參數(shù)資料
型號: AD7712AR
廠商: Analog Devices Inc
文件頁數(shù): 20/28頁
文件大?。?/td> 0K
描述: IC ADC SIGNAL COND LC2MOS 24SOIC
標準包裝: 1
位數(shù): 24
采樣率(每秒): 1.03k
數(shù)據(jù)接口: 串行
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 45mW
電壓電源: 模擬和數(shù)字,雙 ±
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: 管件
輸入數(shù)目和類型: 1 個單端,單極;1 個差分,單極;1 個差分,雙極
REV. F
AD7712
–27–
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 A
A = 1 – 128
DRDY
TFS
RFS
REF OUT
2.5V REFERENCE
VOLTAGE
ATTENUATION
AIN2
STANDBY
CONTROL
REGISTER
VSS
500
PGA
M
U
X
AVDD
DVDD
ANALOG +5V SUPPLY
VBIAS
4–20mA
LOOP
Figure 20. 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 20. 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
VREF (= 8 V with a VREF 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.
24-Lead Standard Small Outline Package [SOIC]
Wide Body
(RW-24)
Dimensions shown in millimeters and (inches)
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
COMPLIANT TO JEDEC STANDARDS MS-013AD
8
0
0.75 (0.0295)
0.25 (0.0098)
45
1.27 (0.0500)
0.40 (0.0157)
SEATING
PLANE
0.30 (0.0118)
0.10 (0.0039)
2.65 (0.1043)
2.35 (0.0925)
1.27 (0.0500)
BSC
24
13
12
1
10.65 (0.4193)
10.00 (0.3937)
7.60 (0.2992)
7.40 (0.2913)
15.60 (0.6142)
15.20 (0.5984)
COPLANARITY
0.10
0.33 (0.0130)
0.20 (0.0079)
0.51 (0.0201)
0.31 (0.0122)
OUTLINE DIMENSIONS
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