TLV2401, TLV2402, TLV2404

FAMILY OF 880-nA/Ch RAIL-TO-RAIL INPUT/OUTPUT

OPERATIONAL AMPLIFIERS WITH REVERSE BATTERY PROTECTION

SLOS244B – FEBRUARY 2000 – REVISED NOVEMBER 2000

14

POST OFFICE BOX 655303

APPLICATION INFORMATION

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 38).

VI

VO

C1

+

–

RG

RF

R1

f

–3dB +

1

2

pR1C1

V

O

V

I

+ 1 )

R

F

R

G

1

1

) sR1C1

Figure 38. 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.

VI

C2

R2

R1

C1

RF

RG

R1 = R2 = R

C1 = C2 = C

Q = Peaking Factor

(Butterworth Q = 0.707)

(

=

1

Q

2 –

)

RG

RF

_

+

f

–3dB +

1

2

pRC

Figure 39. 2-Pole Low-Pass Sallen-Key Filter