AD8290ACPZ-RL Analog Devices Inc, AD8290ACPZ-RL Datasheet - Page 19

• 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

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 R
specifications of the AD8290 are not exceeded. Sample
calculations are shown in Table 10.
Table 8. PT100 Specifications
RTD Minimum @ 0°C
100 Ω
Table 9. Typical AD8290 Conditions for Temperature Sensor Circuit
Table 10. Temperature Sensor Circuit Calculations Compared to AD8290 Minimum/Maximum Specifications
AD8290 V
3.30 (2.6 to 5.5)
Specification
Supply Current
Current Setting Resistor (R
Minimum Equivalent Resistance to IOUT Pin
Maximum Equivalent Resistance to IOUT Pin
Minimum Voltage @ Current Output Pin (IOUT)
Maximum Voltage @ Current Output Pin (IOUT)
Input Voltage Minimum
Input Voltage Maximum
Output Voltage Minimum
Output Voltage Maximum
CC
G
(V)
such that the minimum and maximum
SET
)
Excitation Current (μA)
300 (300 to 1300)
NC = NO CONNECT
C
0.1µF
BRIDGE
Figure 48. PT100 Temperature Sensor Application Connections
R
3kΩ
R
698Ω
SET
RTD
G
15
13
14
IOUT
VINP
VINN
RSET
NC
11
1
Rev. B | Page 19 of 20
Calculation
1.8
3000
798
836.5
0.239
0.251
0.209
0.251
2.365
3.013
NC
7
RTD Maximum @ 100°C
138.5 Ω
CF1
6
AD8290
NC
C
8
6.8nF
FILTER
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.
NC
9
CF2
Resistor from RTD to GND, R
698
5
NC
12
Unit
mA
Ω
Ω
Ω
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
C1
0.1µF
C2
68nF
3.3V
G
(Ω)
AD8290