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| OPA192 Datasheet, PDF (24/35 Pages) Texas Instruments – High Voltage, Rail-to-Rail Input/Output, Precision Operational Amplifiers, e-trim Series | |||
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OPA192
OPA2192
OPA4192
SBOS620A â DECEMBER 2013 â REVISED JANUARY 2014
www.ti.com
PRECISION REFERENCE BUFFER
The OPA192 features high output current drive capability and low input offset voltage, making it 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 54, 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, while still providing
a loop gain phase margin of 89°. Any other load capacitances require recalculation of the stability components:
RF, RFx, CF, and RISO.
RF
1 kÂ
RFx
10 kÂ
CF
39 nF
VREF
2.5 V
OPA192
V+
VCC
RISO
37.4 Â
VOUT
CL
10 µF
Figure 54. Precision Reference Buffer
24
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Product Folder Links: OPA192 OPA2192 OPA4192
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