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AD7715 Datasheet(PDF) 39 Page - Analog Devices

Part # AD7715
Description  16-Bit, Sigma-Delta ADC
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7715 Datasheet(HTML) 39 Page - Analog Devices

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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


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