AD8290ACPZ-RL Analog Devices Inc, AD8290ACPZ-RL Datasheet - Page 18

• Manufacturer Part Number: AD8290ACPZ-RL
• Description: IC,Sense Amplifier,SINGLE,CMOS,LLCC,16PIN,PLASTIC
• Manufacturer: Analog Devices Inc

Specifications of AD8290ACPZ-RL

• Amplifier Type: Current Sense
• Number Of Circuits: 1
• -3db Bandwidth: 250Hz
• Current - Input Bias: 100pA
• Current - Supply: 1.2mA
• Voltage - Supply, Single/dual (±): 2.6 V ~ 5.5 V, ±1.3 V ~ 2.75 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-LFCSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Current - Output / Channel: -
• Slew Rate: -
• Gain Bandwidth Product: -
• Voltage - Input Offset: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD8290
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, R
to the circuit to ensure that the maximum output voltage of the
AD8290 is not exceeded. Depending on the sensors specifications,
R
Table 5. HPX050AS Specifications
Minimum
4000
Table 6. Typical AD8290 Conditions for Pressure Sensor Circuit
AD8290 V
3.3 (2.6 to 5.5)
Table 7. Pressure Sensor Circuit Calculations Compared to AD8290 Minimum/Maximum Specifications
Specification
Supply Current
Current Setting Resistor (R
Minimum Equivalent Resistance to IOUT Pin
Maximum Equivalent Resistance to IOUT Pin
Minimum Current into Bridge
Maximum Current into Bridge
Minimum Bridge Midpoint Voltage (Excluding Offset/Span)
Maximum Bridge Midpoint Voltage (Excluding Offset/Span)
Minimum Voltage at Current Output Pin (IOUT)
Maximum Voltage at Current Output Pin (IOUT)
Input Voltage Minimum
Input Voltage Maximum
Output Voltage Minimum
Output Voltage Maximum
P
may not be necessary.
Bridge Impedance (Ω)
CC
(V)
Maximum
6000
NC = NO CONNECT
SET
R
2kΩ
)
P
Minimum
−30
C
0.1µF
BRIDGE
Excitation Current (μA)
333.3 (300 to 1300)
Rated Offset (mV)
2
HPX050AS
Figure 47. HPX050AS Pressure Sensor Application
4
Maximum
+30
8
5
P
, is added
2.7kΩ
R
SET
Rev. B | Page 18 of 20
6
14
15
13
Minimum
0
IOUT
VINN
VINP
RSET
NC
11
1
Rated Output Span (mV)
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 R
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.
Calculation
1.867
2700
1333
83.333
111.111
0.222
0.250
0.444
0.500
0.218
0.266
0.643
1.852
1500
NC
7
CF1
6
AD8290
NC
C
8
6.8nF
FILTER
NC
Maximum
80
9
CF2
5
Parallel Resistor R
2000
NC
12
Unit
mA
Ω
Ω
Ω
μA
μA
V
V
V
V
V
V
V
V
ENBL
VOUT
3
NC
GND
VCC
16
10
2
4
Allowable Range of AD8290
692 Ω to 3000 Ω
>0.0 V
<2.3 V
>0.2 V
<1.6 V
>0.075 V
<3.225 V
Bridge Excite Voltage (V)
3.0
C1
0.1µF
C2
68nF
3.3V
P
(Ω)
P
must be chosen