參數(shù)資料
型號: AD8290ACPZ-R2
廠商: Analog Devices Inc
文件頁數(shù): 11/20頁
文件大?。?/td> 0K
描述: IC AMP CS CMOS LP 16LFCSP
標準包裝: 250
放大器類型: 電流檢測
電路數(shù): 1
-3db帶寬: 250Hz
電流 - 輸入偏壓: 100pA
電流 - 電源: 1.2mA
電壓 - 電源,單路/雙路(±): 2.6 V ~ 5.5 V,±1.3 V ~ 2.75 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-UFQFN 裸露焊盤,CSP
供應商設備封裝: 16-LFCSP-UQ
包裝: 帶卷 (TR)
AD8290
Rev. B | Page 19 of 20
TEMPERATURE SENSOR APPLICATION
The AD8290 can be used with a temperature sensor. Figure 48
shows the AD8290 in conjunction with an RTD, in this
example, a 2-wire PT100. The specifications for the sensor are
shown in Table 8 and the chosen conditions for the AD8290 are
listed in Table 9.
Once again, care must be taken when picking the excitation
current and RG such that the minimum and maximum
specifications of the AD8290 are not exceeded. Sample
calculations are shown in Table 10.
ADC/MICROCONTROLLER
In both of the previous applications, an ADC or a microcontroller
can be used to follow the AD8290 to convert the output analog
signal to digital. For example, if there are multiple sensors in the
system, the six channel ADuC814ARU microcontoller is an
excellent candidate to interface with multiple AD8290s.
06
74
5-
04
4
ENBL
VOUT
VCC
NC
VINN
VINP
IOUT
RSET
GND
NC
AD8290
NC
16
1
4
3
2
12
9
10
11
14
15
13
CFILTER
6.8nF
C1
0.1F
CF2
CF1
5
6
7
8
C2
68nF
CBRIDGE
0.1F
RSET
3k
RG
698
RTD
3.3V
NC = NO CONNECT
Figure 48. PT100 Temperature Sensor Application Connections
Table 8. PT100 Specifications
RTD Minimum @ 0°C
RTD Maximum @ 100°C
100 Ω
138.5 Ω
Table 9. Typical AD8290 Conditions for Temperature Sensor Circuit
AD8290 VCC (V)
Excitation Current (μA)
Resistor from RTD to GND, RG (Ω)
3.30 (2.6 to 5.5)
300 (300 to 1300)
698
Table 10. Temperature Sensor Circuit Calculations Compared to AD8290 Minimum/Maximum Specifications
Specification
Calculation
Unit
Allowable Range of AD8290
Supply Current
1.8
mA
Current Setting Resistor (RSET)
3000
Ω
692 Ω to 3000 Ω
Minimum Equivalent Resistance to IOUT Pin
798
Ω
Maximum Equivalent Resistance to IOUT Pin
836.5
Ω
Minimum Voltage @ Current Output Pin (IOUT)
0.239
V
>0.0 V
Maximum Voltage @ Current Output Pin (IOUT)
0.251
V
<2.3 V
Input Voltage Minimum
0.209
V
>0.2 V
Input Voltage Maximum
0.251
V
<1.6 V
Output Voltage Minimum
2.365
V
>0.075 V
Output Voltage Maximum
3.013
V
<3.225 V
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