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OPA827AI Datasheet(PDF) 13 Page - Texas Instruments

Part # OPA827AI
Description  Low-Noise, High-Precision, JFET-Input OPERATIONAL AMPLIFIER
PDF  24 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

OPA827AI Datasheet(HTML) 13 Page - Texas Instruments

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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:
E
=
O
2
Wheree = Ö
S
4kTR
S
´
=thermalnoiseofR
S
2
1+
R
2
R
1
e
+e
n
1
2
n
2
S
S
+e
+(i R ) +e
+(i
n
R )
2
2
2
2
2
2
1+
R
2
R
1
R
2
R
1
e = Ö
1
4kTR
1
´
=thermalnoiseofR
1
2
1+
R
2
R
1
e = Ö
2
2
4kTR
2 =thermalnoiseofR
Noiseattheoutput:
E
=
O
2
Wheree = Ö
S
4kTR
S
´
=thermalnoiseofR
S
2
1+
R
2
R +R
1
S
e
+e
n
1
2
n
2
S
+e
+(i R ) +e
2
2
2
2
2
R
2
R +R
1
S
R
2
R +R
1
S
e = Ö
1
4kTR
1
´
=thermalnoiseofR
1
e = Ö
2
2
4kTR =thermalnoiseofR
2
FortheOPA827seriesopampsat1kHz,e =4nV/
andi =2.2fA/
.
Ö
Ö
n
Hz
Hz
n
OPA827
www.ti.com ..................................................................................................................................... SBOS376E – NOVEMBER 2006 – REVISED SEPTEMBER 2008
Figure 42 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. The current
output of the amplifier. The equations for total noise
noise of the op amp reacts with the feedback
are shown for both configurations.
resistors to create additional noise components.
Figure 42. Noise Calculation in Gain Configurations
Copyright © 2006–2008, Texas Instruments Incorporated
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Product Folder Link(s): OPA827



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