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OPA227 Datasheet(PDF) 13 Page - Texas Instruments

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Part # OPA227
Description  High Precision, Low Noise OPERATIONAL AMPLIFIERS
PDF  27 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

OPA227 Datasheet(HTML) 13 Page - Texas Instruments

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OPA227, 2227, 4227
OPA228, 2228, 4228
13
SBOS110A
www.ti.com
FIGURE 5. Noise Calculation in Gain Configurations.
Where eS = √4kTRS •
= thermal noise of RS
e1 = √4kTR1 •
= thermal noise of R1
e2 = √4kTR2
= thermal noise of R2
1
2
1
+


R
R
Noise at the output:
R
R
2
1


E
R
R
ee
e
i R
e
i R
R
R
On
n
S
n
S
2
2
1
2
2
1
2
2
2
2
2
2
2
2
1
2
11
=+


++
+
() ++
() +


Where eS = √4kTRS •
= thermal noise of RS
e1 = √4kTR1 •
= thermal noise of R1
e2 = √4kTR2
= thermal noise of R2
Noise at the output:
R
RR
S
2
1 +


R
RR
S
2
1 +


E
R
RR
ee
e
i R
e
O
S
nn
S
2
2
1
2
2
1
2
2
2
2
2
2
1
=+
+


++
+
() +
R
1
R
2
E
O
R
1
R
2
E
O
R
S
V
S
R
S
V
S
Noise in Noninverting Gain Configuration
Noise in Inverting Gain Configuration
For the OPA227 and OPA228 series op amps at 1kHz, en = 3nV/√Hz and in = 0.4pA/√Hz.



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