PGA281
SBOS664A –MARCH 2013–REVISED JUNE 2013
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RTD Amplifier
An example of the PGA281 used in an RTD-amplification application is shown in Figure 52. Click the following
link to download the TINA-TI file: PGA281 RTD.
15 V
Out
In
REF5010
Temperat ure
V
at
V
at
V
at
V
at
O U T
O U T
O U T
O U T
1 µF
( èC)
G = ½
G = 1
G = 2
G = 4
- 2 0 0
0
0.03
0.15
0.26
0.06
0.29
0.51
0.11
0.59
1.02
0.22
1.18
R1
4.99 kW
2 0 0
2.04
NOTE: Avoid ground
errors by using a Kelvin
sense connection.
VOP
VOCM
RTD
Pt100
VOUT
PGA281
VON
Figure 52. RTD Amplifier
High-Side Current Sensing
Figure 53 shows an example of how the PGA281 can be used for high-side current sensing. The load current
(ILOAD) creates a voltage drop across the shunt resistor (RSHUNT). This voltage can be amplified or attenuated by
the PGA281. The wide gain options and excellent common-mode rejection of the PGA281 make it ideal for this
type of application. Click the following link to download the TINA-TI file: PGA281 Current Sense.
10 V
+
VOP
VOCM
VON
ILOAD
To ADC or µC
PGA281
100 mꢀ
µC
Load
Figure 53. High-Side Current Sensing
Bridge Amplifier
An example of the PGA281 used in a bridge or strain gauge amplification application is shown in Figure 54. Click
the following link to download the TINA-TI file: PGA281 Bridge Amplifier.
10 V
Bridge
+
VOP
VOCM
PGA281
VON
Figure 54. Programmable Bridge Amplifier
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