參數(shù)資料
型號(hào): EVAL-AD7714-3EB
廠商: Analog Devices, Inc.
英文描述: 3 V/5 V, CMOS, 500 uA Signal Conditioning ADC
中文描述: 3 V / 5號(hào)第五的CMOS,500微安ADC的信號(hào)調(diào)理
文件頁數(shù): 38/40頁
文件大?。?/td> 306K
代理商: EVAL-AD7714-3EB
AD7714
REV. C
–38–
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 4mA to
20mA loop. Tolerances in the loop mean that the amount of
current available to power the transmitter is as low as 3.5mA.
The AD7714 consumes only 500
μ
A, leaving 3mA 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.
INPUT/OUTPUT
STAGE
SIGNAL
CONDITIONER
VOLTAGE
REFERENCE
MCLK
OUT
AD7714
ISOLATED SUPPLY
ISOLATION
BARRIER
SENSORS
RTD
mV
ohm
TC
LOOP
RTN
MCLK
IN
COM
3V
4–20mA
DV
DD
AMBIENT
TEMP.
SENSOR
AV
DD
REF IN
AGND
DGND
ISOLATED GROUND
COM
V
CC
3V
VOLTAGE
REGULATOR
MAIN TRANSMITTER ASSEMBLY
BANDPASS
FILTER
D/A
CONVERTER
WAVEFORM
SHAPER
HART
MODEM
BELL 202
MICROCONTROLLER UNIT
*PID
*RANGE SETTING
*CALIBRATION
*LINEARIZATION
*OUTPUT CONTROL
*SERIAL COMMUNICATION
*HART PROTOCOL
VOLTAGE
REFERENCE
Figure 16. Smart Transmitter Using the AD7714
相關(guān)PDF資料
PDF描述
EVAL-AD7714-5EB 3 V/5 V, CMOS, 500 uA Signal Conditioning ADC
EVAL-AD7715-3EB 3 V/5 V, 450 uA 16-Bit, Sigma-Delta ADC
EVAL-AD7715-5EB 3 V/5 V, 450 uA 16-Bit, Sigma-Delta ADC
EVAL-AD7716EB Evaluation Board For 22-Bit Data Acquisition System
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EVAL-AD7714-5EB 制造商:Analog Devices 功能描述:EVALUATION BOARD - Bulk
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