TLV2450, TLV2451, TLV2452, TLV2453, TLV2454, TLV2455, TLV245xA

FAMILY OF 23 µA 220kHz RAILTORAIL INPUT/OUTPUT

OPERATIONAL AMPLIFIERS WITH SHUTDOWN

SLOS218F − DECEMBER 1998 − REVISED JANUARY 2005

27

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POST OFFICE BOX 1443

APPLICATION INFORMATION

offset voltage

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

voltage:

V

OO +

V

IO

1

)

R

F

R

G

" I

IB

)

R

S

1

)

R

F

R

G

" I

IB

*

R

F

+

−

VI

+

RG

RS

RF

IIB−

VO

IIB+

Figure 50. 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 51).

VI

VO

C1

+

−

RG

RF

R1

V

O

V

I

+

1

)

R

F

R

G

1

1

) sR1C1

f

–3dB +

1

2

pR1C1

Figure 51. 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 52. 2-Pole Low-Pass Sallen-Key Filter