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參數資料
型號: AD7719BRU
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: Low Voltage, Low Power, Factory-Calibrated 16-/24-Bit Dual ADC
中文描述: 6-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28
封裝: MS-153AE, TSSOP-28
文件頁數: 39/40頁
文件大小: 367K
代理商: AD7719BRU
REV. 0
AD7719
–39–
Smart Transmitters
Smart transmitters are another key design-in area for the AD7719.
The dual sigma-delta converter, single supply operation, 3-wire
interface capabilities, and small package size are all 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 trans-
mitter is as low as 3.5 mA. Figure 24 shows a block diagram of a
smart transmitter which includes the AD7719.
MICROCONTROLLER
REF OUT2
REF IN
10 F
0.1 F
AV
DD
DV
DD
AIN1
AIN2
CS
DOUT
SCLK
DIN
DGND
AGND
AIN5
AIN5 COM
REFIN2
REFIN(+)
REFIN(
)
0.1 F
REF OUT1
CLOCK
LATCH
DATA
4.7 F
COM
C1
C2
C3
V
CC
GND
AD7719
AD421
BOOST V
CC
LV
0.01 F
1k
1000pF
LOOP
POWER
10 F
3.3V
1.25V
DN25D
0.01 F
LOOP
RTN
COMP
DRIVE
MAIN
VARIABLES
SECONDARY
VARIABLES
AIN3
AIN4
Figure 24. Smart Transmitter Employing the AD7719
Not shown in Figure 24 is the isolated power source required to
power the front end. The advantages of the AD7719 in these
applications is the dual channel operation, meaning that the
user does not have to interrupt the main channel when measur-
ing secondary variables, and therefore does not have the latency
associated with the settling times of the digital filter. The fact
that the AD7719 is factory-calibrated means that in the majority
of applications, the user will not have to perform any field cali-
bration given the excellent offset and gain drift performance of
the device as a result of the signal chain chopping employed in
the signal chain.
相關PDF資料
PDF描述
AD7719 Low Voltage, Low Power, Factory-Calibrated 16-/24-Bit Dual ADC
AD7719BR Low Voltage, Low Power, Factory-Calibrated 16-/24-Bit Dual ADC
AD7720 CMOS Sigma-Delta Modulator
AD7720BRU CMOS Sigma-Delta Modulator
AD7721 CMOS 16-Bit, 468.75 kHz, Sigma-Delta ADC
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