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OPA396 Datasheet(PDF) 19 Page - Texas Instruments

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Part # OPA396
Description  OPA396 Precision, Low IQ, Low Input Bias Current Op Amp
PDF  30 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

OPA396 Datasheet(HTML) 19 Page - Texas Instruments

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Then, find the available output swing range greater than the reference voltage available for the measurement:
VSWING = VOUTMAX – VZERO = 2.5 V – 0.3 V = 2.2 V
(4)
where
• VSWING is the expected change in output voltage.
• VOUTMAX is the maximum amplifier output swing.
Finally, calculate the transimpedance resistor (RF) value using the maximum swing and the maximum sensor
current:
RF = VSWING / ISENSMAX = 2.2 V / 20.7 µA = 106.28 kΩ (use 110 kΩ for a common value)
(5)
8.2.1.3 Application Curve
Time (10 ms/div)
0.3 V
2.5 V
20 PA
C012
VTIA
VCE
ISENS
Figure 8-3. Sensor Transient Response to Simulated 300-ppm CO Exposure
www.ti.com
OPA396
SBOSA65 – JULY 2021
Copyright © 2021 Texas Instruments Incorporated
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