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OPA1644AIDR Datasheet(PDF) 11 Page - Texas Instruments

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Part # OPA1644AIDR
Description  High-Performance, JFET-Input AUDIO OPERATIONAL AMPLIFIERS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

OPA1644AIDR Datasheet(HTML) 11 Page - Texas Instruments

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background image
R
1
R
2
E
O
R
1
R
2
E
O
R
S
V
S
R
S
V
S
A)NoiseinNoninvertingGainConfiguration
B)NoiseinInvertingGainConfiguration
Noiseattheoutput:
Wheree =
S
4kTR
S
4kTR
1
4kTR
2
=thermalnoiseofR
S
=thermalnoiseofR
1
=thermalnoiseofR
2
e =
1
e =
2
Noiseattheoutput:
E
=
O
2
1+
R
2
R +R
1
S
R
2
R +R
1
S
2
2
2
Wheree =
S
4kTR
S
4kTR
1
4kTR
2
=thermalnoiseofR
S
=thermalnoiseofR
1
=thermalnoiseofR
2
e =
1
e =
2
R
2
R +R
1
S
2
1+
R
2
R
1
1+
R
2
R
1
2
R
2
R
1
2
e +e +
1
2
2
2
E
=
O
2
e +
n
2
e
s
2
FortheOPA164xseriesopampsat1kHz,e =5.1nV/ Hz
n
Ö
e +e +
1
2
2
2
e
s
2
e +
n
2
OPA1641
OPA1642
OPA1644
www.ti.com
SBOS484 – DECEMBER 2009
Figure 32 illustrates both noninverting (A) and
The feedback resistor values can generally be
inverting (B) op amp circuit configurations with gain.
chosen to make these noise sources negligible. Note
In circuit configurations with gain, the feedback
that low impedance feedback resistors will load the
network resistors also contribute noise. In general,
output of the amplifier. The equations for total noise
the current noise of the op amp reacts with the
are shown for both configurations.
feedback
resistors
to
create
additional
noise
space
components. However, the extremely low current
noise of the OPA164x means that its current noise
space
contribution can be neglected.
Figure 32. Noise Calculation in Gain Configurations
Copyright © 2009, Texas Instruments Incorporated
11
Product Folder Link(s): OPA1641 OPA1642 OPA1644


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