參數(shù)資料
型號: AD7714ARZ-3REEL
廠商: Analog Devices Inc
文件頁數(shù): 32/40頁
文件大?。?/td> 0K
描述: IC ADC 24BIT SIGMA-DELTA 24SOIC
標(biāo)準(zhǔn)包裝: 1,000
位數(shù): 24
采樣率(每秒): 1k
數(shù)據(jù)接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 7mW
電壓電源: 模擬和數(shù)字
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 24-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 24-SOIC W
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 3 個差分,單極;3 個差分,雙極;5 個偽差分,單極;5 個偽差分,雙極
配用: EVAL-AD7714-3EBZ-ND - BOARD EVAL FOR AD7714
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 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 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.
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
DVDD
AMBIENT
TEMP.
SENSOR
AVDD
REF IN
AGND
DGND
ISOLATED GROUND
COM
VCC
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
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