OPA191IDBVT datasheet(26/57 Pages) TI

Part #	OPA191IDBVT

Description	OPAx191 36-V, Low-Power, Precision, CMOS, Rail-to-Rail Input/Output, Low Offset Voltage, Low Input Bias Current Op Amp

PDF	57 Pages

Scroll/Zoom	100%

Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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26 / 57 page

Input

Output

619

320 pF

Time (2 Ps/Div)

G = +1 V/V

OPA191, OPA2191, OPA4191

SBOS701C – DECEMEBER 2015 – REVISED OCTOBER 2019

www.ti.com

Product Folder Links: OPA191 OPA2191 OPA4191

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8.3.5 Capacitive Load and Stability

The OPAx191 features a patented output stage capable of driving large capacitive loads, and in a unity-gain

configuration, directly drives up to 1 nF of pure capacitive load. Increasing the gain enhances the ability of the

amplifier to drive greater capacitive loads; see Figure 55. The particular op amp circuit configuration, layout, gain,

and output loading are some of the factors to consider when establishing whether an amplifier will be stable in

operation.

Figure 55. Transient Response with a Purely Capacitive Load of 1 nF

Like many low-power amplifiers, some ringing can occur even with capacitive loads less than 100 pF. In unity-

gain configurations with no or very light dc loads, place an RC snubber circuit at the OPAx191 output to reduce

any possibility of ringing in lightly-loaded applications. Figure 56 illustrates the recommended RC snubber circuit.

Figure 56. RC Snubber Circuit for Lightly-Loaded Applications in Unity Gain

OPA191IDBVT Datasheet(PDF) 26 Page - Texas Instruments