AD7714 Analog Devices, AD7714 Datasheet - Page 38
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AD7714
Manufacturer Part Number
AD7714
Description
Manufacturer
Analog Devices
Datasheet
1.AD7714.pdf
(40 pages)
Specifications of AD7714
Resolution (bits)
24bit
# Chan
5
Sample Rate
19.2kSPS
Interface
Ser,SPI
Analog Input Type
Diff-Bip,Diff-Uni
Ain Range
(2Vref/PGA Gain) p-p,Uni (Vref)/(PGA Gain)
Adc Architecture
Sigma-Delta
Pkg Type
DIP,SOIC,SOP
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AD7714
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.
AMBIENT
SENSOR
TEMP.
SENSORS
ohm
RTD
mV
TC
DV
DD
AD7714
AV
DGND
DD
ISOLATED GROUND
ISOLATED SUPPLY
AGND
REF IN
MCLK
IN
MCLK
OUT
REFERENCE
VOLTAGE
Figure 16. Smart Transmitter Using the AD7714
ISOLATION
BARRIER
MICROCONTROLLER UNIT
*PID
*RANGE SETTING
*CALIBRATION
*LINEARIZATION
*OUTPUT CONTROL
*SERIAL COMMUNICATION
*HART PROTOCOL
–38–
MAIN TRANSMITTER ASSEMBLY
V
The AD7714 consumes only 500 A, leaving 3 mA available for
the rest of the transmitter. Figure 16 shows a block diagram of a
smart transmitter which includes the AD7714. Not shown in
Figure 16 is the isolated power source required to power the
front end.
COM
CC
COM
3V
CONVERTER
BELL 202
MODEM
HART
REFERENCE
D/A
VOLTAGE
WAVEFORM
SHAPER
CONDITIONER
3V
SIGNAL
REGULATOR
INPUT/OUTPUT
VOLTAGE
STAGE
BANDPASS
FILTER
LOOP
RTN
4–20mA
REV. C