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| OPA197 Datasheet, PDF (30/41 Pages) Texas Instruments – Operational Amplifiers | |||
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OPA197, OPA2197, OPA4197
SBOS737 â JANUARY 2016
www.ti.com
8.2.3 Precision Reference Buffer
The OPAx197 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 56, 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 NŸ
RFx
10 NŸ
CF
39 nF
±
OPA197
+ V+
VREF
VCC
2.5 V
RISO
37.4 Ÿ
VOUT
CL
10 µF
Figure 56. Precision Reference Buffer
30
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Product Folder Links: OPA197 OPA2197 OPA4197
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