參數(shù)資料
型號(hào)： EVAL-AD7715-5EB
廠商： Analog Devices, Inc.
英文描述： 3 V/5 V, 450 uA 16-Bit, Sigma-Delta ADC
中文描述： 3伏/ 5伏，450微安16位Σ-Δ模數(shù)轉(zhuǎn)換器
文件頁(yè)數(shù)： 29/31頁(yè)
文件大?。?/td> 474K
代理商： EVAL-AD7715-5EB
AD7715
–29–
REV. C
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 AD7715 consumes only 450
μ
A, leaving 3mA available for
the rest of the transmitter. Figure 15 shows a block diagram of a
smart transmitter which includes the AD7715. Not shown in
Figure 15 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
4–20mA
DV
DD
AV
DD
REF IN
AGND
DGND
ISOLATED GROUND
COM
V
CC
3V
MAIN TRANSMITTER ASSEMBLY
BANDPASS
FILTER
WAVEFORM
SHAPER
HART
MODEM
BELL 202
D/A
CONVERTER
VOLTAGE
REFERENCE
VOLTAGE
REGULATOR
Figure 15. Smart Transmitter Using the AD7715
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EVAL-AD7716EB 制造商:Analog Devices 功能描述:LC2MOS 22-BIT DATA ACQUISITION SYSTEM 制造商:Analog Devices 功能描述:EVALUATION BOARD - Bulk
EVAL-AD7716EBZ 制造商:Analog Devices 功能描述:EVAL BRD AD7716 - Bulk
EVAL-AD7718EB 制造商:Analog Devices 功能描述:Evaluation Kit For 8-/10-Channel, Low Voltage, Low Power, Segma-Delta ADCs 制造商:Rochester Electronics LLC 功能描述:EVALUATION BOARD I.C. - Bulk
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EVAL-AD7719EB 制造商:Analog Devices 功能描述:Evaluation Board For Low Voltage, Low Power, Factory-Calibrated 16-/24-Bit Dual-ADC 制造商:Analog Devices 功能描述:EVALUATION BOARD I.C. - Bulk
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