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OPA2228UA/2K5 Datasheet(PDF) 21 Page - Texas Instruments

Part # OPA2228UA/2K5
Description  OPAx227, OPAx228 High-Precision, Low-Noise Operational Amplifiers
PDF  50 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

OPA2228UA/2K5 Datasheet(HTML) 21 Page - Texas Instruments

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Where eS = √4kTRS •
= thermal noise of R
S
= √4kTR1 •
= thermal noise of R1
= √4kTR2
= thermal noise of R2
1
2
1
+
R
R
Noise at the output:
R
R
2
1
E
R
R
e
e
i R
e
i R
R
R
O
n
n
S
n
S
2
2
1
2
2
1
2
2
2
2
2
2
2
2
1
2
1
1
=
+
+
+
+
(
) +
+
(
) +
Where eS = √4kTRS •
= thermal noise of RS
= √4kTR1 •
= thermal noise of R1
= √4kTR2
= thermal noise of R2
Noise at the output:
R
R
RS
2
1 +
R
R
RS
2
1 +
E
R
R
R
e
e
e
i R
e
O
S
n
n
S
2
2
1
2
2
1
2
2
2
2
2
2
1
=
+
+
+
+
+
(
) +
R1
R2
EO
R1
R2
EO
RS
VS
RS
VS
Noise in Noninverting Gain Configuration
Noise in Inverting Gain Configuration
For the OPA227 and OPA228 series op amps at 1kHz, e n = 3nV/√Hz and in = 0.4pA/√Hz.
e
( )
( )
( )
( )
e
1
e2
e
1
e2
(
)
(
)
(
)
Figure 7-5. Noise Calculation in Gain Configurations
www.ti.com
OPA227, OPA2227, OPA4227
OPA228, OPA2228, OPA4228
SBOS110C – MAY 1998 – REVISED MARCH 2023
Copyright © 2023 Texas Instruments Incorporated
Submit Document Feedback
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Product Folder Links: OPA227 OPA2227 OPA4227 OPA228 OPA2228 OPA4228



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