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| OPA192_15 Datasheet, PDF (34/52 Pages) Texas Instruments – OPAx192 36-V, Precision, Rail-to-Rail Input/Output, Low Offset Voltage,Low Input Bias Current Op Amp with e-trim™ | |||
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OPA192, OPA2192, OPA4192
SBOS620D â DECEMBER 2013 â REVISED SEPTEMBER 2015
www.ti.com
9.2.3 Precision Reference Buffer
The OPAx192 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.
RF
1 kÂ
RFx
10 kÂ
CF
39 nF
OPA192
V+
VREF
VCC
2.5 V
RISO
37.4 Â
VOUT
CL
10 µF
Figure 69. Precision Reference Buffer
34
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