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TLV2455A Datasheet(PDF) 27 Page - Texas Instruments

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Part # TLV2455A
Description  FAMILY OF 23-UA 220-KHZ RAIL TO RAIL INPUT/ OUTPUT OPERATIONAL AMPLIFIERS WITH SHUTDOWN
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TLV2455A Datasheet(HTML) 27 Page - Texas Instruments

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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
WWW.TI.COM
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
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:
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


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