TLV2771CD datasheet(35/54 Pages) TI

35 / 54 page

TLV277x, TLV277xA

FAMILY OF 2.7-V HIGH-SLEW-RATE RAIL-TO-RAIL OUTPUT

OPERATIONAL AMPLIFIERS WITH SHUTDOWN

SLOS209F – JANUARY 1998 – REVISED MARCH 2001

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

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 59. Output Offset Voltage Model

general configurations

When receiving low-level signals, limiting the bandwidth of the incoming signals into the system is often

required. The simplest way to accomplish this is to place an RC filter at the noninverting terminal of the amplifier

(see Figure 60).

–

–3dB +

pR1C1

+ 1 )

) sR1C1

Figure 60. Single-Pole Low-Pass Filter

If even more attenuation is needed, a multiple pole filter is required. The Sallen-Key filter can be used for this

task. For best results, the amplifier should have a bandwidth that is 8 to 10 times the filter frequency bandwidth.

Failure to do this can result in phase shift of the amplifier.

R1 = R2 = R

C1 = C2 = C

Q = Peaking Factor

(Butterworth Q = 0.707)

(

2 –

)

–3dB +

pRC

Figure 61. 2-Pole Low-Pass Sallen-Key Filter

TLV2771CD Datasheet(PDF) 35 Page - Texas Instruments

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