參數(shù)資料
型號: AD7712EB
廠商: Analog Devices, Inc.
英文描述: LC 2 MOS Signal Conditioning ADC(229.08 k)
中文描述: 立法會二馬鞍山信號調理模數(shù)轉換器(229.08十一)
文件頁數(shù): 27/28頁
文件大小: 229K
代理商: AD7712EB
2
–27–
REV. E
AD7712
CLOCK
GENERATION
SERIAL INTERFACE
OUTPUT
REGISTER
CHARGE-BALANCING A/D
CONVERTER
AUTO-ZEROED
MODULATOR
DIGITAL
FILTER
AD7712
AGND DGND
MODE SDATA SCLK
A0
MCLK OUT
MCLK IN
AIN1(+)
AIN1(–)
REF
IN (–)
REF
IN (+)
SYNC
4.5
m
A
A = 1 – 128
DRDY
TFS
RFS
REF OUT
2.5V REFERENCE
VOLTAGE
ATTENUATION
AIN2
STANDBY
CONTROL
REGISTER
V
SS
500
V
PGA
M
U
X
AV
DD
AV
DD
DV
DD
ANALOG +5V SUPPLY
V
BIAS
4–20mA
LOOP
Figure 21. 4–20 mA Loop Measurement Using the AD7712
APPLICATIONS
4–20 mA LOOP
The AD7712’s high level input can be used to measure the current
in 4–20 mA loop applications as shown in Figure 21. In this
case, the system calibration capabilities of the AD7712 can be
used to remove the offset caused by the 4 mA flowing through
the 500
resistor. The AD7712 can handle an input span as
low as 3.2
×
V
REF
(= 8 V with a V
REF
of +2.5 V) even though the
nominal input voltage range for the input is 10 V. Therefore, the
full span of the A/D converter can be used for measuring the
current between 4 mA and 20 mA.
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