 Data Sheet Rev. E | Page 38 of 40 SMART TRANSMITTERS Another area where the low power, single supply, three-wire interface capabilities is of benefit is in smart transmitters. Here, the entire smart transmitter must operate from the 4 mA to 20 mA loop. Tolerances in the loop mean that the amount of current available to power the transmitter is as low as 3.5 mA. The AD7715 consumes only 450 μA, leaving 3 mA available for the rest of the transmitter. Figure 17 shows a block diagram of a smart transmitter which includes the AD7715. Not shown in Figure 17 is the isolated power source required to power the front end. INPUT/OUTPUT STAGE SIGNAL CONDITIONER MICROCONTROLLER UNIT *PID *RANGE SETTING *CALIBRATION *LINEARIZATION *OUTPUT CONTROL *SERIAL COMMUNICATION *HART PROTOCOL VOLTAGE REFERENCE MCLK OUT AD7715 ISOLATED SUPPLY ISOLATION BARRIER SENSORS RTD mV ohm TC LOOP RTN MCLK IN COM 3V 4mA TO 20mA DVDD AVDD REF IN AGND DGND ISOLATED GROUND COM 3V MAIN TRANSMITTER ASSEMBLY BANDPASS FILTER WAVEFORM SHAPER HART MODEM BELL 202 DAC VOLTAGE REFERENCE VOLTAGE REGULATOR VCC Figure 17. Smart Transmitter Using the AD7715 |
Similar Part No. - AD7715_17 |
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Similar Description - AD7715_17 |
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