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| 型號： | AD8290ACPZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP CS CMOS LP 16LFCSP |
| 標準包裝： | 5,000 |
| 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 18 of 20
PRESSURE SENSOR BRIDGE APPLICATION
Given its excitation current range, the AD8290 provides a good
match with pressure sensor circuits. Two such sensors are the
Fujikura FGN-615PGSR and the Honeywell HPX050AS. Figure 47
shows the AD8290 paired with the Honeywell bridge and the
appropriate connections. In this example, a resistor, RP, is added
to the circuit to ensure that the maximum output voltage of the
AD8290 is not exceeded. Depending on the sensors specifications,
RP may not be necessary.
The specifications for the bridge are show in Table 5 and the
chosen conditions for the AD8290 are listed in Table 6.
Given these specifications, calculations should be made to ensure
that the AD8290 is operating within its required ranges. The
combination of the excitation current and RP must be chosen
to ensure that the conditions stay within the minimum and
maximum specifications of the AD8290. For this example,
because the specifications of the HPX050AS are for a bridge
excitation voltage of 3.0 V, care must be taken to scale the
resulting voltage calculations to the actual bridge voltage. The
required calculations are shown in Table 7.
06
74
5-
0
30
ENBL
VOUT
VCC
NC
VINP
VINN
IOUT
RSET
GND
NC
AD8290
NC
16
1
4
3
2
12
9
10
11
15
14
13
CFILTER
6.8nF
C1
0.1F
CF2
CF1
5
6
7
8
C2
68nF
CBRIDGE
0.1F
RSET
2.7k
RP
2k
3.3V
4
5
6
8
HPX050AS
2
NC = NO CONNECT
Figure 47. HPX050AS Pressure Sensor Application
Table 5. HPX050AS Specifications
Bridge Impedance (Ω)
Rated Offset (mV)
Rated Output Span (mV)
Minimum
Maximum
Minimum
Maximum
Minimum
Maximum
Bridge Excite Voltage (V)
4000
6000
30
+30
0
80
3.0
Table 6. Typical AD8290 Conditions for Pressure Sensor Circuit
AD8290 VCC (V)
Excitation Current (μA)
Parallel Resistor RP (Ω)
3.3 (2.6 to 5.5)
333.3 (300 to 1300)
2000
Table 7. Pressure Sensor Circuit Calculations Compared to AD8290 Minimum/Maximum Specifications
Specification
Calculation
Unit
Allowable Range of AD8290
Supply Current
1.867
mA
Current Setting Resistor (RSET)
2700
Ω
692 Ω to 3000 Ω
Minimum Equivalent Resistance to IOUT Pin
1333
Ω
Maximum Equivalent Resistance to IOUT Pin
1500
Ω
Minimum Current into Bridge
83.333
μA
Maximum Current into Bridge
111.111
μA
Minimum Bridge Midpoint Voltage (Excluding Offset/Span)
0.222
V
Maximum Bridge Midpoint Voltage (Excluding Offset/Span)
0.250
V
Minimum Voltage at Current Output Pin (IOUT)
0.444
V
>0.0 V
Maximum Voltage at Current Output Pin (IOUT)
0.500
V
<2.3 V
Input Voltage Minimum
0.218
V
>0.2 V
Input Voltage Maximum
0.266
V
<1.6 V
Output Voltage Minimum
0.643
V
>0.075 V
Output Voltage Maximum
1.852
V
<3.225 V
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