參數(shù)資料
型號(hào): AD7715ARU-5REEL
廠商: Analog Devices Inc
文件頁(yè)數(shù): 32/40頁(yè)
文件大?。?/td> 0K
描述: IC ADC 16BIT SIGMA-DELTA 16TSSOP
標(biāo)準(zhǔn)包裝: 2,500
位數(shù): 16
采樣率(每秒): 500
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): 9.5mW
電壓電源: 模擬和數(shù)字
工作溫度: -40°C ~ 85°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 16-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 16-TSSOP
包裝: 帶卷 (TR)
輸入數(shù)目和類(lèi)型: 1 個(gè)差分,單極;1 個(gè)差分,雙極
配用: EVAL-AD7715-3EBZ-ND - BOARD EVALUATION FOR AD7715
AD7715
Rev. D | 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
08
51
9-
0
17
Figure 17. Smart Transmitter Using the AD7715
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