TLV2780 datasheet(13/44 Pages) TI1

13 / 44 page

TLV2780, TLV2781, TLV2782, TLV2783, TLV2784, TLV2785, TLV278xA

FAMILY OF 1.8 V HIGHSPEED RAILTORAIL INPUT/OUTPUT

OPERATIONAL AMPLIFIERS WITH SHUTDOWN

SLOS245E − MARCH 2000 − REVISED JANUARY 2005

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PARAMETER MEASUREMENT INFORMATION

RNULL

Figure 29

APPLICATION INFORMATION

driving a capacitive load

When the amplifier is configured in this manner, capacitive loading directly on the output will decrease the

device’s phase margin leading to high frequency ringing or oscillations. Therefore, for capacitive loads of greater

than 10 pF, it is recommended that a resistor be placed in series (RNULL) with the output of the amplifier, as

shown in Figure 30.

Input

Output

RNULL

−

Input

Output

RNULL

−

Snubber

(a)

(b)

Figure 30. Driving a Capacitive Load

offset voltage

The output offset voltage, (VOO) is the sum of the input offset voltage (VIO) and both input bias currents (IIB) times

the corresponding gains. The following schematic and formula can be used to calculate the output offset

voltage:

OO +

)

" I

)

" I

IB–

−

IIB−

IIB+

Figure 31. Output Offset Voltage Model

TLV2780 Datasheet(PDF) 13 Page - Texas Instruments