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OPAX182 Datasheet(PDF) 24 Page - Texas Instruments

Part # OPAX182
Description  OPAx182 36-V, 5-MHz, Low-Noise, Zero-Drift, MUX-Friendly, Precision Op Amps
PDF  43 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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OPAX182 Datasheet(HTML) 24 Page - Texas Instruments

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9.2.1.2 Detailed Design Procedure
The bridge sensor signal flow model is shown in Figure 9-2.
Figure 9-2. Bridge Sensor Signal Flow Model
The bridge sensor is modeled as a multiplier, with inputs from an excitation voltage and pressure sensor
producing an output voltage given in Equation 1:
bridge
exc
exc
p
V
(P,V
)
V
K (P)
u
(1)
Kp is the sensitivity of the bridge sensor, and is usually specified in mV/V. P represents the pressure relative to
the range of the sensor, normalized to a scale from 0 to 1. Solving this equation with the variables given in the
signal flow model and solving for Vout results in Equation 2:
OS
ref
p
out
lin
p
V
V
G K (P)
V
(P)
1 G K
K (P)
u
u
u
u
(2)
This equation has three variables, VOS, G and Klin, that require three equations to solve. To solve these
equations. values of Kp at no load, midscale and full load conditions are needed for the sensor. With these
values, the system can be linearized.
With known values for Kp, Klin is calculated as shown in Equation 3:
v
ref
lin
out _ high
out _ low
v
out _ high
out _ low
4 B
V
K
(V
V
) 2 B
(V
V
)
u
u
u
u
(3)
In this equation, Bv represents the bridge nonlinearity, which is calculated as shown in Equation 4:
p
p
p
v
p
p
K (1) K (0)
K (0.5)
2
B
K (1) K (0)
(4)
Bv is solved based on the sensor specifications, and the equation is then used to solve for Klin. Next, the system
gain is calculated using Equation 5 and Equation 6.
OS
ref
p
out _ high
lin
p
V
V
G K (1)
V
1 G K
K (1)
u
u
u
u
(5)
OS
ref
p
out _ high
lin
p
V
V
G K (0)
V
1 G K
K (0)
u
u
u
u
(6)
OPA182, OPA2182, OPA4182
SBOS936D – DECEMBER 2019 – REVISED DECEMBER 2021
www.ti.com
24
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Copyright © 2021 Texas Instruments Incorporated
Product Folder Links: OPA182 OPA2182 OPA4182



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