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TLV2785CPWR Datasheet(PDF) 14 Page - Texas Instruments

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Part # TLV2785CPWR
Description  FAMILY OF 1.8V HIGHT-SPEED RAIL-TORAIL INPUT/OUTPUT
PDF  44 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TLV2785CPWR Datasheet(HTML) 14 Page - Texas Instruments

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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
14
WWW.TI.COM
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 32).
VI
VO
C1
+
−
RG
RF
R1
f
–3dB +
1
2
pR1C1
V
O
V
I
+
1
)
R
F
R
G
1
1
) 2pfR1C1
Figure 32. 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 33. 2-Pole Low-Pass Sallen-Key Filter



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