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OPA192 Datasheet(PDF) 34 Page - Texas Instruments

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Part # OPA192
Description  36-V, Precision, Rail-to-Rail Input/Output, Low-Offset Voltage, Low-Input Bias Current Op Amp With e-trim
PDF  42 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

OPA192 Datasheet(HTML) 34 Page - Texas Instruments

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RF
1 k
Ÿ
CL
10 µF
RISO
37.4
Ÿ
VREF
2.5 V
RFx
10 k
Ÿ
CF
39 nF
V+
VOUT
VCC
OPAx192-Q1
Copyright © 2017, Texas Instruments Incorporated
34
OPA192-Q1, OPA2192-Q1, OPA4192-Q1
SBOS850 – MAY 2017
www.ti.com
Product Folder Links: OPA192-Q1 OPA2192-Q1 OPA4192-Q1
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
9.2.3 Precision Reference Buffer
The OPAx192-Q1 features high output current drive capability and low input offset voltage, making the device an
excellent reference buffer to provide an accurate buffered output with ample drive current for transients. For the
10-µF ceramic capacitor shown in Figure 69, RISO, a 37.4-Ω isolation resistor, provides separation of two
feedback paths for optimal stability. Feedback path number one is through RF and is directly at the output (VOUT).
Feedback path number two is through RFx and CF and is connected at the output of the op amp. The optimized
stability components shown for the 10-µF load give a closed-loop signal bandwidth at VOUT of 4 kHz and still
provides a loop gain phase margin of 89°. Any other load capacitances require recalculation of the stability
components: RF, RFx , CF , and RISO.
Figure 69. Precision Reference Buffer



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